diff --git a/py/src/braintrust/integrations/anthropic/_utils.py b/py/src/braintrust/integrations/anthropic/_utils.py
index 29a289b82..12db0e2f2 100644
--- a/py/src/braintrust/integrations/anthropic/_utils.py
+++ b/py/src/braintrust/integrations/anthropic/_utils.py
@@ -53,11 +53,18 @@ def _set_numeric_metric(metrics: dict[str, float], name: str, value: Any) -> Non
         metrics[name] = float(value)
 
 
-def extract_anthropic_usage(usage: Any) -> tuple[dict[str, float], dict[str, Any]]:
+def extract_anthropic_usage(
+    usage: Any,
+    *,
+    include_output: bool = True,
+    include_legacy_cache_creation: bool = True,
+) -> tuple[dict[str, float], dict[str, Any]]:
     """Extract normalized metrics and allowlisted metadata from Anthropic usage.
 
     Numeric usage fields are converted into Braintrust metrics. Allowlisted
     non-numeric fields are attached as span metadata with a ``usage_`` prefix.
+    Anthropic's per-TTL cache creation breakdown supersedes the legacy aggregate
+    metric, and totals are emitted only when completion usage is known.
     """
     usage = _try_to_dict(usage)
     if usage is None:
@@ -66,6 +73,10 @@ def extract_anthropic_usage(usage: Any) -> tuple[dict[str, float], dict[str, Any
     metrics: dict[str, float] = {}
     metadata: dict[str, Any] = {}
     for source_name, metric_name in _ANTHROPIC_USAGE_METRIC_FIELDS:
+        if metric_name == "completion_tokens" and not include_output:
+            continue
+        if metric_name == "prompt_cache_creation_tokens" and not include_legacy_cache_creation:
+            continue
         _set_numeric_metric(metrics, metric_name, usage.get(source_name))
 
     cache_creation = _try_to_dict(usage.get("cache_creation"))
@@ -77,22 +88,36 @@ def extract_anthropic_usage(usage: Any) -> tuple[dict[str, float], dict[str, Any
                 metrics[metric_name] = float(value)
                 cache_creation_breakdown.append(float(value))
 
+    if cache_creation_breakdown:
+        metrics.pop("prompt_cache_creation_tokens", None)
+
     server_tool_use = _try_to_dict(usage.get("server_tool_use"))
     if server_tool_use is not None:
         for source_name, value in server_tool_use.items():
             _set_numeric_metric(metrics, f"server_tool_use_{source_name}", value)
 
-    if "prompt_cache_creation_tokens" not in metrics and cache_creation_breakdown:
-        metrics["prompt_cache_creation_tokens"] = sum(cache_creation_breakdown)
-
-    if metrics:
+    has_prompt_usage = any(
+        metric_name in metrics
+        for metric_name in (
+            "prompt_tokens",
+            "prompt_cached_tokens",
+            "prompt_cache_creation_tokens",
+            "prompt_cache_creation_5m_tokens",
+            "prompt_cache_creation_1h_tokens",
+        )
+    )
+    if has_prompt_usage:
+        effective_cache_creation_tokens = (
+            sum(cache_creation_breakdown)
+            if cache_creation_breakdown
+            else metrics.get("prompt_cache_creation_tokens", 0)
+        )
         total_prompt_tokens = (
-            metrics.get("prompt_tokens", 0)
-            + metrics.get("prompt_cached_tokens", 0)
-            + metrics.get("prompt_cache_creation_tokens", 0)
+            metrics.get("prompt_tokens", 0) + metrics.get("prompt_cached_tokens", 0) + effective_cache_creation_tokens
         )
         metrics["prompt_tokens"] = total_prompt_tokens
-        metrics["tokens"] = total_prompt_tokens + metrics.get("completion_tokens", 0)
+        if "completion_tokens" in metrics:
+            metrics["tokens"] = total_prompt_tokens + metrics["completion_tokens"]
 
     for name, value in usage.items():
         if name in _ANTHROPIC_USAGE_METADATA_FIELDS and value is not None:
diff --git a/py/src/braintrust/integrations/anthropic/test_anthropic.py b/py/src/braintrust/integrations/anthropic/test_anthropic.py
index 7b1c46aa4..576ba4291 100644
--- a/py/src/braintrust/integrations/anthropic/test_anthropic.py
+++ b/py/src/braintrust/integrations/anthropic/test_anthropic.py
@@ -376,7 +376,6 @@ def to_dict(self):
         "prompt_tokens": 21.0,
         "completion_tokens": 7.0,
         "prompt_cached_tokens": 3.0,
-        "prompt_cache_creation_tokens": 7.0,
         "prompt_cache_creation_5m_tokens": 2.0,
         "prompt_cache_creation_1h_tokens": 5.0,
         "server_tool_use_web_search_requests": 2.0,
@@ -410,7 +409,7 @@ def test_anthropic_messages_create_prompt_cache_5m_metrics(memory_logger):
 
     span = find_span_by_name(memory_logger.pop(), "anthropic.messages.create")
     assert span["output"]["role"] == response.role
-    assert span["metrics"]["prompt_cache_creation_tokens"] == response.usage.cache_creation_input_tokens
+    assert "prompt_cache_creation_tokens" not in span["metrics"]
     assert (
         span["metrics"]["prompt_cache_creation_5m_tokens"] == response.usage.cache_creation.ephemeral_5m_input_tokens
     )
@@ -442,7 +441,7 @@ def test_anthropic_messages_create_prompt_cache_1h_metrics(memory_logger):
 
     span = find_span_by_name(memory_logger.pop(), "anthropic.messages.create")
     assert span["output"]["role"] == response.role
-    assert span["metrics"]["prompt_cache_creation_tokens"] == response.usage.cache_creation_input_tokens
+    assert "prompt_cache_creation_tokens" not in span["metrics"]
     assert (
         span["metrics"]["prompt_cache_creation_5m_tokens"] == response.usage.cache_creation.ephemeral_5m_input_tokens
     )
@@ -851,7 +850,7 @@ async def test_anthropic_messages_streaming_async(memory_logger):
     assert metrics["completion_tokens"] == usage.output_tokens
     assert metrics["tokens"] == usage.input_tokens + usage.output_tokens
     assert metrics["prompt_cached_tokens"] == usage.cache_read_input_tokens
-    assert metrics["prompt_cache_creation_tokens"] == usage.cache_creation_input_tokens
+    _assert_cache_creation_metrics(metrics, usage)
     assert log["metadata"]["model"] == MODEL
     assert log["metadata"]["max_tokens"] == 1024
 
@@ -933,7 +932,7 @@ def test_anthropic_messages_streaming_sync(memory_logger):
     assert log["metrics"]["completion_tokens"] == usage.output_tokens
     assert log["metrics"]["tokens"] == usage.input_tokens + usage.output_tokens
     assert log["metrics"]["prompt_cached_tokens"] == usage.cache_read_input_tokens
-    assert log["metrics"]["prompt_cache_creation_tokens"] == usage.cache_creation_input_tokens
+    _assert_cache_creation_metrics(log["metrics"], usage)
 
 
 @pytest.mark.vcr
@@ -973,7 +972,7 @@ def test_anthropic_messages_streaming_sync_text_stream(memory_logger):
     assert log["metrics"]["completion_tokens"] == usage.output_tokens
     assert log["metrics"]["tokens"] == usage.input_tokens + usage.output_tokens
     assert log["metrics"]["prompt_cached_tokens"] == usage.cache_read_input_tokens
-    assert log["metrics"]["prompt_cache_creation_tokens"] == usage.cache_creation_input_tokens
+    _assert_cache_creation_metrics(log["metrics"], usage)
 
 
 @pytest.mark.vcr
@@ -1014,7 +1013,7 @@ async def test_anthropic_messages_streaming_async_text_stream(memory_logger):
     assert log["metrics"]["completion_tokens"] == usage.output_tokens
     assert log["metrics"]["tokens"] == usage.input_tokens + usage.output_tokens
     assert log["metrics"]["prompt_cached_tokens"] == usage.cache_read_input_tokens
-    assert log["metrics"]["prompt_cache_creation_tokens"] == usage.cache_creation_input_tokens
+    _assert_cache_creation_metrics(log["metrics"], usage)
 
 
 @pytest.mark.vcr
@@ -1119,6 +1118,30 @@ def test_anthropic_messages_sync_server_tool_spans(memory_logger):
     assert tool_span["root_span_id"] == llm_span["root_span_id"]
 
 
+def _assert_cache_creation_metrics(metrics, usage):
+    cache_creation = getattr(usage, "cache_creation", None)
+    if cache_creation is None:
+        assert metrics["prompt_cache_creation_tokens"] == usage.cache_creation_input_tokens
+        return
+
+    if isinstance(cache_creation, dict):
+        ephemeral_5m = cache_creation.get("ephemeral_5m_input_tokens")
+        ephemeral_1h = cache_creation.get("ephemeral_1h_input_tokens")
+    else:
+        ephemeral_5m = getattr(cache_creation, "ephemeral_5m_input_tokens", None)
+        ephemeral_1h = getattr(cache_creation, "ephemeral_1h_input_tokens", None)
+
+    if ephemeral_5m is None and ephemeral_1h is None:
+        assert metrics["prompt_cache_creation_tokens"] == usage.cache_creation_input_tokens
+        return
+
+    assert "prompt_cache_creation_tokens" not in metrics
+    if ephemeral_5m is not None:
+        assert metrics["prompt_cache_creation_5m_tokens"] == ephemeral_5m
+    if ephemeral_1h is not None:
+        assert metrics["prompt_cache_creation_1h_tokens"] == ephemeral_1h
+
+
 def _assert_metrics_are_valid(metrics, start, end):
     assert metrics["tokens"] > 0
     assert metrics["prompt_tokens"] > 0
@@ -1467,7 +1490,7 @@ def test_setup_creates_spans(memory_logger):
         usage.input_tokens + usage.cache_read_input_tokens + usage.cache_creation_input_tokens
     )
     assert metrics["completion_tokens"] == usage.output_tokens
-    assert metrics["prompt_cache_creation_tokens"] == usage.cache_creation_input_tokens
+    assert "prompt_cache_creation_tokens" not in metrics
     assert metrics["prompt_cache_creation_5m_tokens"] == ephemeral_5m
     assert metrics["prompt_cache_creation_1h_tokens"] == ephemeral_1h
     assert "service_tier" not in metrics
@@ -1498,7 +1521,7 @@ def test_extract_anthropic_usage_preserves_nested_numeric_fields():
     assert metrics["prompt_tokens"] == 15
     assert metrics["completion_tokens"] == 12
     assert metrics["tokens"] == 27
-    assert metrics["prompt_cache_creation_tokens"] == 7
+    assert "prompt_cache_creation_tokens" not in metrics
     assert metrics["prompt_cache_creation_5m_tokens"] == 3
     assert metrics["prompt_cache_creation_1h_tokens"] == 4
     assert metrics["server_tool_use_web_search_requests"] == 2
diff --git a/py/src/braintrust/integrations/claude_agent_sdk/_test_transport.py b/py/src/braintrust/integrations/claude_agent_sdk/_test_transport.py
index a8bb4d42c..50dda03c1 100644
--- a/py/src/braintrust/integrations/claude_agent_sdk/_test_transport.py
+++ b/py/src/braintrust/integrations/claude_agent_sdk/_test_transport.py
@@ -86,6 +86,8 @@ def _normalize_for_match(value: Any) -> Any:
         return [_normalize_for_match(item) for item in value]
     if isinstance(value, dict):
         normalized = {key: _normalize_for_match(item) for key, item in value.items()}
+        if normalized.get("type") == "user" and isinstance(normalized.get("session_id"), str):
+            normalized["session_id"] = "SESSION_ID"
         if normalized.get("type") == "control_request" and isinstance(normalized.get("request_id"), str):
             normalized["request_id"] = "CONTROL_REQUEST_ID"
         return normalized
@@ -116,8 +118,13 @@ def _compact_initialize_message_for_storage(value: dict[str, Any]) -> dict[str,
         return value
 
     compact_result: dict[str, Any] = {}
-    if "account" in result:
-        compact_result["account"] = result["account"]
+    account = result.get("account")
+    if isinstance(account, dict):
+        compact_result["account"] = {
+            key: account[key]
+            for key in ("apiKeySource", "apiProvider", "subscriptionType", "tokenSource")
+            if key in account
+        }
 
     for key in ("available_output_styles", "commands", "models", "agents"):
         if key in result:
@@ -185,7 +192,7 @@ def _sanitize_url_string(value: str) -> str:
     return urlunsplit((parts.scheme, parts.netloc, parts.path, urlencode(query, doseq=True), parts.fragment))
 
 
-_PATH_RE = re.compile(r"(?:(?:/Users|/home)/[^\s\"']+|[A-Za-z]:\\\\[^\s\"']+)")
+_PATH_RE = re.compile(r"(?:(?:/Users|/home|/private/(?:tmp|var)|/tmp)/[^\s\"']+|[A-Za-z]:\\\\[^\s\"']+)")
 _AUTH_BEARER_RE = re.compile(r"Bearer\s+[A-Za-z0-9._-]+")
 _API_KEY_RE = re.compile(r"\bsk-[A-Za-z0-9_-]+\b")
 _SENSITIVE_FIELDS = {
diff --git a/py/src/braintrust/integrations/claude_agent_sdk/cassettes/0.1.10/test_calculator_with_multiple_operations.json b/py/src/braintrust/integrations/claude_agent_sdk/cassettes/0.1.10/test_calculator_with_multiple_operations.json
index 52a5f76ae..db604ab96 100644
--- a/py/src/braintrust/integrations/claude_agent_sdk/cassettes/0.1.10/test_calculator_with_multiple_operations.json
+++ b/py/src/braintrust/integrations/claude_agent_sdk/cassettes/0.1.10/test_calculator_with_multiple_operations.json
@@ -10,7 +10,7 @@
             "hooks": null,
             "subtype": "initialize"
           },
-          "request_id": "req_1_cd69d436",
+          "request_id": "req_1_311ca38d",
           "type": "control_request"
         }
       }
@@ -35,7 +35,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "3c1926e5-9e80-4dab-893e-d382baf5b819",
+        "request_id": "e7bae3c0-c81e-4311-92c1-0e7b867b8484",
         "type": "control_request"
       }
     },
@@ -45,7 +45,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "3c1926e5-9e80-4dab-893e-d382baf5b819",
+            "request_id": "e7bae3c0-c81e-4311-92c1-0e7b867b8484",
             "response": {
               "mcp_response": {
                 "id": 0,
@@ -72,11 +72,11 @@
       "op": "read",
       "payload": {
         "response": {
-          "request_id": "req_1_cd69d436",
+          "request_id": "req_1_311ca38d",
           "response": {
             "account": {
               "apiKeySource": "ANTHROPIC_API_KEY",
-              "tokenSource": "none"
+              "tokenSource": "claude.ai"
             },
             "available_output_styles": [],
             "commands": [],
@@ -93,7 +93,7 @@
         "kind": "json",
         "value": {
           "message": {
-            "content": "What is 15 multiplied by 7? Then subtract 5 from the result.",
+            "content": "What is 15 multiplied by 7? Then subtract 5 from the result. You must use the calculator MCP tool for both operations in order; do not calculate directly.",
             "role": "user"
           },
           "parent_tool_use_id": null,
@@ -113,7 +113,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "1c8c3717-17c1-4ae3-a2f6-39771f36f18b",
+        "request_id": "767e0d68-191c-4bce-9947-0fffbfe9acb6",
         "type": "control_request"
       }
     },
@@ -123,7 +123,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "1c8c3717-17c1-4ae3-a2f6-39771f36f18b",
+            "request_id": "767e0d68-191c-4bce-9947-0fffbfe9acb6",
             "response": {
               "mcp_response": {
                 "jsonrpc": "2.0",
@@ -156,7 +156,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "2a7e002e-e02d-42a3-a84e-23a41ee500f2",
+        "request_id": "4e62e81f-b8b3-4601-8e81-3f383c7ee668",
         "type": "control_request"
       }
     },
@@ -166,7 +166,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "2a7e002e-e02d-42a3-a84e-23a41ee500f2",
+            "request_id": "4e62e81f-b8b3-4601-8e81-3f383c7ee668",
             "response": {
               "mcp_response": {
                 "id": 0,
@@ -201,7 +201,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "0f03ca4b-ba52-479d-a051-111bba2be5ec",
+        "request_id": "b3b6a787-1af0-48f3-8e8f-ebaa0c132e3b",
         "type": "control_request"
       }
     },
@@ -211,7 +211,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "0f03ca4b-ba52-479d-a051-111bba2be5ec",
+            "request_id": "b3b6a787-1af0-48f3-8e8f-ebaa0c132e3b",
             "response": {
               "mcp_response": {
                 "id": 1,
@@ -271,7 +271,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "cffa2b30-b5c7-4b0e-a883-6b0e69679f3e",
+        "request_id": "f7b1d7ec-c1cf-4435-a23f-c0d1ce0f49d5",
         "type": "control_request"
       }
     },
@@ -281,7 +281,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "cffa2b30-b5c7-4b0e-a883-6b0e69679f3e",
+            "request_id": "f7b1d7ec-c1cf-4435-a23f-c0d1ce0f49d5",
             "response": {
               "mcp_response": {
                 "jsonrpc": "2.0",
@@ -306,7 +306,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "f5c19911-84a8-449e-a861-1698c484e380",
+        "request_id": "2af50c4d-e202-4f4e-adb2-ddb99bb63de0",
         "type": "control_request"
       }
     },
@@ -316,7 +316,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "f5c19911-84a8-449e-a861-1698c484e380",
+            "request_id": "2af50c4d-e202-4f4e-adb2-ddb99bb63de0",
             "response": {
               "mcp_response": {
                 "id": 1,
@@ -387,7 +387,7 @@
         "output_style": "default",
         "permissionMode": "bypassPermissions",
         "plugins": [],
-        "session_id": "6cce7dbe-8a4c-409a-b401-8c36a0e57b66",
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
         "skills": [],
         "slash_commands": [
           "compact",
@@ -422,7 +422,97 @@
           "mcp__calculator__calculator"
         ],
         "type": "system",
-        "uuid": "5aa2f6fd-940e-4953-b97e-7de29a5f79c0"
+        "uuid": "2a0fe665-dd5b-4c08-bb19-b879d071c1ce"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "message": {
+            "content": [
+              {
+                "text": "",
+                "type": "text"
+              }
+            ],
+            "id": "msg_011CduQMCBKLgcbrQXybxWJf",
+            "model": "claude-haiku-4-5-20251001",
+            "role": "assistant",
+            "stop_details": null,
+            "stop_reason": null,
+            "stop_sequence": null,
+            "type": "message",
+            "usage": {
+              "cache_creation": {
+                "ephemeral_1h_input_tokens": 0,
+                "ephemeral_5m_input_tokens": 383
+              },
+              "cache_creation_input_tokens": 383,
+              "cache_read_input_tokens": 13675,
+              "inference_geo": "not_available",
+              "input_tokens": 3,
+              "output_tokens": 2,
+              "service_tier": "standard"
+            }
+          },
+          "type": "message_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "f680095f-f3ae-4c0d-a1d9-dd2c4110cc47"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "content_block": {
+            "text": "",
+            "type": "text"
+          },
+          "index": 0,
+          "type": "content_block_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "38d1d4ca-4e4d-44cc-a1e6-984276d7f33c"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "text": "I'll",
+            "type": "text_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "75c10ba0-835d-4bcb-af86-e3d0fd11ab5d"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "text": " help you calculate this using the calculator tool. Let me start with 15 multiplied by 7.",
+            "type": "text_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "5e8951a3-db31-405b-954b-8d0ca887456e"
       }
     },
     {
@@ -431,12 +521,12 @@
         "message": {
           "content": [
             {
-              "text": "I'll help you with those calculations. Let me start by multiplying 15 by 7, and then I'll subtract 5 from the result.",
+              "text": "I'll help you calculate this using the calculator tool. Let me start with 15 multiplied by 7.",
               "type": "text"
             }
           ],
           "context_management": null,
-          "id": "msg_017ojC4Qh5xsmVhPr8SQ5kWt",
+          "id": "msg_011CduQMCBKLgcbrQXybxWJf",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -446,20 +536,191 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 0
+              "ephemeral_5m_input_tokens": 383
             },
-            "cache_creation_input_tokens": 0,
-            "cache_read_input_tokens": 14015,
+            "cache_creation_input_tokens": 383,
+            "cache_read_input_tokens": 13675,
             "inference_geo": "not_available",
             "input_tokens": 3,
-            "output_tokens": 5,
+            "output_tokens": 2,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "session_id": "6cce7dbe-8a4c-409a-b401-8c36a0e57b66",
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
         "type": "assistant",
-        "uuid": "097e5eee-a4c9-4c7c-9d80-2499b3267a7c"
+        "uuid": "cfcd8cfe-9962-40ad-9745-bf8cd8472cd2"
+      }
+    },
+    {
+      "op": "read",
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@@ -471,7 +732,7 @@
               "caller": {
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-              "id": "toolu_01UYTzcxim9GLCMvGBaNWF7n",
+              "id": "toolu_01FGRwJmZ64RjveiZnvXu6FL",
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@@ -482,7 +743,7 @@
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@@ -492,20 +753,68 @@
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@@ -518,7 +827,7 @@
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@@ -531,7 +840,7 @@
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@@ -541,7 +850,7 @@
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@@ -574,14 +883,14 @@
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@@ -589,7 +898,97 @@
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+            "text": "! Now I'll subtract 5 from that result (105):",
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@@ -598,12 +997,12 @@
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-              "text": "Now let me subtract 5 from that result:",
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@@ -613,20 +1012,208 @@
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@@ -638,7 +1225,7 @@
               "caller": {
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               },
-              "id": "toolu_01GmLKPpMFBaikbxxb1b3jEp",
+              "id": "toolu_019QJe6Zty4sMZTshcsgh86p",
               "input": {
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                 "b": 5,
@@ -649,7 +1236,7 @@
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-          "id": "msg_014Xdi9WBT6VGpsUHF62uocL",
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@@ -659,20 +1246,68 @@
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             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 146
+              "ephemeral_5m_input_tokens": 137
             },
-            "cache_creation_input_tokens": 146,
-            "cache_read_input_tokens": 14015,
+            "cache_creation_input_tokens": 137,
+            "cache_read_input_tokens": 14058,
             "inference_geo": "not_available",
             "input_tokens": 6,
-            "output_tokens": 2,
+            "output_tokens": 106,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "session_id": "6cce7dbe-8a4c-409a-b401-8c36a0e57b66",
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
         "type": "assistant",
-        "uuid": "6f9439e9-bfa1-4ce0-862f-74ee7f2c3acd"
+        "uuid": "25efbce4-d774-4050-855c-9f645dde5120"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "index": 1,
+          "type": "content_block_stop"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "eb7a309d-9f2e-476a-a070-6b72e42f3cbc"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "stop_details": null,
+            "stop_reason": "tool_use",
+            "stop_sequence": null
+          },
+          "type": "message_delta",
+          "usage": {
+            "cache_creation_input_tokens": 137,
+            "cache_read_input_tokens": 14058,
+            "input_tokens": 6,
+            "output_tokens": 106
+          }
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "a547ed22-e8bb-40f3-9f24-a8d126cb1c4b"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "type": "message_stop"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "638dfd79-f92c-461f-9e90-f631cd8019c4"
       }
     },
     {
@@ -685,7 +1320,7 @@
             "method": "tools/call",
             "params": {
               "_meta": {
-                "claudecode/toolUseId": "toolu_01GmLKPpMFBaikbxxb1b3jEp"
+                "claudecode/toolUseId": "toolu_019QJe6Zty4sMZTshcsgh86p"
               },
               "arguments": {
                 "a": 105,
@@ -698,7 +1333,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "e9a6955d-f43f-4df5-94cc-e0622e9dad2c",
+        "request_id": "5a8e069c-6420-489a-bcc2-bdc7969f10fa",
         "type": "control_request"
       }
     },
@@ -708,7 +1343,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "e9a6955d-f43f-4df5-94cc-e0622e9dad2c",
+            "request_id": "5a8e069c-6420-489a-bcc2-bdc7969f10fa",
             "response": {
               "mcp_response": {
                 "id": 3,
@@ -741,14 +1376,14 @@
                   "type": "text"
                 }
               ],
-              "tool_use_id": "toolu_01GmLKPpMFBaikbxxb1b3jEp",
+              "tool_use_id": "toolu_019QJe6Zty4sMZTshcsgh86p",
               "type": "tool_result"
             }
           ],
           "role": "user"
         },
         "parent_tool_use_id": null,
-        "session_id": "6cce7dbe-8a4c-409a-b401-8c36a0e57b66",
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
         "tool_use_result": [
           {
             "text": "The result of subtract(105, 5) is 100",
@@ -756,7 +1391,131 @@
           }
         ],
         "type": "user",
-        "uuid": "32a6d4ee-bd38-4f23-b45f-012a8e110176"
+        "uuid": "48373173-5de7-42a3-9516-93d6f4c83781"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "message": {
+            "content": [
+              {
+                "text": "Perfect! Here's",
+                "type": "text"
+              }
+            ],
+            "id": "msg_011CduQMNd7y6K7bVpZVqccc",
+            "model": "claude-haiku-4-5-20251001",
+            "role": "assistant",
+            "stop_details": null,
+            "stop_reason": null,
+            "stop_sequence": null,
+            "type": "message",
+            "usage": {
+              "cache_creation": {
+                "ephemeral_1h_input_tokens": 0,
+                "ephemeral_5m_input_tokens": 131
+              },
+              "cache_creation_input_tokens": 131,
+              "cache_read_input_tokens": 14195,
+              "inference_geo": "not_available",
+              "input_tokens": 6,
+              "output_tokens": 4,
+              "service_tier": "standard"
+            }
+          },
+          "type": "message_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "13e774e0-6d4e-46b4-8e69-8aae7028e651"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "content_block": {
+            "text": "",
+            "type": "text"
+          },
+          "index": 0,
+          "type": "content_block_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "43a56949-4735-498d-8b9b-6bad0ad545c4"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "text": "Perfect! Here's",
+            "type": "text_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "257b7fe8-b3f4-4678-be2e-86d2a841ce00"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "text": " the",
+            "type": "text_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "bfea0271-4929-43fb-8425-038cbe539b8c"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "text": " step",
+            "type": "text_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "418ccf9f-43e7-4853-90f3-6fe1bc9b6db5"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "text": "-by-step solution:\n\n1. **15 \u00d7 7 = 105**\n2. **105 - 5 = 100**\n\nThe final answer is **100**.",
+            "type": "text_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "9d9f6c42-b85f-4de2-ba12-a2063cee0d01"
       }
     },
     {
@@ -765,77 +1524,125 @@
         "message": {
           "content": [
             {
-              "text": "**The answer is 100.**\n\nHere's the breakdown:\n- 15 \u00d7 7 = 105\n- 105 - 5 = 100",
+              "text": "Perfect! Here's the step-by-step solution:\n\n1. **15 \u00d7 7 = 105**\n2. **105 - 5 = 100**\n\nThe final answer is **100**.",
               "type": "text"
             }
           ],
           "context_management": null,
-          "id": "msg_01TGd8VUAQNNvvYG97ACbhYP",
+          "id": "msg_011CduQMNd7y6K7bVpZVqccc",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
-          "stop_reason": "end_turn",
+          "stop_reason": null,
           "stop_sequence": null,
           "type": "message",
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 273
+              "ephemeral_5m_input_tokens": 131
             },
-            "cache_creation_input_tokens": 273,
-            "cache_read_input_tokens": 14015,
+            "cache_creation_input_tokens": 131,
+            "cache_read_input_tokens": 14195,
             "inference_geo": "not_available",
             "input_tokens": 6,
-            "output_tokens": 40,
+            "output_tokens": 51,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "session_id": "6cce7dbe-8a4c-409a-b401-8c36a0e57b66",
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
         "type": "assistant",
-        "uuid": "d0fbb29e-8bf1-465b-9e90-8758a8a174b9"
+        "uuid": "703782dc-2230-416e-bcea-0ec3752618fa"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "index": 0,
+          "type": "content_block_stop"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "e73c5989-e24a-4d93-9a14-f3d699ab903d"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "stop_details": null,
+            "stop_reason": "end_turn",
+            "stop_sequence": null
+          },
+          "type": "message_delta",
+          "usage": {
+            "cache_creation_input_tokens": 131,
+            "cache_read_input_tokens": 14195,
+            "input_tokens": 6,
+            "output_tokens": 51
+          }
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "6a6eb02e-ae88-423e-bb13-f08084357319"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "type": "message_stop"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
+        "type": "stream_event",
+        "uuid": "54ef02e3-65d4-4974-bed7-4eef11f4288d"
       }
     },
     {
       "op": "read",
       "payload": {
-        "duration_api_ms": 6148,
-        "duration_ms": 3770,
+        "duration_api_ms": 5894,
+        "duration_ms": 6019,
         "is_error": false,
         "modelUsage": {
           "claude-haiku-4-5-20251001": {
-            "cacheCreationInputTokens": 8341,
-            "cacheReadInputTokens": 42045,
+            "cacheCreationInputTokens": 651,
+            "cacheReadInputTokens": 41928,
             "contextWindow": 200000,
-            "costUSD": 0.01654375,
-            "inputTokens": 18,
-            "outputTokens": 379,
+            "costUSD": 0.00820555,
+            "inputTokens": 1099,
+            "outputTokens": 420,
             "webSearchRequests": 0
           }
         },
         "num_turns": 3,
         "permission_denials": [],
-        "result": "**The answer is 100.**\n\nHere's the breakdown:\n- 15 \u00d7 7 = 105\n- 105 - 5 = 100",
-        "session_id": "6cce7dbe-8a4c-409a-b401-8c36a0e57b66",
+        "result": "Perfect! Here's the step-by-step solution:\n\n1. **15 \u00d7 7 = 105**\n2. **105 - 5 = 100**\n\nThe final answer is **100**.",
+        "session_id": "a599f44b-263c-42f3-9573-1ded7b55ca17",
         "subtype": "success",
-        "total_cost_usd": 0.01654375,
+        "total_cost_usd": 0.00820555,
         "type": "result",
         "usage": {
           "cache_creation": {
             "ephemeral_1h_input_tokens": 0,
-            "ephemeral_5m_input_tokens": 419
+            "ephemeral_5m_input_tokens": 651
           },
-          "cache_creation_input_tokens": 419,
-          "cache_read_input_tokens": 42045,
+          "cache_creation_input_tokens": 651,
+          "cache_read_input_tokens": 41928,
           "input_tokens": 15,
-          "output_tokens": 266,
+          "output_tokens": 272,
           "server_tool_use": {
             "web_fetch_requests": 0,
             "web_search_requests": 0
           },
           "service_tier": "standard"
         },
-        "uuid": "d454327a-cc69-4a57-a83c-2285c688110b"
+        "uuid": "01019bae-de3d-4c81-8208-aaf6b4499e86"
       }
     }
   ],
diff --git a/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_calculator_with_multiple_operations.json b/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_calculator_with_multiple_operations.json
index 17756d801..eca0a6c02 100644
--- a/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_calculator_with_multiple_operations.json
+++ b/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_calculator_with_multiple_operations.json
@@ -10,11 +10,40 @@
             "hooks": null,
             "subtype": "initialize"
           },
-          "request_id": "req_1_91cbe10f",
+          "request_id": "req_1_794c4fca",
           "type": "control_request"
         }
       }
     },
+    {
+      "op": "read",
+      "payload": {
+        "hook_event": "SessionStart",
+        "hook_id": "05a1ba74-ad3b-4b34-9e16-d8dbbe9167c6",
+        "hook_name": "SessionStart:startup",
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "hook_started",
+        "type": "system",
+        "uuid": "c0140f79-9c3a-49a8-8ef1-4a640c506632"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "exit_code": 0,
+        "hook_event": "SessionStart",
+        "hook_id": "05a1ba74-ad3b-4b34-9e16-d8dbbe9167c6",
+        "hook_name": "SessionStart:startup",
+        "outcome": "success",
+        "output": "",
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "stderr": "",
+        "stdout": "",
+        "subtype": "hook_response",
+        "type": "system",
+        "uuid": "99fbd7ea-4740-4a2c-8e8a-56658098dedd"
+      }
+    },
     {
       "op": "read",
       "payload": {
@@ -29,7 +58,7 @@
                 "description": "Anthropic's agentic coding tool",
                 "name": "claude-code",
                 "title": "Claude Code",
-                "version": "2.1.142",
+                "version": "2.1.221",
                 "websiteUrl": "https://claude.com/claude-code"
               },
               "protocolVersion": "2025-11-25"
@@ -38,7 +67,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "d753d656-161a-47fc-ac6c-9c8b4bca9012",
+        "request_id": "9f9d12b4-d9cd-41db-bb82-8a4710788d87",
         "type": "control_request"
       }
     },
@@ -48,7 +77,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "d753d656-161a-47fc-ac6c-9c8b4bca9012",
+            "request_id": "9f9d12b4-d9cd-41db-bb82-8a4710788d87",
             "response": {
               "mcp_response": {
                 "id": 0,
@@ -75,12 +104,12 @@
       "op": "read",
       "payload": {
         "response": {
-          "request_id": "req_1_91cbe10f",
+          "request_id": "req_1_794c4fca",
           "response": {
             "account": {
               "apiKeySource": "ANTHROPIC_API_KEY",
               "apiProvider": "firstParty",
-              "tokenSource": "none"
+              "tokenSource": "claude.ai"
             },
             "agents": [],
             "available_output_styles": [],
@@ -98,7 +127,7 @@
         "kind": "json",
         "value": {
           "message": {
-            "content": "What is 15 multiplied by 7? Then subtract 5 from the result.",
+            "content": "What is 15 multiplied by 7? Then subtract 5 from the result. You must use the calculator MCP tool for both operations in order; do not calculate directly.",
             "role": "user"
           },
           "parent_tool_use_id": null,
@@ -118,7 +147,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "c3a54215-23ed-47a6-865e-29f8f069e3c4",
+        "request_id": "d63c1596-7777-4da7-a7cb-cc3495765b1c",
         "type": "control_request"
       }
     },
@@ -128,7 +157,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "c3a54215-23ed-47a6-865e-29f8f069e3c4",
+            "request_id": "d63c1596-7777-4da7-a7cb-cc3495765b1c",
             "response": {
               "mcp_response": {
                 "jsonrpc": "2.0",
@@ -141,62 +170,6 @@
         }
       }
     },
-    {
-      "op": "read",
-      "payload": {
-        "request": {
-          "message": {
-            "id": 0,
-            "jsonrpc": "2.0",
-            "method": "initialize",
-            "params": {
-              "capabilities": {},
-              "clientInfo": {
-                "description": "Anthropic's agentic coding tool",
-                "name": "claude-code",
-                "title": "Claude Code",
-                "version": "2.1.142",
-                "websiteUrl": "https://claude.com/claude-code"
-              },
-              "protocolVersion": "2025-11-25"
-            }
-          },
-          "server_name": "calculator",
-          "subtype": "mcp_message"
-        },
-        "request_id": "f82268a6-bd01-41dc-aab9-14c0a8a9977b",
-        "type": "control_request"
-      }
-    },
-    {
-      "op": "write",
-      "payload": {
-        "kind": "json",
-        "value": {
-          "response": {
-            "request_id": "f82268a6-bd01-41dc-aab9-14c0a8a9977b",
-            "response": {
-              "mcp_response": {
-                "id": 0,
-                "jsonrpc": "2.0",
-                "result": {
-                  "capabilities": {
-                    "tools": {}
-                  },
-                  "protocolVersion": "2024-11-05",
-                  "serverInfo": {
-                    "name": "calculator",
-                    "version": "1.0.0"
-                  }
-                }
-              }
-            },
-            "subtype": "success"
-          },
-          "type": "control_response"
-        }
-      }
-    },
     {
       "op": "read",
       "payload": {
@@ -209,7 +182,7 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "d8fbcfa4-d04e-45d6-a393-07d6e0b02b8c",
+        "request_id": "4d80ea33-22c0-4440-84c5-d65239844f09",
         "type": "control_request"
       }
     },
@@ -219,7 +192,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "d8fbcfa4-d04e-45d6-a393-07d6e0b02b8c",
+            "request_id": "4d80ea33-22c0-4440-84c5-d65239844f09",
             "response": {
               "mcp_response": {
                 "id": 1,
@@ -268,40 +241,6 @@
         }
       }
     },
-    {
-      "op": "read",
-      "payload": {
-        "request": {
-          "message": {
-            "jsonrpc": "2.0",
-            "method": "notifications/initialized"
-          },
-          "server_name": "calculator",
-          "subtype": "mcp_message"
-        },
-        "request_id": "17eeac60-91df-4fd0-9328-41962c081c53",
-        "type": "control_request"
-      }
-    },
-    {
-      "op": "write",
-      "payload": {
-        "kind": "json",
-        "value": {
-          "response": {
-            "request_id": "17eeac60-91df-4fd0-9328-41962c081c53",
-            "response": {
-              "mcp_response": {
-                "jsonrpc": "2.0",
-                "result": {}
-              }
-            },
-            "subtype": "success"
-          },
-          "type": "control_response"
-        }
-      }
-    },
     {
       "op": "read",
       "payload": {
@@ -314,14 +253,16 @@
         ],
         "analytics_disabled": false,
         "apiKeySource": "ANTHROPIC_API_KEY",
-        "claude_code_version": "2.1.142",
+        "capabilities": [
+          "interrupt_receipt_v1",
+          "interrupt_cancel_queued_v1",
+          "msg_lifecycle_v1"
+        ],
+        "claude_code_version": "2.1.221",
         "cwd": "<REDACTED_CWD>",
+        "fast_mode_disabled_reason": "sdk_opt_in_required",
         "fast_mode_state": "off",
         "mcp_servers": [
-          {
-            "name": "braintrust",
-            "status": "connected"
-          },
           {
             "name": "linear-server",
             "status": "connected"
@@ -341,78 +282,107 @@
           {
             "name": "rust-analyzer-lsp",
             "path": "<REDACTED_PATH>",
-            "source": "rust-analyzer-lsp@claude-plugins-official"
+            "source": "rust-analyzer-lsp@claude-plugins-official",
+            "version": "1.0.0"
           }
         ],
-        "session_id": "bb4c779d-c1e5-47ef-a8f4-c29a8a4e7653",
+        "product_feedback_disabled": false,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
         "skills": [
-          "create-braintrust-demo",
           "braintrust",
+          "create-braintrust-demo",
+          "commit-message",
+          "sdk-benchmarking",
+          "sdk-ci-triage",
           "sdk-dependency-updates",
           "sdk-integrations",
           "sdk-vcr-workflows",
-          "sdk-ci-triage",
-          "commit-message",
-          "sdk-benchmarking",
+          "design-sync",
+          "dataviz",
           "update-config",
+          "verify",
           "debug",
+          "code-review",
           "simplify",
           "batch",
           "fewer-permission-prompts",
+          "doctor",
           "loop",
-          "claude-api"
+          "claude-api",
+          "run",
+          "run-skill-generator"
         ],
         "slash_commands": [
-          "create-braintrust-demo",
           "braintrust",
+          "create-braintrust-demo",
+          "commit-message",
+          "sdk-benchmarking",
+          "sdk-ci-triage",
           "sdk-dependency-updates",
           "sdk-integrations",
           "sdk-vcr-workflows",
-          "sdk-ci-triage",
-          "commit-message",
-          "sdk-benchmarking",
+          "design-sync",
+          "dataviz",
           "update-config",
+          "verify",
           "debug",
+          "code-review",
           "simplify",
           "batch",
           "fewer-permission-prompts",
+          "doctor",
           "loop",
           "claude-api",
+          "run",
+          "run-skill-generator",
+          "agents",
+          "autocompact",
           "clear",
+          "color",
           "compact",
+          "config",
           "context",
+          "effort",
+          "fast",
           "heapdump",
           "init",
+          "mcp",
+          "import",
+          "model",
+          "__remote-workflow",
+          "workflow-launch-exec",
+          "reload-skills",
+          "rename",
           "review",
           "security-review",
           "usage",
           "insights",
+          "recap",
           "goal",
+          "design",
+          "design-consent",
+          "design-revoke",
           "team-onboarding"
         ],
         "subtype": "init",
         "tools": [
           "Task",
-          "AskUserQuestion",
           "Bash",
           "CronCreate",
           "CronDelete",
           "CronList",
+          "DesignSync",
           "Edit",
-          "EnterPlanMode",
           "EnterWorktree",
-          "ExitPlanMode",
           "ExitWorktree",
-          "Glob",
-          "Grep",
-          "ListMcpResourcesTool",
           "LSP",
           "Monitor",
           "NotebookEdit",
           "PushNotification",
           "Read",
-          "ReadMcpResourceTool",
+          "ReportFindings",
           "ScheduleWakeup",
+          "SendMessage",
           "Skill",
           "TaskCreate",
           "TaskGet",
@@ -424,23 +394,19 @@
           "WebFetch",
           "WebSearch",
           "Write",
-          "mcp__braintrust__generate_permalink",
-          "mcp__braintrust__infer_schema",
-          "mcp__braintrust__list_recent_objects",
-          "mcp__braintrust__resolve_object",
-          "mcp__braintrust__search_docs",
-          "mcp__braintrust__sql_query",
-          "mcp__braintrust__summarize_experiment",
           "mcp__calculator__calculator",
           "mcp__linear-server__create_attachment",
           "mcp__linear-server__create_attachment_from_upload",
+          "mcp__linear-server__create_initiative_label",
           "mcp__linear-server__create_issue_label",
           "mcp__linear-server__delete_attachment",
           "mcp__linear-server__delete_comment",
           "mcp__linear-server__delete_customer",
           "mcp__linear-server__delete_customer_need",
+          "mcp__linear-server__delete_diff_comment",
           "mcp__linear-server__delete_status_update",
           "mcp__linear-server__extract_images",
+          "mcp__linear-server__get_agent_skill",
           "mcp__linear-server__get_attachment",
           "mcp__linear-server__get_diff",
           "mcp__linear-server__get_diff_threads",
@@ -450,14 +416,19 @@
           "mcp__linear-server__get_issue_status",
           "mcp__linear-server__get_milestone",
           "mcp__linear-server__get_project",
+          "mcp__linear-server__get_release",
+          "mcp__linear-server__get_release_note",
           "mcp__linear-server__get_status_updates",
           "mcp__linear-server__get_team",
           "mcp__linear-server__get_user",
+          "mcp__linear-server__get_workspace",
+          "mcp__linear-server__list_agent_skills",
           "mcp__linear-server__list_comments",
           "mcp__linear-server__list_customers",
           "mcp__linear-server__list_cycles",
           "mcp__linear-server__list_diffs",
           "mcp__linear-server__list_documents",
+          "mcp__linear-server__list_initiative_labels",
           "mcp__linear-server__list_initiatives",
           "mcp__linear-server__list_issue_labels",
           "mcp__linear-server__list_issue_statuses",
@@ -465,22 +436,257 @@
           "mcp__linear-server__list_milestones",
           "mcp__linear-server__list_project_labels",
           "mcp__linear-server__list_projects",
+          "mcp__linear-server__list_release_notes",
+          "mcp__linear-server__list_release_pipelines",
+          "mcp__linear-server__list_releases",
           "mcp__linear-server__list_teams",
           "mcp__linear-server__list_users",
+          "mcp__linear-server__merge_diff",
           "mcp__linear-server__prepare_attachment_upload",
+          "mcp__linear-server__resolve_diff_thread",
           "mcp__linear-server__save_comment",
           "mcp__linear-server__save_customer",
           "mcp__linear-server__save_customer_need",
+          "mcp__linear-server__save_diff_comment",
           "mcp__linear-server__save_document",
           "mcp__linear-server__save_initiative",
           "mcp__linear-server__save_issue",
           "mcp__linear-server__save_milestone",
           "mcp__linear-server__save_project",
+          "mcp__linear-server__save_release",
+          "mcp__linear-server__save_release_note",
           "mcp__linear-server__save_status_update",
-          "mcp__linear-server__search_documentation"
+          "mcp__linear-server__search_documentation",
+          "mcp__linear-server__submit_diff_review"
         ],
         "type": "system",
-        "uuid": "3f6cb2af-f837-4c20-9c65-d3533b01be5f"
+        "uuid": "32015a3b-3d26-45d7-a838-2540b983c020"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "status": "requesting",
+        "subtype": "status",
+        "type": "system",
+        "uuid": "8d6bdf95-0c47-42dd-b8da-a9cfcb785a34"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "message": {
+            "content": [],
+            "diagnostics": null,
+            "id": "msg_011CduQFwRB6kQFY7QFEMHPW",
+            "model": "claude-haiku-4-5-20251001",
+            "role": "assistant",
+            "stop_details": null,
+            "stop_reason": null,
+            "stop_sequence": null,
+            "type": "message",
+            "usage": {
+              "cache_creation": {
+                "ephemeral_1h_input_tokens": 0,
+                "ephemeral_5m_input_tokens": 7968
+              },
+              "cache_creation_input_tokens": 7968,
+              "cache_read_input_tokens": 9310,
+              "inference_geo": "not_available",
+              "input_tokens": 10,
+              "output_tokens": 3,
+              "service_tier": "standard"
+            }
+          },
+          "type": "message_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "ttft_ms": 816,
+        "type": "stream_event",
+        "uuid": "3e953d71-4588-4419-be70-564bdc20ec4f"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "content_block": {
+            "signature": "<REDACTED_SIGNATURE>",
+            "thinking": "",
+            "type": "thinking"
+          },
+          "index": 0,
+          "type": "content_block_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "a88bc887-6945-4f4d-8fca-2da2e63c84ab"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 4,
+        "estimated_tokens_delta": 4,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "01b3a4cc-d953-4206-9a19-3a7288b4b145"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "estimated_tokens": null,
+            "thinking": "The user wants",
+            "type": "thinking_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "a530b614-2d2b-4d60-b814-b28f5a889336"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 6,
+        "estimated_tokens_delta": 2,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "6de4f574-ebc4-4471-b1cc-bcbcd5722091"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "estimated_tokens": null,
+            "thinking": " me to:",
+            "type": "thinking_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "2a9d62ef-d3e8-4b6e-aaee-986a5d608659"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 45,
+        "estimated_tokens_delta": 39,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "9d47372a-6441-4f73-8064-b490f708755c"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "estimated_tokens": null,
+            "thinking": "\n1. Multiply 15 by 7 using the calculator MCP tool\n2. Subtract 5 from the result using the calculator MCP tool\n3. I should use the tool for both operations,",
+            "type": "thinking_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "8b25aac8-1136-4689-9f04-1d7f4ad59fd1"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 78,
+        "estimated_tokens_delta": 33,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "73c00dd4-7ac2-4ff9-a3ed-0b39aa100e0b"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "estimated_tokens": null,
+            "thinking": " not calculate directly\n\nFirst, I need to load the calculator tool schema using ToolSearch since it's in the deferred tools list.",
+            "type": "thinking_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "7817d2f5-ee20-440c-a4aa-96d50b9e0e79"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "estimated_tokens": null,
+            "thinking": "",
+            "type": "thinking_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "684398ad-9f77-4665-9e02-9e0a5522dc3b"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 140,
+        "estimated_tokens_delta": 62,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "ff3b2ffc-ed62-4aba-9286-e01dce30ca46"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "signature": "<REDACTED_SIGNATURE>",
+            "type": "signature_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "853d12ad-c026-4c4a-bfd5-3eea031633c6"
       }
     },
     {
@@ -490,13 +696,13 @@
           "content": [
             {
               "signature": "<REDACTED_SIGNATURE>",
-              "thinking": "The user is asking me to:\n1. Calculate 15 multiplied by 7\n2. Subtract 5 from the result\n\nI have a calculator tool available (mcp__calculator__calculator) that can help with this. Let me use it.\n\nFirst, I'll multiply 15 by 7:\n15 * 7 = 105\n\nThen I'll subtract 5 from 105:\n105 - 5 = 100\n\nLet me use the calculator tool to do this.",
+              "thinking": "The user wants me to:\n1. Multiply 15 by 7 using the calculator MCP tool\n2. Subtract 5 from the result using the calculator MCP tool\n3. I should use the tool for both operations, not calculate directly\n\nFirst, I need to load the calculator tool schema using ToolSearch since it's in the deferred tools list.",
               "type": "thinking"
             }
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01DwPD3GgcGBZcg5NdzSNXsU",
+          "id": "msg_011CduQFwRB6kQFY7QFEMHPW",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -506,82 +712,785 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 44678
+              "ephemeral_5m_input_tokens": 7968
             },
-            "cache_creation_input_tokens": 44678,
-            "cache_read_input_tokens": 0,
+            "cache_creation_input_tokens": 7968,
+            "cache_read_input_tokens": 9310,
             "inference_geo": "not_available",
             "input_tokens": 10,
-            "output_tokens": 7,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7Voev5n1eRQF6cEwLi",
-        "session_id": "bb4c779d-c1e5-47ef-a8f4-c29a8a4e7653",
+        "request_id": "req_011CduQFvvekwx92jXZasRZd",
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "timestamp": "2026-08-10T16:42:24.845Z",
         "type": "assistant",
-        "uuid": "e5f9f36e-a79f-43e3-b661-4c5986930b41"
+        "uuid": "5409dfb1-af92-4059-a056-ddec102a84b7"
       }
     },
     {
       "op": "read",
       "payload": {
-        "message": {
-          "content": [
-            {
-              "caller": {
-                "type": "direct"
-              },
-              "id": "toolu_01LpaCWLeKNFQ8yoWYMEjid1",
-              "input": {
-                "a": 15,
-                "b": 7,
-                "operation": "multiply"
-              },
-              "name": "mcp__calculator__calculator",
-              "type": "tool_use"
-            }
-          ],
-          "context_management": null,
-          "diagnostics": null,
-          "id": "msg_01DwPD3GgcGBZcg5NdzSNXsU",
-          "model": "claude-haiku-4-5-20251001",
-          "role": "assistant",
-          "stop_details": null,
-          "stop_reason": null,
-          "stop_sequence": null,
-          "type": "message",
-          "usage": {
-            "cache_creation": {
-              "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 44678
-            },
-            "cache_creation_input_tokens": 44678,
-            "cache_read_input_tokens": 0,
-            "inference_geo": "not_available",
-            "input_tokens": 10,
-            "output_tokens": 7,
-            "service_tier": "standard"
-          }
+        "event": {
+          "index": 0,
+          "type": "content_block_stop"
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7Voev5n1eRQF6cEwLi",
-        "session_id": "bb4c779d-c1e5-47ef-a8f4-c29a8a4e7653",
-        "type": "assistant",
-        "uuid": "a31d2a29-2c3d-46a5-a359-fffe0f07333e"
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "eb5fc07e-59c3-4edc-9e5c-6cbfa9966aa5"
       }
     },
     {
       "op": "read",
       "payload": {
-        "request": {
+        "event": {
+          "content_block": {
+            "text": "",
+            "type": "text"
+          },
+          "index": 1,
+          "type": "content_block_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "56a7ff73-c13a-41b7-b7fe-31f1e1817777"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "text": "I'll use the calculator MCP tool to perform these operations. First, let me load the tool schema.",
+            "type": "text_delta"
+          },
+          "index": 1,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "741334b2-1547-4c70-a7be-7af4a5e4a374"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "text": "I'll use the calculator MCP tool to perform these operations. First, let me load the tool schema.",
+              "type": "text"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduQFwRB6kQFY7QFEMHPW",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 7968
+            },
+            "cache_creation_input_tokens": 7968,
+            "cache_read_input_tokens": 9310,
+            "inference_geo": "not_available",
+            "input_tokens": 10,
+            "output_tokens": 3,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": null,
+        "request_id": "req_011CduQFvvekwx92jXZasRZd",
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "timestamp": "2026-08-10T16:42:24.849Z",
+        "type": "assistant",
+        "uuid": "f0443f52-e96a-4855-8cf9-4349dcc2a262"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "index": 1,
+          "type": "content_block_stop"
+        },
+        "parent_tool_use_id": null,
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               "_meta": {
-                "claudecode/toolUseId": "toolu_01LpaCWLeKNFQ8yoWYMEjid1",
+                "claudecode/toolUseId": "toolu_0111F8QYQdeiTkpRGntVoBsk",
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               },
               "arguments": {
@@ -595,66 +1504,444 @@
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-        "request_id": "9aaa0bf1-3ff0-42e9-abc2-fb668f1f26da",
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+                "jsonrpc": "2.0",
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+                      "type": "text"
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+                }
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+                  "text": "The result of multiply(15, 7) is 105",
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+            "thinking": "Great! ",
+            "type": "thinking_delta"
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+            "thinking": "15 \u00d7 7 = 105. Now I need to subtract 5 from 105.",
+            "type": "thinking_delta"
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+              "thinking": "Great! 15 \u00d7 7 = 105. Now I need to subtract 5 from 105.",
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-                      "text": "The result of multiply(15, 7) is 105",
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-                  ]
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+        "event": {
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             },
-            "subtype": "success"
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-        "type": "user",
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+    {
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+            "type": "input_json_delta"
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+          "index": 1,
+          "type": "content_block_delta"
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+    {
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+      "payload": {
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+            "type": "input_json_delta"
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+          "index": 1,
+          "type": "content_block_delta"
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+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
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+    {
+      "op": "read",
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+            "type": "input_json_delta"
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+          "index": 1,
+          "type": "content_block_delta"
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+        "parent_tool_use_id": null,
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+    {
+      "op": "read",
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+            "type": "input_json_delta"
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+          "index": 1,
+          "type": "content_block_delta"
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+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
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     {
@@ -666,7 +1953,7 @@
               "caller": {
                 "type": "direct"
               },
-              "id": "toolu_01U4sNYME2jBLMUUZ6TvtJEF",
+              "id": "toolu_012zmqkutjE5saqvVoGSY7ux",
               "input": {
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                 "b": 5,
@@ -678,7 +1965,7 @@
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01DwPD3GgcGBZcg5NdzSNXsU",
+          "id": "msg_011CduQGEByr7wexPetXQzBy",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
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@@ -688,21 +1975,29 @@
           "usage": {
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-              "ephemeral_5m_input_tokens": 44678
+              "ephemeral_5m_input_tokens": 180
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             "inference_geo": "not_available",
-            "input_tokens": 10,
-            "output_tokens": 7,
+            "input_tokens": 8,
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             "service_tier": "standard"
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-        "request_id": "req_011CbC7Voev5n1eRQF6cEwLi",
-        "session_id": "bb4c779d-c1e5-47ef-a8f4-c29a8a4e7653",
+        "request_id": "req_011CduQGDU56gpe4GQ6gNg9W",
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "timestamp": "2026-08-10T16:42:28.175Z",
+        "tool_use_meta": [
+          {
+            "display_name": "Calculator",
+            "id": "toolu_012zmqkutjE5saqvVoGSY7ux",
+            "server_display_name": "calculator"
+          }
+        ],
         "type": "assistant",
-        "uuid": "a1e7184e-f26d-4e83-b6fc-7e58da27a09a"
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     {
@@ -715,7 +2010,7 @@
             "method": "tools/call",
             "params": {
               "_meta": {
-                "claudecode/toolUseId": "toolu_01U4sNYME2jBLMUUZ6TvtJEF",
+                "claudecode/toolUseId": "toolu_012zmqkutjE5saqvVoGSY7ux",
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               },
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@@ -729,17 +2024,30 @@
           "server_name": "calculator",
           "subtype": "mcp_message"
         },
-        "request_id": "463385a9-9b81-4699-9927-ba68cc9fd6b7",
+        "request_id": "4569a707-fb5b-4ea3-b98a-58fa86247e55",
         "type": "control_request"
       }
     },
+    {
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+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
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     {
       "op": "write",
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+            "request_id": "4569a707-fb5b-4ea3-b98a-58fa86247e55",
             "response": {
               "mcp_response": {
                 "id": 3,
@@ -760,6 +2068,60 @@
         }
       }
     },
+    {
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+                "type": "message"
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+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "a1467955-83cb-4a9b-bc92-fb3f4b4cfe3a"
+      }
+    },
+    {
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+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
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+        "uuid": "64e4b58c-7d48-4734-aba1-b707be5a586d"
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@@ -772,15 +2134,15 @@
                   "type": "text"
                 }
               ],
-              "tool_use_id": "toolu_01U4sNYME2jBLMUUZ6TvtJEF",
+              "tool_use_id": "toolu_012zmqkutjE5saqvVoGSY7ux",
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         },
         "parent_tool_use_id": null,
-        "session_id": "bb4c779d-c1e5-47ef-a8f4-c29a8a4e7653",
-        "timestamp": "2026-05-19T14:49:21.932Z",
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "timestamp": "2026-08-10T16:42:28.369Z",
         "tool_use_result": [
           {
             "text": "The result of subtract(105, 5) is 100",
@@ -788,7 +2150,186 @@
           }
         ],
         "type": "user",
-        "uuid": "a46afcd5-6f13-4214-8606-956d47d0ec17"
+        "uuid": "691fdbf0-caeb-4986-ad50-d78682902591"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "status": "requesting",
+        "subtype": "status",
+        "type": "system",
+        "uuid": "877c6ec9-b329-40d1-9304-38479e47299c"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "message": {
+            "content": [],
+            "diagnostics": null,
+            "id": "msg_011CduQGKpK8BTWTkAWknSwM",
+            "model": "claude-haiku-4-5-20251001",
+            "role": "assistant",
+            "stop_details": null,
+            "stop_reason": null,
+            "stop_sequence": null,
+            "type": "message",
+            "usage": {
+              "cache_creation": {
+                "ephemeral_1h_input_tokens": 0,
+                "ephemeral_5m_input_tokens": 155
+              },
+              "cache_creation_input_tokens": 155,
+              "cache_read_input_tokens": 17806,
+              "inference_geo": "not_available",
+              "input_tokens": 8,
+              "output_tokens": 3,
+              "service_tier": "standard"
+            }
+          },
+          "type": "message_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "ttft_ms": 584,
+        "type": "stream_event",
+        "uuid": "3c255cfa-119c-4e69-b3ed-b89db0748904"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "content_block": {
+            "signature": "<REDACTED_SIGNATURE>",
+            "thinking": "",
+            "type": "thinking"
+          },
+          "index": 0,
+          "type": "content_block_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "ba0159d5-9fe7-48d3-ba8a-ca192eec81aa"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 3,
+        "estimated_tokens_delta": 3,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "1521c929-8893-4889-bf95-be82dd5f4b62"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "estimated_tokens": null,
+            "thinking": "Perfect! The",
+            "type": "thinking_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "31b1fac0-fb16-4d56-8c32-a90e25a0e82e"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 6,
+        "estimated_tokens_delta": 3,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "c329c4ec-0000-4256-b40a-ee24ba1733dd"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "estimated_tokens": null,
+            "thinking": " calculator",
+            "type": "thinking_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "c0acc88a-0ccc-4dd4-9f5a-b4e2c78d159d"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 29,
+        "estimated_tokens_delta": 23,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "c939db1c-079b-4983-a29f-404e65cc7ad5"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "estimated_tokens": null,
+            "thinking": " tool performed both operations:\n1. 15 \u00d7 7 = 105\n2. 105 - 5 = 100\n\nThe final answer is 100.",
+            "type": "thinking_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "5894b5d8-7eec-409d-99b0-b931d8c79d0e"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 93,
+        "estimated_tokens_delta": 64,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "e7109084-6bcd-43f3-89aa-1fa347ca969c"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "signature": "<REDACTED_SIGNATURE>",
+            "type": "signature_delta"
+          },
+          "index": 0,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "b7e5f969-2638-41dd-b537-eb8ca8ec245f"
       }
     },
     {
@@ -798,13 +2339,13 @@
           "content": [
             {
               "signature": "<REDACTED_SIGNATURE>",
-              "thinking": "Great! The calculations are done:\n- 15 \u00d7 7 = 105\n- 105 - 5 = 100\n\nSo the final answer is 100.",
+              "thinking": "Perfect! The calculator tool performed both operations:\n1. 15 \u00d7 7 = 105\n2. 105 - 5 = 100\n\nThe final answer is 100.",
               "type": "thinking"
             }
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01BLdFiureh3DEprWKdGE6fx",
+          "id": "msg_011CduQGKpK8BTWTkAWknSwM",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -814,21 +2355,86 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 386
+              "ephemeral_5m_input_tokens": 155
             },
-            "cache_creation_input_tokens": 386,
-            "cache_read_input_tokens": 44678,
+            "cache_creation_input_tokens": 155,
+            "cache_read_input_tokens": 17806,
             "inference_geo": "not_available",
             "input_tokens": 8,
-            "output_tokens": 4,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7WA7UT5q2NP34LvCiy",
-        "session_id": "bb4c779d-c1e5-47ef-a8f4-c29a8a4e7653",
+        "request_id": "req_011CduQGKG58kTSqHFwxnN8x",
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "timestamp": "2026-08-10T16:42:29.382Z",
         "type": "assistant",
-        "uuid": "e5c6b9b1-f044-42ff-9b19-5eb6420a2366"
+        "uuid": "0942fb7e-76bd-4cbc-9f2e-00345affdd3e"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "index": 0,
+          "type": "content_block_stop"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "0517efcc-7570-405e-b07e-3785c2fa8dcf"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "content_block": {
+            "text": "",
+            "type": "text"
+          },
+          "index": 1,
+          "type": "content_block_start"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "6417b417-f237-4b3c-8e66-139af6f04879"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "text": "Perfect! Here are",
+            "type": "text_delta"
+          },
+          "index": 1,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "8885b6bd-b739-4d25-a1e5-f84d46d61601"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "delta": {
+            "text": " the results:\n\n1. **15 \u00d7 7 = 105**\n2. **105 - 5 = 100**\n\n**Final answer: 100**",
+            "type": "text_delta"
+          },
+          "index": 1,
+          "type": "content_block_delta"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "833cba4c-8fce-4ecd-b105-145526f17fa6"
       }
     },
     {
@@ -837,13 +2443,13 @@
         "message": {
           "content": [
             {
-              "text": "The answer is **100**.\n\nHere's the breakdown:\n- 15 \u00d7 7 = **105**\n- 105 - 5 = **100**",
+              "text": "Perfect! Here are the results:\n\n1. **15 \u00d7 7 = 105**\n2. **105 - 5 = 100**\n\n**Final answer: 100**",
               "type": "text"
             }
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01BLdFiureh3DEprWKdGE6fx",
+          "id": "msg_011CduQGKpK8BTWTkAWknSwM",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -853,76 +2459,149 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 386
+              "ephemeral_5m_input_tokens": 155
             },
-            "cache_creation_input_tokens": 386,
-            "cache_read_input_tokens": 44678,
+            "cache_creation_input_tokens": 155,
+            "cache_read_input_tokens": 17806,
             "inference_geo": "not_available",
             "input_tokens": 8,
-            "output_tokens": 4,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7WA7UT5q2NP34LvCiy",
-        "session_id": "bb4c779d-c1e5-47ef-a8f4-c29a8a4e7653",
+        "request_id": "req_011CduQGKG58kTSqHFwxnN8x",
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "timestamp": "2026-08-10T16:42:29.512Z",
         "type": "assistant",
-        "uuid": "3bb1fe67-4dda-4205-8a71-dbb3ae522cba"
+        "uuid": "70b20ed5-8be7-4a99-9f03-910cdcd34276"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "index": 1,
+          "type": "content_block_stop"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "49ceb2d3-0e8e-47c1-adec-90aadd02d4b0"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "context_management": {
+            "applied_edits": []
+          },
+          "delta": {
+            "stop_details": null,
+            "stop_reason": "end_turn",
+            "stop_sequence": null
+          },
+          "type": "message_delta",
+          "usage": {
+            "cache_creation_input_tokens": 155,
+            "cache_read_input_tokens": 17806,
+            "input_tokens": 8,
+            "iterations": [
+              {
+                "cache_creation": {
+                  "ephemeral_1h_input_tokens": 0,
+                  "ephemeral_5m_input_tokens": 155
+                },
+                "cache_creation_input_tokens": 155,
+                "cache_read_input_tokens": 17806,
+                "input_tokens": 8,
+                "output_tokens": 97,
+                "type": "message"
+              }
+            ],
+            "output_tokens": 97,
+            "output_tokens_details": {
+              "thinking_tokens": 48
+            }
+          }
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "ae7be1a7-e0ca-4b05-be8d-42050b28697c"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "event": {
+          "type": "message_stop"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
+        "type": "stream_event",
+        "uuid": "7df3afbe-83a2-4b86-b00b-045976e4d26c"
       }
     },
     {
       "op": "read",
       "payload": {
         "api_error_status": null,
-        "duration_api_ms": 8108,
-        "duration_ms": 6876,
+        "duration_api_ms": 6033,
+        "duration_ms": 6883,
+        "fast_mode_disabled_reason": "sdk_opt_in_required",
         "fast_mode_state": "off",
         "is_error": false,
         "modelUsage": {
           "claude-haiku-4-5-20251001": {
-            "cacheCreationInputTokens": 45064,
-            "cacheReadInputTokens": 44678,
+            "cacheCreationInputTokens": 8651,
+            "cacheReadInputTokens": 62020,
+            "canonicalModel": "claude-haiku-4-5",
             "contextWindow": 200000,
-            "costUSD": 0.0631868,
-            "inputTokens": 474,
+            "costUSD": 0.01983675,
+            "inputTokens": 36,
             "maxOutputTokens": 32000,
-            "outputTokens": 383,
+            "outputTokens": 557,
+            "provider": "firstParty",
             "webSearchRequests": 0
           }
         },
-        "num_turns": 3,
+        "num_turns": 4,
         "permission_denials": [],
-        "result": "The answer is **100**.\n\nHere's the breakdown:\n- 15 \u00d7 7 = **105**\n- 105 - 5 = **100**",
-        "session_id": "bb4c779d-c1e5-47ef-a8f4-c29a8a4e7653",
+        "result": "Perfect! Here are the results:\n\n1. **15 \u00d7 7 = 105**\n2. **105 - 5 = 100**\n\n**Final answer: 100**",
+        "session_id": "8bbeb10f-494b-4b32-a328-2848a37aaec4",
         "stop_reason": "end_turn",
         "subtype": "success",
         "terminal_reason": "completed",
-        "total_cost_usd": 0.0631868,
-        "ttft_ms": 3047,
+        "time_to_request_ms": 160,
+        "total_cost_usd": 0.01983675,
+        "ttft_ms": 2024,
+        "ttft_stream_ms": 976,
         "type": "result",
         "usage": {
           "cache_creation": {
             "ephemeral_1h_input_tokens": 0,
-            "ephemeral_5m_input_tokens": 45064
+            "ephemeral_5m_input_tokens": 8651
           },
-          "cache_creation_input_tokens": 45064,
-          "cache_read_input_tokens": 44678,
-          "inference_geo": "",
-          "input_tokens": 18,
+          "cache_creation_input_tokens": 8651,
+          "cache_read_input_tokens": 62020,
+          "inference_geo": "not_available",
+          "input_tokens": 36,
           "iterations": [
             {
               "cache_creation": {
                 "ephemeral_1h_input_tokens": 0,
-                "ephemeral_5m_input_tokens": 386
+                "ephemeral_5m_input_tokens": 155
               },
-              "cache_creation_input_tokens": 386,
-              "cache_read_input_tokens": 44678,
+              "cache_creation_input_tokens": 155,
+              "cache_read_input_tokens": 17806,
               "input_tokens": 8,
-              "output_tokens": 89,
+              "output_tokens": 97,
               "type": "message"
             }
           ],
-          "output_tokens": 372,
+          "output_tokens": 557,
           "server_tool_use": {
             "web_fetch_requests": 0,
             "web_search_requests": 0
@@ -930,9 +2609,9 @@
           "service_tier": "standard",
           "speed": "standard"
         },
-        "uuid": "9a3c05b4-09cd-4551-acec-5884b1de2410"
+        "uuid": "d1f074b0-f459-467d-965b-4331da777be6"
       }
     }
   ],
-  "sdk_version": "0.2.82"
+  "sdk_version": "0.2.129"
 }
diff --git a/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_multiple_bundled_subagents_keep_outer_orchestration_separate.json b/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_multiple_bundled_subagents_keep_outer_orchestration_separate.json
index d19ca15af..81ee86ce5 100644
--- a/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_multiple_bundled_subagents_keep_outer_orchestration_separate.json
+++ b/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_multiple_bundled_subagents_keep_outer_orchestration_separate.json
@@ -10,21 +10,50 @@
             "hooks": null,
             "subtype": "initialize"
           },
-          "request_id": "req_1_59a11d31",
+          "request_id": "req_1_2c9b9d93",
           "type": "control_request"
         }
       }
     },
+    {
+      "op": "read",
+      "payload": {
+        "hook_event": "SessionStart",
+        "hook_id": "528b9ad5-27bd-4daa-916d-0b6164ddeb5f",
+        "hook_name": "SessionStart:startup",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "hook_started",
+        "type": "system",
+        "uuid": "307bd03b-7ed0-4061-ac2f-c9e9d93f038e"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "exit_code": 0,
+        "hook_event": "SessionStart",
+        "hook_id": "528b9ad5-27bd-4daa-916d-0b6164ddeb5f",
+        "hook_name": "SessionStart:startup",
+        "outcome": "success",
+        "output": "",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "stderr": "",
+        "stdout": "",
+        "subtype": "hook_response",
+        "type": "system",
+        "uuid": "6ec5f683-bcda-46ed-9d7e-b45c672c863e"
+      }
+    },
     {
       "op": "read",
       "payload": {
         "response": {
-          "request_id": "req_1_59a11d31",
+          "request_id": "req_1_2c9b9d93",
           "response": {
             "account": {
               "apiKeySource": "ANTHROPIC_API_KEY",
               "apiProvider": "firstParty",
-              "tokenSource": "none"
+              "tokenSource": "claude.ai"
             },
             "agents": [],
             "available_output_styles": [],
@@ -42,7 +71,7 @@
         "kind": "json",
         "value": {
           "message": {
-            "content": "Launch two bundled general-purpose subagents for two independent tasks. Start both Agent tool calls before waiting on either result if the tool API allows it. The first delegated subagent must use Bash and Read on release_notes_alpha.md and return only 'alpha:<version> | <owner>'. The second delegated subagent must use Bash and Read on release_notes_beta.md and return only 'beta:<version> | <owner>'. After both delegated agents finish, reply with exactly two lines in that same order. Do not answer directly without using both subagents.",
+            "content": "Launch two bundled general-purpose subagents for two independent tasks. Start both Agent tool calls before waiting on either result if the tool API allows it. The first delegated subagent must use Bash and Read on release_notes_alpha.md and return only 'alpha:<version> | <owner>'. The second delegated subagent must use Bash and Read on release_notes_beta.md and return only 'beta:<version> | <owner>'. If either agent runs in the background, use TaskOutput with block=true to wait for each result. Do not finish while either task is still running. After both delegated agents finish, reply with exactly two lines in that same order. Do not answer directly without using both subagents.",
             "role": "user"
           },
           "parent_tool_use_id": null,
@@ -63,8 +92,14 @@
         ],
         "analytics_disabled": false,
         "apiKeySource": "ANTHROPIC_API_KEY",
-        "claude_code_version": "2.1.142",
+        "capabilities": [
+          "interrupt_receipt_v1",
+          "interrupt_cancel_queued_v1",
+          "msg_lifecycle_v1"
+        ],
+        "claude_code_version": "2.1.221",
         "cwd": "<REDACTED_CWD>",
+        "fast_mode_disabled_reason": "sdk_opt_in_required",
         "fast_mode_state": "off",
         "mcp_servers": [],
         "memory_paths": {
@@ -77,64 +112,95 @@
           {
             "name": "rust-analyzer-lsp",
             "path": "<REDACTED_PATH>",
-            "source": "rust-analyzer-lsp@claude-plugins-official"
+            "source": "rust-analyzer-lsp@claude-plugins-official",
+            "version": "1.0.0"
           }
         ],
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "product_feedback_disabled": false,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
         "skills": [
-          "create-braintrust-demo",
           "braintrust",
+          "create-braintrust-demo",
+          "design-sync",
+          "dataviz",
           "update-config",
+          "verify",
           "debug",
+          "code-review",
           "simplify",
           "batch",
           "fewer-permission-prompts",
+          "doctor",
           "loop",
-          "claude-api"
+          "claude-api",
+          "run",
+          "run-skill-generator"
         ],
         "slash_commands": [
-          "create-braintrust-demo",
           "braintrust",
+          "create-braintrust-demo",
+          "design-sync",
+          "dataviz",
           "update-config",
+          "verify",
           "debug",
+          "code-review",
           "simplify",
           "batch",
           "fewer-permission-prompts",
+          "doctor",
           "loop",
           "claude-api",
+          "run",
+          "run-skill-generator",
+          "agents",
+          "autocompact",
           "clear",
+          "color",
           "compact",
+          "config",
           "context",
+          "effort",
+          "fast",
           "heapdump",
           "init",
+          "mcp",
+          "import",
+          "model",
+          "__remote-workflow",
+          "workflow-launch-exec",
+          "reload-skills",
+          "rename",
           "review",
           "security-review",
           "usage",
           "insights",
+          "recap",
           "goal",
+          "design",
+          "design-consent",
+          "design-revoke",
           "team-onboarding"
         ],
         "subtype": "init",
         "tools": [
           "Task",
-          "AskUserQuestion",
           "Bash",
           "CronCreate",
           "CronDelete",
           "CronList",
+          "DesignSync",
           "Edit",
-          "EnterPlanMode",
           "EnterWorktree",
-          "ExitPlanMode",
           "ExitWorktree",
-          "Glob",
-          "Grep",
           "LSP",
           "Monitor",
           "NotebookEdit",
           "PushNotification",
           "Read",
+          "ReportFindings",
           "ScheduleWakeup",
+          "SendMessage",
           "Skill",
           "TaskCreate",
           "TaskGet",
@@ -148,7 +214,73 @@
           "Write"
         ],
         "type": "system",
-        "uuid": "f0edd6f7-d89d-438f-b527-1476c42dd23e"
+        "uuid": "0b56d646-fc63-4a2a-b5ab-ad585bc0fac9"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 4,
+        "estimated_tokens_delta": 4,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "13892022-438f-4b16-b19b-7c200a4c74ac"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 39,
+        "estimated_tokens_delta": 35,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "badc505b-6195-4eba-835d-08cb4ebf54f1"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 105,
+        "estimated_tokens_delta": 66,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "065dafe5-32de-4fa5-a4dd-9ac69bc53e96"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 144,
+        "estimated_tokens_delta": 39,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "35a7c2d9-814b-4596-8fee-341237221f78"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 166,
+        "estimated_tokens_delta": 22,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "6e0a3e13-56ef-4a0e-842f-e0c1b856bf2d"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 228,
+        "estimated_tokens_delta": 62,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "099f460f-d999-4ae0-a88d-3da66752607f"
       }
     },
     {
@@ -158,13 +290,13 @@
           "content": [
             {
               "signature": "<REDACTED_SIGNATURE>",
-              "thinking": "The user wants me to:\n1. Launch two independent subagents in parallel\n2. First subagent: reads release_notes_alpha.md and returns 'alpha:<version> | <owner>'\n3. Second subagent: reads release_notes_beta.md and returns 'beta:<version> | <owner>'\n4. Wait for both to complete\n5. Reply with exactly two lines in that order\n\nI should use the Agent tool to create two general-purpose agents that will handle these tasks independently. Since these are independent tasks, I can launch both in the same function_calls block.\n\nLet me create two agents:\n1. First agent for alpha release notes\n2. Second agent for beta release notes\n\nThe agents should use Bash and Read tools to examine the files and extract the version and owner information.",
+              "thinking": "The user wants me to:\n1. Launch two general-purpose subagents in parallel\n2. First agent: Read release_notes_alpha.md and return 'alpha:<version> | <owner>'\n3. Second agent: Read release_notes_beta.md and return 'beta:<version> | <owner>'\n4. If they run in background, use TaskOutput with block=true to wait\n5. Reply with exactly two lines in that same order\n6. Don't finish while either task is running\n\nThe user says \"Start both Agent tool calls before waiting on either result if the tool API allows it\" - this means I should make both Agent calls in the same function_calls block.\n\nLet me create two agent calls with specific, clear instructions for each.",
               "type": "thinking"
             }
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01T47uDZvxsraKwAewJL9PLi",
+          "id": "msg_011CduPx6yeNCuicbSoGeHgC",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -174,21 +306,62 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 23765
+              "ephemeral_5m_input_tokens": 2570
             },
-            "cache_creation_input_tokens": 23765,
-            "cache_read_input_tokens": 0,
+            "cache_creation_input_tokens": 2570,
+            "cache_read_input_tokens": 9310,
             "inference_geo": "not_available",
             "input_tokens": 10,
-            "output_tokens": 1,
+            "output_tokens": 3,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": null,
+        "request_id": "req_011CduPx6VNZzqpECx3Hnr3d",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:23.353Z",
+        "type": "assistant",
+        "uuid": "520534f1-28b8-431e-a9c7-bdcd5f00f033"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "text": "I'll launch two general-purpose subagents in parallel to extract the version and owner information from both release notes files.",
+              "type": "text"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPx6yeNCuicbSoGeHgC",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 2570
+            },
+            "cache_creation_input_tokens": 2570,
+            "cache_read_input_tokens": 9310,
+            "inference_geo": "not_available",
+            "input_tokens": 10,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7mvHDcDnCoTNnjsGJr",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "request_id": "req_011CduPx6VNZzqpECx3Hnr3d",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:23.694Z",
         "type": "assistant",
-        "uuid": "4ed95d4e-66f4-425a-8fd8-fecb0818d3e4"
+        "uuid": "3e404051-a3c5-4a7d-84d7-57cc5390ec30"
       }
     },
     {
@@ -200,10 +373,11 @@
               "caller": {
                 "type": "direct"
               },
-              "id": "toolu_01J2z1oBP9XHSZgLdRGzvoRt",
+              "id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
               "input": {
                 "description": "Extract alpha version and owner",
-                "prompt": "Read the file release_notes_alpha.md using the Read tool. Extract and return ONLY the version and owner in the format: 'alpha:<version> | <owner>'. Do not include any other text or explanation."
+                "prompt": "Read the file release_notes_alpha.md and extract the version and owner. Return ONLY the string in this format: alpha:<version> | <owner>\n\nExample output: alpha:1.2.3 | john-doe\n\nDo not include any other text or explanation.",
+                "subagent_type": "general-purpose"
               },
               "name": "Agent",
               "type": "tool_use"
@@ -211,7 +385,7 @@
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01T47uDZvxsraKwAewJL9PLi",
+          "id": "msg_011CduPx6yeNCuicbSoGeHgC",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -221,36 +395,53 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 23765
+              "ephemeral_5m_input_tokens": 2570
             },
-            "cache_creation_input_tokens": 23765,
-            "cache_read_input_tokens": 0,
+            "cache_creation_input_tokens": 2570,
+            "cache_read_input_tokens": 9310,
             "inference_geo": "not_available",
             "input_tokens": 10,
-            "output_tokens": 1,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7mvHDcDnCoTNnjsGJr",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "request_id": "req_011CduPx6VNZzqpECx3Hnr3d",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:24.645Z",
         "type": "assistant",
-        "uuid": "ec835647-99b0-4394-b622-83275b4aa876"
+        "uuid": "ffd09e16-aa9f-466d-867d-4700325c5481"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "background_tasks_changed",
+        "tasks": [
+          {
+            "description": "Extract alpha version and owner",
+            "task_id": "acc13030b342e6516",
+            "task_type": "local_agent"
+          }
+        ],
+        "type": "system",
+        "uuid": "c7c5e5c7-11ce-44f4-8f96-79b404e8d38b"
       }
     },
     {
       "op": "read",
       "payload": {
         "description": "Extract alpha version and owner",
-        "prompt": "Read the file release_notes_alpha.md using the Read tool. Extract and return ONLY the version and owner in the format: 'alpha:<version> | <owner>'. Do not include any other text or explanation.",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "prompt": "Read the file release_notes_alpha.md and extract the version and owner. Return ONLY the string in this format: alpha:<version> | <owner>\n\nExample output: alpha:1.2.3 | john-doe\n\nDo not include any other text or explanation.",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
         "subagent_type": "general-purpose",
         "subtype": "task_started",
-        "task_id": "a4e4e0ab3cf303af7",
+        "task_id": "acc13030b342e6516",
         "task_type": "local_agent",
-        "tool_use_id": "toolu_01J2z1oBP9XHSZgLdRGzvoRt",
+        "tool_use_id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
         "type": "system",
-        "uuid": "4c2a34ef-1709-4933-b659-7a29599923ad"
+        "uuid": "40963c23-6f95-4ebe-b63f-8b2596d42145"
       }
     },
     {
@@ -259,19 +450,33 @@
         "message": {
           "content": [
             {
-              "text": "Read the file release_notes_alpha.md using the Read tool. Extract and return ONLY the version and owner in the format: 'alpha:<version> | <owner>'. Do not include any other text or explanation.",
-              "type": "text"
+              "content": [
+                {
+                  "text": "Async agent launched successfully. (This tool result is internal metadata \u2014 never quote or paste any part of it, including the agentId below, into a user-facing reply.)\nagentId: acc13030b342e6516 (internal ID - do not mention to user. Use SendMessage with to: 'acc13030b342e6516', summary: '<5-10 word recap>' to continue this agent.)\nThe agent is working in the background. You will be notified automatically when it completes. You know nothing about its results until that notification arrives \u2014 do not report, assume, or predict them; continue other work or respond to the user in the meantime.\nDo not duplicate this agent's work \u2014 avoid working with the same files or topics it is using.\noutput_file: <REDACTED_PATH>\nDo NOT Read or tail this file via the shell tool \u2014 it is the full subagent JSONL transcript and reading it will overflow your context. If the user asks for progress, say the agent is still running; you'll get a completion notification.",
+                  "type": "text"
+                }
+              ],
+              "tool_use_id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
+              "type": "tool_result"
             }
           ],
           "role": "user"
         },
-        "parent_tool_use_id": "toolu_01J2z1oBP9XHSZgLdRGzvoRt",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "subagent_type": "general-purpose",
-        "task_description": "Extract alpha version and owner",
-        "timestamp": "2026-05-19T14:53:00.583Z",
+        "parent_tool_use_id": null,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:24.814Z",
+        "tool_use_result": {
+          "agentId": "acc13030b342e6516",
+          "canReadOutputFile": true,
+          "description": "Extract alpha version and owner",
+          "isAsync": true,
+          "outputFile": "<REDACTED_PATH>",
+          "prompt": "Read the file release_notes_alpha.md and extract the version and owner. Return ONLY the string in this format: alpha:<version> | <owner>\n\nExample output: alpha:1.2.3 | john-doe\n\nDo not include any other text or explanation.",
+          "resolvedModel": "claude-haiku-4-5-20251001",
+          "status": "async_launched"
+        },
         "type": "user",
-        "uuid": "776d620c-ffe1-4f32-8a13-dd22319d5615"
+        "uuid": "49908e70-0f3d-42f8-9da2-22c50e3334d2"
       }
     },
     {
@@ -283,10 +488,11 @@
               "caller": {
                 "type": "direct"
               },
-              "id": "toolu_01UyhHgNEXve8Z5eZ4ebw7fb",
+              "id": "toolu_01XkapD7V36nPRGqQVPTftn3",
               "input": {
                 "description": "Extract beta version and owner",
-                "prompt": "Read the file release_notes_beta.md using the Read tool. Extract and return ONLY the version and owner in the format: 'beta:<version> | <owner>'. Do not include any other text or explanation."
+                "prompt": "Read the file release_notes_beta.md and extract the version and owner. Return ONLY the string in this format: beta:<version> | <owner>\n\nExample output: beta:2.0.0 | jane-smith\n\nDo not include any other text or explanation.",
+                "subagent_type": "general-purpose"
               },
               "name": "Agent",
               "type": "tool_use"
@@ -294,7 +500,7 @@
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01T47uDZvxsraKwAewJL9PLi",
+          "id": "msg_011CduPx6yeNCuicbSoGeHgC",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -304,36 +510,58 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 23765
+              "ephemeral_5m_input_tokens": 2570
             },
-            "cache_creation_input_tokens": 23765,
-            "cache_read_input_tokens": 0,
+            "cache_creation_input_tokens": 2570,
+            "cache_read_input_tokens": 9310,
             "inference_geo": "not_available",
             "input_tokens": 10,
-            "output_tokens": 1,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7mvHDcDnCoTNnjsGJr",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "request_id": "req_011CduPx6VNZzqpECx3Hnr3d",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:24.933Z",
         "type": "assistant",
-        "uuid": "436af7f9-c252-41f1-9109-e089a17524dd"
+        "uuid": "877b36cc-9729-4b29-911c-9036ce3e39f9"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "background_tasks_changed",
+        "tasks": [
+          {
+            "description": "Extract alpha version and owner",
+            "task_id": "acc13030b342e6516",
+            "task_type": "local_agent"
+          },
+          {
+            "description": "Extract beta version and owner",
+            "task_id": "aa2d67565d2de9f26",
+            "task_type": "local_agent"
+          }
+        ],
+        "type": "system",
+        "uuid": "c9cfe586-1fc4-49e3-b8c6-eba7358bf07b"
       }
     },
     {
       "op": "read",
       "payload": {
         "description": "Extract beta version and owner",
-        "prompt": "Read the file release_notes_beta.md using the Read tool. Extract and return ONLY the version and owner in the format: 'beta:<version> | <owner>'. Do not include any other text or explanation.",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "prompt": "Read the file release_notes_beta.md and extract the version and owner. Return ONLY the string in this format: beta:<version> | <owner>\n\nExample output: beta:2.0.0 | jane-smith\n\nDo not include any other text or explanation.",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
         "subagent_type": "general-purpose",
         "subtype": "task_started",
-        "task_id": "a5d4959a2c92999f6",
+        "task_id": "aa2d67565d2de9f26",
         "task_type": "local_agent",
-        "tool_use_id": "toolu_01UyhHgNEXve8Z5eZ4ebw7fb",
+        "tool_use_id": "toolu_01XkapD7V36nPRGqQVPTftn3",
         "type": "system",
-        "uuid": "4273d349-5dfb-4601-91d9-cb21a0fdcd77"
+        "uuid": "63f27236-fe47-4216-b5d8-5fb5223f80cd"
       }
     },
     {
@@ -342,38 +570,88 @@
         "message": {
           "content": [
             {
-              "text": "Read the file release_notes_beta.md using the Read tool. Extract and return ONLY the version and owner in the format: 'beta:<version> | <owner>'. Do not include any other text or explanation.",
-              "type": "text"
+              "content": [
+                {
+                  "text": "Async agent launched successfully. (This tool result is internal metadata \u2014 never quote or paste any part of it, including the agentId below, into a user-facing reply.)\nagentId: aa2d67565d2de9f26 (internal ID - do not mention to user. Use SendMessage with to: 'aa2d67565d2de9f26', summary: '<5-10 word recap>' to continue this agent.)\nThe agent is working in the background. You will be notified automatically when it completes. You know nothing about its results until that notification arrives \u2014 do not report, assume, or predict them; continue other work or respond to the user in the meantime.\nDo not duplicate this agent's work \u2014 avoid working with the same files or topics it is using.\noutput_file: <REDACTED_PATH>\nDo NOT Read or tail this file via the shell tool \u2014 it is the full subagent JSONL transcript and reading it will overflow your context. If the user asks for progress, say the agent is still running; you'll get a completion notification.",
+                  "type": "text"
+                }
+              ],
+              "tool_use_id": "toolu_01XkapD7V36nPRGqQVPTftn3",
+              "type": "tool_result"
             }
           ],
           "role": "user"
         },
-        "parent_tool_use_id": "toolu_01UyhHgNEXve8Z5eZ4ebw7fb",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "subagent_type": "general-purpose",
-        "task_description": "Extract beta version and owner",
-        "timestamp": "2026-05-19T14:53:00.816Z",
+        "parent_tool_use_id": null,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:25.117Z",
+        "tool_use_result": {
+          "agentId": "aa2d67565d2de9f26",
+          "canReadOutputFile": true,
+          "description": "Extract beta version and owner",
+          "isAsync": true,
+          "outputFile": "<REDACTED_PATH>",
+          "prompt": "Read the file release_notes_beta.md and extract the version and owner. Return ONLY the string in this format: beta:<version> | <owner>\n\nExample output: beta:2.0.0 | jane-smith\n\nDo not include any other text or explanation.",
+          "resolvedModel": "claude-haiku-4-5-20251001",
+          "status": "async_launched"
+        },
         "type": "user",
-        "uuid": "4c3c1e5b-c3a5-4959-8805-71bfb6365060"
+        "uuid": "adab733f-131c-4b08-8326-19a148213b3e"
       }
     },
     {
       "op": "read",
       "payload": {
-        "description": "Reading release_notes_alpha.md",
-        "last_tool_name": "Read",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "subagent_type": "general-purpose",
-        "subtype": "task_progress",
-        "task_id": "a4e4e0ab3cf303af7",
-        "tool_use_id": "toolu_01J2z1oBP9XHSZgLdRGzvoRt",
+        "estimated_tokens": 1,
+        "estimated_tokens_delta": 1,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
         "type": "system",
-        "usage": {
-          "duration_ms": 2593,
-          "tool_uses": 1,
-          "total_tokens": 17832
-        },
-        "uuid": "2f979d67-c8e3-4536-9e71-c933ebb61850"
+        "uuid": "ea50c62f-4e9c-4c22-89cf-300c5e9d053f"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 6,
+        "estimated_tokens_delta": 5,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "06f34acc-48b5-4d56-9420-b4a4d27e27a4"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 7,
+        "estimated_tokens_delta": 1,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "8e1468c4-32a7-4bf8-9aa5-438c7d7b7a5a"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 11,
+        "estimated_tokens_delta": 4,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "5cb01bbd-37b7-4088-a15c-1a918cd9aeba"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 15,
+        "estimated_tokens_delta": 4,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "309f3702-9a83-4962-8c49-9c7d529dc978"
       }
     },
     {
@@ -382,20 +660,14 @@
         "message": {
           "content": [
             {
-              "caller": {
-                "type": "direct"
-              },
-              "id": "toolu_016MQb2SwFuHidwpA5VLrMQK",
-              "input": {
-                "file_path": "/private/var/folders/1r/0r49yqc973s87vl4n1x_3j1m0000gn/T/pytest-of-abhijeetprasad/pytest-0/test_multiple_bundled_subagent0/subagent_multi_workspace/release_notes_alpha.md"
-              },
-              "name": "Read",
-              "type": "tool_use"
+              "signature": "<REDACTED_SIGNATURE>",
+              "thinking": "The user wants me to:\n1. Read the file release_notes_alpha.md\n2. Extract the version and owner\n3. Return ONLY a string in the format: alpha:<version> | <owner>\n\nLet me first read the file to see what's in it.",
+              "type": "thinking"
             }
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01SeTNhKACUet4KTZ6dxwGJQ",
+          "id": "msg_011CduPxNQLDeUvWas41k16F",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -405,64 +677,57 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 17817
+              "ephemeral_5m_input_tokens": 2761
             },
-            "cache_creation_input_tokens": 17817,
-            "cache_read_input_tokens": 0,
+            "cache_creation_input_tokens": 2761,
+            "cache_read_input_tokens": 7557,
             "inference_geo": "not_available",
-            "input_tokens": 3,
-            "output_tokens": 6,
+            "input_tokens": 10,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
-        "parent_tool_use_id": "toolu_01J2z1oBP9XHSZgLdRGzvoRt",
-        "request_id": "req_011CbC7nBQJkMqztMzueMskc",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "parent_tool_use_id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
+        "request_id": "req_011CduPxMiAKMXzkXh6HxpjL",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
         "subagent_type": "general-purpose",
         "task_description": "Extract alpha version and owner",
+        "timestamp": "2026-08-10T16:38:26.109Z",
         "type": "assistant",
-        "uuid": "8e0ee32f-b765-4ab9-9824-a48fa1bd2839"
+        "uuid": "c6fa6dfa-9d61-44f2-9451-cede5904f055"
       }
     },
     {
       "op": "read",
       "payload": {
-        "message": {
-          "content": [
-            {
-              "content": "1\t# Alpha Release Notes\n2\t\n3\tversion = 2026.03.11-alpha\n4\towner = sdk-platform-alpha\n5\t",
-              "tool_use_id": "toolu_016MQb2SwFuHidwpA5VLrMQK",
-              "type": "tool_result"
-            }
-          ],
-          "role": "user"
-        },
-        "parent_tool_use_id": "toolu_01J2z1oBP9XHSZgLdRGzvoRt",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "subagent_type": "general-purpose",
-        "task_description": "Extract alpha version and owner",
-        "timestamp": "2026-05-19T14:53:03.180Z",
-        "type": "user",
-        "uuid": "1b5c0ed5-61cf-4cf4-bfa8-15fd1159331f"
+        "estimated_tokens": 39,
+        "estimated_tokens_delta": 24,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "7538fb83-4f9a-404f-9033-5a0a9f8d3002"
       }
     },
     {
       "op": "read",
       "payload": {
-        "description": "Reading release_notes_beta.md",
-        "last_tool_name": "Read",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "subagent_type": "general-purpose",
-        "subtype": "task_progress",
-        "task_id": "a5d4959a2c92999f6",
-        "tool_use_id": "toolu_01UyhHgNEXve8Z5eZ4ebw7fb",
+        "estimated_tokens": 51,
+        "estimated_tokens_delta": 12,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
         "type": "system",
-        "usage": {
-          "duration_ms": 2473,
-          "tool_uses": 1,
-          "total_tokens": 17830
-        },
-        "uuid": "e12fdd70-4d90-4d2c-98a9-17cf96cb904e"
+        "uuid": "55daa2b9-db38-4e43-ac36-a1d3788ae836"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 113,
+        "estimated_tokens_delta": 62,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "e559d8b4-e6df-495c-8002-db5b8d2efb72"
       }
     },
     {
@@ -471,20 +736,14 @@
         "message": {
           "content": [
             {
-              "caller": {
-                "type": "direct"
-              },
-              "id": "toolu_01KhKqV7KugwwjFGogkArDsA",
-              "input": {
-                "file_path": "/private/var/folders/1r/0r49yqc973s87vl4n1x_3j1m0000gn/T/pytest-of-abhijeetprasad/pytest-0/test_multiple_bundled_subagent0/subagent_multi_workspace/release_notes_beta.md"
-              },
-              "name": "Read",
-              "type": "tool_use"
+              "signature": "<REDACTED_SIGNATURE>",
+              "thinking": "Both agents are running in the background. I need to wait for them to complete using TaskOutput with block=true. Let me fetch the ToolSearch results for TaskOutput first since it's a deferred tool.",
+              "type": "thinking"
             }
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_017zS1pcehe5WLx6pTzjxsKb",
+          "id": "msg_011CduPxQEiKBkwuwtDNELAN",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -494,23 +753,22 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 17817
+              "ephemeral_5m_input_tokens": 1248
             },
-            "cache_creation_input_tokens": 17817,
-            "cache_read_input_tokens": 0,
+            "cache_creation_input_tokens": 1248,
+            "cache_read_input_tokens": 11880,
             "inference_geo": "not_available",
-            "input_tokens": 3,
-            "output_tokens": 5,
+            "input_tokens": 8,
+            "output_tokens": 1,
             "service_tier": "standard"
           }
         },
-        "parent_tool_use_id": "toolu_01UyhHgNEXve8Z5eZ4ebw7fb",
-        "request_id": "req_011CbC7nCMMdhAcNtSCezrMF",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "subagent_type": "general-purpose",
-        "task_description": "Extract beta version and owner",
+        "parent_tool_use_id": null,
+        "request_id": "req_011CduPxPfV8zqh6Qg5cHAih",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:26.779Z",
         "type": "assistant",
-        "uuid": "6c5722b5-2838-46df-847b-5aa82b0f3b85"
+        "uuid": "2efb6a02-d680-42d2-ac37-9d58b4cbd4ab"
       }
     },
     {
@@ -519,39 +777,38 @@
         "message": {
           "content": [
             {
-              "content": "1\t# Beta Release Notes\n2\t\n3\tversion = 2026.03.11-beta\n4\towner = sdk-platform-beta\n5\t",
-              "tool_use_id": "toolu_01KhKqV7KugwwjFGogkArDsA",
-              "type": "tool_result"
+              "text": "I'll now wait for both agents to complete using TaskOutput.",
+              "type": "text"
             }
           ],
-          "role": "user"
-        },
-        "parent_tool_use_id": "toolu_01UyhHgNEXve8Z5eZ4ebw7fb",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "subagent_type": "general-purpose",
-        "task_description": "Extract beta version and owner",
-        "timestamp": "2026-05-19T14:53:03.291Z",
-        "type": "user",
-        "uuid": "18a83028-bd30-4ffb-8da0-e59cf3485f79"
-      }
-    },
-    {
-      "op": "read",
-      "payload": {
-        "output_file": "",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "status": "completed",
-        "subtype": "task_notification",
-        "summary": "Extract alpha version and owner",
-        "task_id": "a4e4e0ab3cf303af7",
-        "tool_use_id": "toolu_01J2z1oBP9XHSZgLdRGzvoRt",
-        "type": "system",
-        "usage": {
-          "duration_ms": 3643,
-          "tool_uses": 1,
-          "total_tokens": 18028
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxQEiKBkwuwtDNELAN",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 1248
+            },
+            "cache_creation_input_tokens": 1248,
+            "cache_read_input_tokens": 11880,
+            "inference_geo": "not_available",
+            "input_tokens": 8,
+            "output_tokens": 1,
+            "service_tier": "standard"
+          }
         },
-        "uuid": "5a7f6f45-13e2-4406-95b1-16c54bf35e85"
+        "parent_tool_use_id": null,
+        "request_id": "req_011CduPxPfV8zqh6Qg5cHAih",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:27.196Z",
+        "type": "assistant",
+        "uuid": "9920f67e-fde4-4aa0-94fe-9756b3201075"
       }
     },
     {
@@ -560,100 +817,629 @@
         "message": {
           "content": [
             {
-              "content": [
-                {
-                  "text": "alpha:2026.03.11-alpha | sdk-platform-alpha",
-                  "type": "text"
-                },
-                {
-                  "text": "agentId: a4e4e0ab3cf303af7 (use SendMessage with to: 'a4e4e0ab3cf303af7' to continue this agent)\n<usage>total_tokens: 18034\ntool_uses: 1\nduration_ms: 3644</usage>",
-                  "type": "text"
-                }
+              "caller": {
+                "type": "direct"
+              },
+              "id": "toolu_012wqkMpWmS2JxzZbSzpyYPF",
+              "input": {
+                "file_path": "<REDACTED_PATH>"
+              },
+              "name": "Read",
+              "type": "tool_use"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxNQLDeUvWas41k16F",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 2761
+            },
+            "cache_creation_input_tokens": 2761,
+            "cache_read_input_tokens": 7557,
+            "inference_geo": "not_available",
+            "input_tokens": 10,
+            "output_tokens": 3,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
+        "request_id": "req_011CduPxMiAKMXzkXh6HxpjL",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "task_description": "Extract alpha version and owner",
+        "timestamp": "2026-08-10T16:38:27.232Z",
+        "type": "assistant",
+        "uuid": "ea740e58-987b-4ba0-b59f-8c36f5d5d598"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "description": "Reading release_notes_alpha.md",
+        "last_tool_name": "Read",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "subtype": "task_progress",
+        "task_id": "acc13030b342e6516",
+        "tool_use_id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
+        "type": "system",
+        "usage": {
+          "duration_ms": 2582,
+          "tool_uses": 1,
+          "total_tokens": 10334
+        },
+        "uuid": "19986f6a-0537-4a76-a30c-c6274c87d4d0"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "caller": {
+                "type": "direct"
+              },
+              "id": "toolu_012JEqjXrPviwRH8WvDJCm6J",
+              "input": {
+                "max_results": 1,
+                "query": "select:TaskOutput"
+              },
+              "name": "ToolSearch",
+              "type": "tool_use"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxQEiKBkwuwtDNELAN",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 1248
+            },
+            "cache_creation_input_tokens": 1248,
+            "cache_read_input_tokens": 11880,
+            "inference_geo": "not_available",
+            "input_tokens": 8,
+            "output_tokens": 1,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": null,
+        "request_id": "req_011CduPxPfV8zqh6Qg5cHAih",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:27.395Z",
+        "type": "assistant",
+        "uuid": "966bec39-caec-4d75-8dcb-71d2bc423edd"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "content": "1\t# Alpha Release Notes\n2\t\n3\tversion = 2026.03.11-alpha\n4\towner = sdk-platform-alpha\n5\t",
+              "tool_use_id": "toolu_012wqkMpWmS2JxzZbSzpyYPF",
+              "type": "tool_result"
+            }
+          ],
+          "role": "user"
+        },
+        "parent_tool_use_id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "task_description": "Extract alpha version and owner",
+        "timestamp": "2026-08-10T16:38:27.427Z",
+        "type": "user",
+        "uuid": "771b3734-029a-428e-a62c-f97d04590483"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "content": [
+                {
+                  "tool_name": "TaskOutput",
+                  "type": "tool_reference"
+                }
               ],
-              "tool_use_id": "toolu_01J2z1oBP9XHSZgLdRGzvoRt",
+              "tool_use_id": "toolu_012JEqjXrPviwRH8WvDJCm6J",
+              "type": "tool_result"
+            }
+          ],
+          "role": "user"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:27.499Z",
+        "tool_use_result": {
+          "matches": [
+            "TaskOutput"
+          ],
+          "query": "select:TaskOutput",
+          "total_deferred_tools": 19
+        },
+        "type": "user",
+        "uuid": "e0c408ae-30eb-4fe7-b6aa-fd5a81b2ee84"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "signature": "<REDACTED_SIGNATURE>",
+              "thinking": "The user wants me to read the file `release_notes_beta.md` and extract the version and owner, then return it in a specific format: `beta:<version> | <owner>`.\n\nFirst, I need to find and read this file. Let me start by reading the file. Since this is a bash environment with a working directory set to `<REDACTED_PATH> I should use absolute paths.\n\nLet me try to read the file. I'll assume it's in the current working directory or search for it.",
+              "type": "thinking"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxPngHmuKQoGmEaRSm",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 2761
+            },
+            "cache_creation_input_tokens": 2761,
+            "cache_read_input_tokens": 7557,
+            "inference_geo": "not_available",
+            "input_tokens": 10,
+            "output_tokens": 6,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": "toolu_01XkapD7V36nPRGqQVPTftn3",
+        "request_id": "req_011CduPxPAE1AkT2vMds8zpE",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "task_description": "Extract beta version and owner",
+        "timestamp": "2026-08-10T16:38:27.945Z",
+        "type": "assistant",
+        "uuid": "ada6b3a8-c88a-4f76-9100-2852eb8e937f"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "caller": {
+                "type": "direct"
+              },
+              "id": "toolu_01DtuA5PphRpPpmAZs9XjKqH",
+              "input": {
+                "file_path": "<REDACTED_PATH>"
+              },
+              "name": "Read",
+              "type": "tool_use"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxPngHmuKQoGmEaRSm",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 2761
+            },
+            "cache_creation_input_tokens": 2761,
+            "cache_read_input_tokens": 7557,
+            "inference_geo": "not_available",
+            "input_tokens": 10,
+            "output_tokens": 6,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": "toolu_01XkapD7V36nPRGqQVPTftn3",
+        "request_id": "req_011CduPxPAE1AkT2vMds8zpE",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "task_description": "Extract beta version and owner",
+        "timestamp": "2026-08-10T16:38:28.239Z",
+        "type": "assistant",
+        "uuid": "09a81b7e-7d18-4063-a266-e20a9f69cabf"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "description": "Reading release_notes_beta.md",
+        "last_tool_name": "Read",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "subtype": "task_progress",
+        "task_id": "aa2d67565d2de9f26",
+        "tool_use_id": "toolu_01XkapD7V36nPRGqQVPTftn3",
+        "type": "system",
+        "usage": {
+          "duration_ms": 3304,
+          "tool_uses": 1,
+          "total_tokens": 10340
+        },
+        "uuid": "b5805487-9a63-49e8-b511-f7a18656e9cf"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 1,
+        "estimated_tokens_delta": 1,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "ac62aec4-7977-4851-906a-278324a64e31"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "content": "1\t# Beta Release Notes\n2\t\n3\tversion = 2026.03.11-beta\n4\towner = sdk-platform-beta\n5\t",
+              "tool_use_id": "toolu_01DtuA5PphRpPpmAZs9XjKqH",
               "type": "tool_result"
             }
           ],
-          "role": "user"
+          "role": "user"
+        },
+        "parent_tool_use_id": "toolu_01XkapD7V36nPRGqQVPTftn3",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "task_description": "Extract beta version and owner",
+        "timestamp": "2026-08-10T16:38:28.415Z",
+        "type": "user",
+        "uuid": "b85c0302-7f91-41c5-b4d6-af32c0cc7df2"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "signature": "<REDACTED_SIGNATURE>",
+              "thinking": "Perfect! I can see the file contains:\n- version = 2026.03.11-alpha\n- owner = sdk-platform-alpha\n\nSo the output should be in the format: alpha:<version> | <owner>\n\nThat would be: alpha:2026.03.11-alpha | sdk-platform-alpha\n\nThe user wants ONLY this string, no other text.",
+              "type": "thinking"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxZaY9XZJ7Zmh8syz6",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 671
+            },
+            "cache_creation_input_tokens": 671,
+            "cache_read_input_tokens": 10318,
+            "inference_geo": "not_available",
+            "input_tokens": 8,
+            "output_tokens": 4,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
+        "request_id": "req_011CduPxZ4HW6z63tnZ8HBXE",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "task_description": "Extract alpha version and owner",
+        "timestamp": "2026-08-10T16:38:28.579Z",
+        "type": "assistant",
+        "uuid": "30ce338a-648f-4cb2-97eb-5f18add0834f"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "text": "alpha:2026.03.11-alpha | sdk-platform-alpha",
+              "type": "text"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxZaY9XZJ7Zmh8syz6",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 671
+            },
+            "cache_creation_input_tokens": 671,
+            "cache_read_input_tokens": 10318,
+            "inference_geo": "not_available",
+            "input_tokens": 8,
+            "output_tokens": 4,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
+        "request_id": "req_011CduPxZ4HW6z63tnZ8HBXE",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "task_description": "Extract alpha version and owner",
+        "timestamp": "2026-08-10T16:38:28.580Z",
+        "type": "assistant",
+        "uuid": "fa0b7322-0c8b-47aa-8913-aeff9ec4750b"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "background_tasks_changed",
+        "tasks": [
+          {
+            "description": "Extract beta version and owner",
+            "task_id": "aa2d67565d2de9f26",
+            "task_type": "local_agent"
+          }
+        ],
+        "type": "system",
+        "uuid": "7b203606-c79f-42cc-8bc3-126503471741"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "patch": {
+          "end_time": 1786379908606,
+          "status": "completed"
+        },
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "task_updated",
+        "task_id": "acc13030b342e6516",
+        "type": "system",
+        "uuid": "e32ec718-2e9b-4ba5-9731-07b37e5dc9f5"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "output_file": "<REDACTED_PATH>",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "status": "completed",
+        "subtype": "task_notification",
+        "summary": "alpha:2026.03.11-alpha | sdk-platform-alpha",
+        "task_id": "acc13030b342e6516",
+        "tool_use_id": "toolu_01TcC2KKNvYMkJaHZVunzm7W",
+        "type": "system",
+        "usage": {
+          "duration_ms": 3954,
+          "tool_uses": 1,
+          "total_tokens": 11011
+        },
+        "uuid": "30ba9567-051b-4ea1-95a2-971f4b141a16"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 28,
+        "estimated_tokens_delta": 27,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "4eb86a99-e568-4790-a9b5-b0e3bfa53dd5"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 40,
+        "estimated_tokens_delta": 12,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "ce524b33-00d7-403d-a870-5422d95275d6"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 64,
+        "estimated_tokens_delta": 24,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "cf5e3155-689a-45ea-8041-5b327f9c9c3b"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 126,
+        "estimated_tokens_delta": 62,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "ce53b2f3-4cf6-4690-9c2c-ba71dc74982c"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "signature": "<REDACTED_SIGNATURE>",
+              "thinking": "Good, now I have the TaskOutput tool loaded. I need to wait for both agents to complete. The agent IDs are:\n1. acc13030b342e6516 (alpha)\n2. aa2d67565d2de9f26 (beta)\n\nI'll call TaskOutput with block=true for both agents to wait for them to complete.",
+              "type": "thinking"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxasS4Cm4v56qPkAH5",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 584
+            },
+            "cache_creation_input_tokens": 584,
+            "cache_read_input_tokens": 13128,
+            "inference_geo": "not_available",
+            "input_tokens": 10,
+            "output_tokens": 1,
+            "service_tier": "standard"
+          }
         },
         "parent_tool_use_id": null,
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "timestamp": "2026-05-19T14:53:04.227Z",
-        "tool_use_result": {
-          "agentId": "a4e4e0ab3cf303af7",
-          "agentType": "general-purpose",
+        "request_id": "req_011CduPxZmTBjZCpFQeR2kJV",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:29.363Z",
+        "type": "assistant",
+        "uuid": "ccbab299-8640-4f94-a515-14c267014080"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
           "content": [
             {
-              "text": "alpha:2026.03.11-alpha | sdk-platform-alpha",
-              "type": "text"
+              "caller": {
+                "type": "direct"
+              },
+              "id": "toolu_01U1faYuYGzjHERBczX2o2tS",
+              "input": {
+                "block": true,
+                "task_id": "acc13030b342e6516",
+                "timeout": 30000
+              },
+              "name": "TaskOutput",
+              "type": "tool_use"
             }
           ],
-          "prompt": "Read the file release_notes_alpha.md using the Read tool. Extract and return ONLY the version and owner in the format: 'alpha:<version> | <owner>'. Do not include any other text or explanation.",
-          "status": "completed",
-          "toolStats": {
-            "bashCount": 0,
-            "editFileCount": 0,
-            "linesAdded": 0,
-            "linesRemoved": 0,
-            "otherToolCount": 0,
-            "readCount": 1,
-            "searchCount": 0
-          },
-          "totalDurationMs": 3644,
-          "totalTokens": 18034,
-          "totalToolUseCount": 1,
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxasS4Cm4v56qPkAH5",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 192
+              "ephemeral_5m_input_tokens": 584
             },
-            "cache_creation_input_tokens": 192,
-            "cache_read_input_tokens": 17817,
-            "inference_geo": "",
-            "input_tokens": 6,
-            "iterations": [
-              {
-                "cache_creation": {
-                  "ephemeral_1h_input_tokens": 0,
-                  "ephemeral_5m_input_tokens": 192
-                },
-                "cache_creation_input_tokens": 192,
-                "cache_read_input_tokens": 17817,
-                "input_tokens": 6,
-                "output_tokens": 19,
-                "type": "message"
-              }
-            ],
-            "output_tokens": 19,
-            "server_tool_use": {
-              "web_fetch_requests": 0,
-              "web_search_requests": 0
-            },
-            "service_tier": "standard",
-            "speed": "standard"
+            "cache_creation_input_tokens": 584,
+            "cache_read_input_tokens": 13128,
+            "inference_geo": "not_available",
+            "input_tokens": 10,
+            "output_tokens": 1,
+            "service_tier": "standard"
           }
         },
-        "type": "user",
-        "uuid": "332fc825-fac6-4773-b776-a2ced04323e7"
+        "parent_tool_use_id": null,
+        "request_id": "req_011CduPxZmTBjZCpFQeR2kJV",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:29.684Z",
+        "type": "assistant",
+        "uuid": "cb7c115c-a7d6-4fe1-b1af-7f359f71399d"
       }
     },
     {
       "op": "read",
       "payload": {
-        "output_file": "",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "status": "completed",
-        "subtype": "task_notification",
-        "summary": "Extract beta version and owner",
-        "task_id": "a5d4959a2c92999f6",
-        "tool_use_id": "toolu_01UyhHgNEXve8Z5eZ4ebw7fb",
-        "type": "system",
-        "usage": {
-          "duration_ms": 3630,
-          "tool_uses": 1,
-          "total_tokens": 18024
+        "message": {
+          "content": [
+            {
+              "caller": {
+                "type": "direct"
+              },
+              "id": "toolu_01AwEKEBtpbHo8r1iTNerXf2",
+              "input": {
+                "block": true,
+                "task_id": "aa2d67565d2de9f26",
+                "timeout": 30000
+              },
+              "name": "TaskOutput",
+              "type": "tool_use"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxasS4Cm4v56qPkAH5",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 584
+            },
+            "cache_creation_input_tokens": 584,
+            "cache_read_input_tokens": 13128,
+            "inference_geo": "not_available",
+            "input_tokens": 10,
+            "output_tokens": 1,
+            "service_tier": "standard"
+          }
         },
-        "uuid": "e6206687-1a13-4c93-b748-32c8c1f8b248"
+        "parent_tool_use_id": null,
+        "request_id": "req_011CduPxZmTBjZCpFQeR2kJV",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:29.867Z",
+        "type": "assistant",
+        "uuid": "4cb5f6d4-89d8-49c4-988a-5faa43d57536"
       }
     },
     {
@@ -662,81 +1448,247 @@
         "message": {
           "content": [
             {
-              "content": [
-                {
-                  "text": "beta:2026.03.11-beta | sdk-platform-beta",
-                  "type": "text"
-                },
-                {
-                  "text": "agentId: a5d4959a2c92999f6 (use SendMessage with to: 'a5d4959a2c92999f6' to continue this agent)\n<usage>total_tokens: 18032\ntool_uses: 1\nduration_ms: 3630</usage>",
-                  "type": "text"
-                }
-              ],
-              "tool_use_id": "toolu_01UyhHgNEXve8Z5eZ4ebw7fb",
+              "content": "<retrieval_status>success</retrieval_status>\n\n<task_id>acc13030b342e6516</task_id>\n\n<task_type>local_agent</task_type>\n\n<status>completed</status>\n\n<output>\nalpha:2026.03.11-alpha | sdk-platform-alpha\n</output>",
+              "tool_use_id": "toolu_01U1faYuYGzjHERBczX2o2tS",
               "type": "tool_result"
             }
           ],
           "role": "user"
         },
         "parent_tool_use_id": null,
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
-        "timestamp": "2026-05-19T14:53:04.446Z",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:29.893Z",
         "tool_use_result": {
-          "agentId": "a5d4959a2c92999f6",
-          "agentType": "general-purpose",
+          "retrieval_status": "success",
+          "task": {
+            "description": "Extract alpha version and owner",
+            "isRawTranscript": false,
+            "output": "alpha:2026.03.11-alpha | sdk-platform-alpha",
+            "prompt": "Read the file release_notes_alpha.md and extract the version and owner. Return ONLY the string in this format: alpha:<version> | <owner>\n\nExample output: alpha:1.2.3 | john-doe\n\nDo not include any other text or explanation.",
+            "result": "alpha:2026.03.11-alpha | sdk-platform-alpha",
+            "status": "completed",
+            "task_id": "acc13030b342e6516",
+            "task_type": "local_agent"
+          }
+        },
+        "type": "user",
+        "uuid": "4d0458a6-fda3-480e-a128-e9d605ffcad9"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "signature": "<REDACTED_SIGNATURE>",
+              "thinking": "Great! I found the file. Now I can extract the version and owner:\n\n- version = 2026.03.11-beta\n- owner = sdk-platform-beta\n\nThe user wants the format: beta:<version> | <owner>\n\nSo the output should be: beta:2026.03.11-beta | sdk-platform-beta\n\nThe user specifically said \"Do not include any other text or explanation\" - so I should only return that line.",
+              "type": "thinking"
+            }
+          ],
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxeL3ZFB6MMjA6XfCb",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
+          "usage": {
+            "cache_creation": {
+              "ephemeral_1h_input_tokens": 0,
+              "ephemeral_5m_input_tokens": 786
+            },
+            "cache_creation_input_tokens": 786,
+            "cache_read_input_tokens": 10318,
+            "inference_geo": "not_available",
+            "input_tokens": 8,
+            "output_tokens": 8,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": "toolu_01XkapD7V36nPRGqQVPTftn3",
+        "request_id": "req_011CduPxdK27HoJgsdz2Bhtz",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "task_description": "Extract beta version and owner",
+        "timestamp": "2026-08-10T16:38:30.106Z",
+        "type": "assistant",
+        "uuid": "2724e37f-7c1c-42ef-a703-712946236d13"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
           "content": [
             {
               "text": "beta:2026.03.11-beta | sdk-platform-beta",
               "type": "text"
             }
           ],
-          "prompt": "Read the file release_notes_beta.md using the Read tool. Extract and return ONLY the version and owner in the format: 'beta:<version> | <owner>'. Do not include any other text or explanation.",
-          "status": "completed",
-          "toolStats": {
-            "bashCount": 0,
-            "editFileCount": 0,
-            "linesAdded": 0,
-            "linesRemoved": 0,
-            "otherToolCount": 0,
-            "readCount": 1,
-            "searchCount": 0
-          },
-          "totalDurationMs": 3630,
-          "totalTokens": 18032,
-          "totalToolUseCount": 1,
+          "context_management": null,
+          "diagnostics": null,
+          "id": "msg_011CduPxeL3ZFB6MMjA6XfCb",
+          "model": "claude-haiku-4-5-20251001",
+          "role": "assistant",
+          "stop_details": null,
+          "stop_reason": null,
+          "stop_sequence": null,
+          "type": "message",
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 190
+              "ephemeral_5m_input_tokens": 786
             },
-            "cache_creation_input_tokens": 190,
-            "cache_read_input_tokens": 17817,
-            "inference_geo": "",
-            "input_tokens": 6,
-            "iterations": [
-              {
-                "cache_creation": {
-                  "ephemeral_1h_input_tokens": 0,
-                  "ephemeral_5m_input_tokens": 190
-                },
-                "cache_creation_input_tokens": 190,
-                "cache_read_input_tokens": 17817,
-                "input_tokens": 6,
-                "output_tokens": 19,
-                "type": "message"
-              }
-            ],
-            "output_tokens": 19,
-            "server_tool_use": {
-              "web_fetch_requests": 0,
-              "web_search_requests": 0
-            },
-            "service_tier": "standard",
-            "speed": "standard"
+            "cache_creation_input_tokens": 786,
+            "cache_read_input_tokens": 10318,
+            "inference_geo": "not_available",
+            "input_tokens": 8,
+            "output_tokens": 8,
+            "service_tier": "standard"
+          }
+        },
+        "parent_tool_use_id": "toolu_01XkapD7V36nPRGqQVPTftn3",
+        "request_id": "req_011CduPxdK27HoJgsdz2Bhtz",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subagent_type": "general-purpose",
+        "task_description": "Extract beta version and owner",
+        "timestamp": "2026-08-10T16:38:30.169Z",
+        "type": "assistant",
+        "uuid": "47326b37-89e0-4417-bb99-15ac9f92bfc7"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "background_tasks_changed",
+        "tasks": [],
+        "type": "system",
+        "uuid": "8db467d7-60c2-4f9a-81f1-a7a78ba91a8c"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "patch": {
+          "end_time": 1786379910367,
+          "status": "completed"
+        },
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "task_updated",
+        "task_id": "aa2d67565d2de9f26",
+        "type": "system",
+        "uuid": "7e1c0898-28d4-4fa8-a7db-0ae3da7dfa87"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "output_file": "<REDACTED_PATH>",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "status": "completed",
+        "subtype": "task_notification",
+        "summary": "beta:2026.03.11-beta | sdk-platform-beta",
+        "task_id": "aa2d67565d2de9f26",
+        "tool_use_id": "toolu_01XkapD7V36nPRGqQVPTftn3",
+        "type": "system",
+        "usage": {
+          "duration_ms": 5431,
+          "tool_uses": 1,
+          "total_tokens": 11140
+        },
+        "uuid": "cb51f637-258d-4b01-b665-19cdd9cd7304"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "message": {
+          "content": [
+            {
+              "content": "<retrieval_status>success</retrieval_status>\n\n<task_id>aa2d67565d2de9f26</task_id>\n\n<task_type>local_agent</task_type>\n\n<status>completed</status>\n\n<output>\nbeta:2026.03.11-beta | sdk-platform-beta\n</output>",
+              "tool_use_id": "toolu_01AwEKEBtpbHo8r1iTNerXf2",
+              "type": "tool_result"
+            }
+          ],
+          "role": "user"
+        },
+        "parent_tool_use_id": null,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:30.562Z",
+        "tool_use_result": {
+          "retrieval_status": "success",
+          "task": {
+            "description": "Extract beta version and owner",
+            "isRawTranscript": false,
+            "output": "beta:2026.03.11-beta | sdk-platform-beta",
+            "prompt": "Read the file release_notes_beta.md and extract the version and owner. Return ONLY the string in this format: beta:<version> | <owner>\n\nExample output: beta:2.0.0 | jane-smith\n\nDo not include any other text or explanation.",
+            "result": "beta:2026.03.11-beta | sdk-platform-beta",
+            "status": "completed",
+            "task_id": "aa2d67565d2de9f26",
+            "task_type": "local_agent"
           }
         },
         "type": "user",
-        "uuid": "83a8e035-9768-4e30-9eca-42282ee2f387"
+        "uuid": "a2819fb6-e519-469f-bc55-fe9794efbf43"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 4,
+        "estimated_tokens_delta": 4,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "5c455482-d05f-4853-b326-db22f0e56f27"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 34,
+        "estimated_tokens_delta": 30,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "07ebebc0-a5dc-4cc8-a1c3-a950edbe71d9"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 58,
+        "estimated_tokens_delta": 24,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "7efb069f-df39-4bc3-82f8-cc56fb956ad1"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 64,
+        "estimated_tokens_delta": 6,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "18e499d1-343b-4b2a-b3db-7efd2d16a289"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 126,
+        "estimated_tokens_delta": 62,
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "a02dc0d1-bbf9-4da4-94ef-50209af45554"
       }
     },
     {
@@ -746,13 +1698,13 @@
           "content": [
             {
               "signature": "<REDACTED_SIGNATURE>",
-              "thinking": "Perfect! Both agents have completed their tasks and returned the results in the exact format requested. Now I need to output exactly two lines in the order they were requested:\n\n1. alpha:2026.03.11-alpha | sdk-platform-alpha\n2. beta:2026.03.11-beta | sdk-platform-beta",
+              "thinking": "Perfect! Both agents have completed successfully. I have the results:\n1. alpha:2026.03.11-alpha | sdk-platform-alpha\n2. beta:2026.03.11-beta | sdk-platform-beta\n\nNow I need to reply with exactly two lines in that same order, as requested by the user.",
               "type": "thinking"
             }
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_015J2dRUKbMVUiKNgbQfCsEP",
+          "id": "msg_011CduPxo1gNLNavMzLF9wvX",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -762,21 +1714,22 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 663
+              "ephemeral_5m_input_tokens": 1388
             },
-            "cache_creation_input_tokens": 663,
-            "cache_read_input_tokens": 23765,
+            "cache_creation_input_tokens": 1388,
+            "cache_read_input_tokens": 13712,
             "inference_geo": "not_available",
             "input_tokens": 8,
-            "output_tokens": 6,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7nTmJhJ4Fuw4g7j4e1",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "request_id": "req_011CduPxnTSW2XZ7VkrWRWyi",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:32.006Z",
         "type": "assistant",
-        "uuid": "05e6e861-a221-4ab5-9cad-0eb32efd7e97"
+        "uuid": "5ef8a7ae-fea4-4fbd-85f7-50bbe895ed25"
       }
     },
     {
@@ -791,7 +1744,7 @@
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_015J2dRUKbMVUiKNgbQfCsEP",
+          "id": "msg_011CduPxo1gNLNavMzLF9wvX",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -801,76 +1754,82 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 663
+              "ephemeral_5m_input_tokens": 1388
             },
-            "cache_creation_input_tokens": 663,
-            "cache_read_input_tokens": 23765,
+            "cache_creation_input_tokens": 1388,
+            "cache_read_input_tokens": 13712,
             "inference_geo": "not_available",
             "input_tokens": 8,
-            "output_tokens": 6,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7nTmJhJ4Fuw4g7j4e1",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "request_id": "req_011CduPxnTSW2XZ7VkrWRWyi",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
+        "timestamp": "2026-08-10T16:38:32.008Z",
         "type": "assistant",
-        "uuid": "5ac47ee3-9a80-4e27-818b-a9ee61003134"
+        "uuid": "9a245758-0c0b-412c-b47c-9fe2c30d2085"
       }
     },
     {
       "op": "read",
       "payload": {
         "api_error_status": null,
-        "duration_api_ms": 13622,
-        "duration_ms": 8954,
+        "duration_api_ms": 19028,
+        "duration_ms": 11270,
+        "fast_mode_disabled_reason": "sdk_opt_in_required",
         "fast_mode_state": "off",
         "is_error": false,
         "modelUsage": {
           "claude-haiku-4-5-20251001": {
-            "cacheCreationInputTokens": 60444,
-            "cacheReadInputTokens": 59399,
+            "cacheCreationInputTokens": 12769,
+            "cacheReadInputTokens": 83780,
+            "canonicalModel": "claude-haiku-4-5",
             "contextWindow": 200000,
-            "costUSD": 0.08642690000000001,
-            "inputTokens": 602,
+            "costUSD": 0.033231250000000004,
+            "inputTokens": 72,
             "maxOutputTokens": 32000,
-            "outputTokens": 866,
+            "outputTokens": 1764,
+            "provider": "firstParty",
             "webSearchRequests": 0
           }
         },
-        "num_turns": 3,
+        "num_turns": 6,
         "permission_denials": [],
         "result": "alpha:2026.03.11-alpha | sdk-platform-alpha\nbeta:2026.03.11-beta | sdk-platform-beta",
-        "session_id": "9390888b-4e10-44b7-aafa-cf339cf620c8",
+        "session_id": "37f2cd76-234e-4c18-93fd-d1455c5036ba",
         "stop_reason": "end_turn",
         "subtype": "success",
         "terminal_reason": "completed",
-        "total_cost_usd": 0.08642690000000001,
-        "ttft_ms": 3093,
+        "time_to_request_ms": 143,
+        "total_cost_usd": 0.033231250000000004,
+        "ttft_ms": 2402,
+        "ttft_stream_ms": 1114,
         "type": "result",
         "usage": {
           "cache_creation": {
             "ephemeral_1h_input_tokens": 0,
-            "ephemeral_5m_input_tokens": 24428
+            "ephemeral_5m_input_tokens": 5790
           },
-          "cache_creation_input_tokens": 24428,
-          "cache_read_input_tokens": 23765,
-          "inference_geo": "",
-          "input_tokens": 18,
+          "cache_creation_input_tokens": 5790,
+          "cache_read_input_tokens": 48030,
+          "inference_geo": "not_available",
+          "input_tokens": 36,
           "iterations": [
             {
               "cache_creation": {
                 "ephemeral_1h_input_tokens": 0,
-                "ephemeral_5m_input_tokens": 663
+                "ephemeral_5m_input_tokens": 1388
               },
-              "cache_creation_input_tokens": 663,
-              "cache_read_input_tokens": 23765,
+              "cache_creation_input_tokens": 1388,
+              "cache_read_input_tokens": 13712,
               "input_tokens": 8,
-              "output_tokens": 115,
+              "output_tokens": 116,
               "type": "message"
             }
           ],
-          "output_tokens": 520,
+          "output_tokens": 1012,
           "server_tool_use": {
             "web_fetch_requests": 0,
             "web_search_requests": 0
@@ -878,9 +1837,9 @@
           "service_tier": "standard",
           "speed": "standard"
         },
-        "uuid": "89727a5e-d984-4a9f-88ed-d3ea06cbaccb"
+        "uuid": "f6826610-5dbe-45aa-86f0-1f8c0d671913"
       }
     }
   ],
-  "sdk_version": "0.2.82"
+  "sdk_version": "0.2.129"
 }
diff --git a/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_user_prompt_submit_hook_creates_function_span.json b/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_user_prompt_submit_hook_creates_function_span.json
index c37756a3d..c16df5056 100644
--- a/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_user_prompt_submit_hook_creates_function_span.json
+++ b/py/src/braintrust/integrations/claude_agent_sdk/cassettes/latest/test_user_prompt_submit_hook_creates_function_span.json
@@ -19,21 +19,50 @@
             },
             "subtype": "initialize"
           },
-          "request_id": "req_1_c065fa36",
+          "request_id": "req_1_03b62051",
           "type": "control_request"
         }
       }
     },
+    {
+      "op": "read",
+      "payload": {
+        "hook_event": "SessionStart",
+        "hook_id": "aeb6c325-0578-441b-bcb6-44dbbe309c5e",
+        "hook_name": "SessionStart:startup",
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
+        "subtype": "hook_started",
+        "type": "system",
+        "uuid": "c5aa4b0c-3d65-4cc4-8fbf-0621207f4321"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "exit_code": 0,
+        "hook_event": "SessionStart",
+        "hook_id": "aeb6c325-0578-441b-bcb6-44dbbe309c5e",
+        "hook_name": "SessionStart:startup",
+        "outcome": "success",
+        "output": "",
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
+        "stderr": "",
+        "stdout": "",
+        "subtype": "hook_response",
+        "type": "system",
+        "uuid": "5e70c37a-81ca-4c65-9652-74f1c50d43b7"
+      }
+    },
     {
       "op": "read",
       "payload": {
         "response": {
-          "request_id": "req_1_c065fa36",
+          "request_id": "req_1_03b62051",
           "response": {
             "account": {
               "apiKeySource": "ANTHROPIC_API_KEY",
               "apiProvider": "firstParty",
-              "tokenSource": "none"
+              "tokenSource": "claude.ai"
             },
             "agents": [],
             "available_output_styles": [],
@@ -70,13 +99,14 @@
             "hook_event_name": "UserPromptSubmit",
             "permission_mode": "bypassPermissions",
             "prompt": "Say hello in one short sentence.",
-            "session_id": "c6b8f60e-80a7-4b13-b770-331510ea4fd0",
-            "transcript_path": "<REDACTED_PATH>"
+            "prompt_id": "48396d1a-48d3-423e-a548-7c2a31c5b992",
+            "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
+            "transcript_path": "TRANSCRIPT_0"
           },
           "subtype": "hook_callback",
-          "tool_use_id": "100c74a3-aa55-4aff-b89d-8ec48528a3b7"
+          "tool_use_id": "59895247-9216-4468-b76f-c6ce1f562728"
         },
-        "request_id": "37567e48-5d59-4333-b1bd-090c7fdca6d7",
+        "request_id": "5345f1f1-1317-4afd-8861-b654134a7493",
         "type": "control_request"
       }
     },
@@ -86,7 +116,7 @@
         "kind": "json",
         "value": {
           "response": {
-            "request_id": "37567e48-5d59-4333-b1bd-090c7fdca6d7",
+            "request_id": "5345f1f1-1317-4afd-8861-b654134a7493",
             "response": {
               "hookSpecificOutput": {
                 "additionalContext": "Remember the answer should stay concise.",
@@ -111,14 +141,16 @@
         ],
         "analytics_disabled": false,
         "apiKeySource": "ANTHROPIC_API_KEY",
-        "claude_code_version": "2.1.142",
+        "capabilities": [
+          "interrupt_receipt_v1",
+          "interrupt_cancel_queued_v1",
+          "msg_lifecycle_v1"
+        ],
+        "claude_code_version": "2.1.221",
         "cwd": "<REDACTED_CWD>",
+        "fast_mode_disabled_reason": "sdk_opt_in_required",
         "fast_mode_state": "off",
         "mcp_servers": [
-          {
-            "name": "braintrust",
-            "status": "connected"
-          },
           {
             "name": "linear-server",
             "status": "connected"
@@ -134,78 +166,107 @@
           {
             "name": "rust-analyzer-lsp",
             "path": "<REDACTED_PATH>",
-            "source": "rust-analyzer-lsp@claude-plugins-official"
+            "source": "rust-analyzer-lsp@claude-plugins-official",
+            "version": "1.0.0"
           }
         ],
-        "session_id": "c6b8f60e-80a7-4b13-b770-331510ea4fd0",
+        "product_feedback_disabled": false,
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
         "skills": [
-          "create-braintrust-demo",
           "braintrust",
+          "create-braintrust-demo",
+          "commit-message",
+          "sdk-benchmarking",
+          "sdk-ci-triage",
           "sdk-dependency-updates",
           "sdk-integrations",
           "sdk-vcr-workflows",
-          "sdk-ci-triage",
-          "commit-message",
-          "sdk-benchmarking",
+          "design-sync",
+          "dataviz",
           "update-config",
+          "verify",
           "debug",
+          "code-review",
           "simplify",
           "batch",
           "fewer-permission-prompts",
+          "doctor",
           "loop",
-          "claude-api"
+          "claude-api",
+          "run",
+          "run-skill-generator"
         ],
         "slash_commands": [
-          "create-braintrust-demo",
           "braintrust",
+          "create-braintrust-demo",
+          "commit-message",
+          "sdk-benchmarking",
+          "sdk-ci-triage",
           "sdk-dependency-updates",
           "sdk-integrations",
           "sdk-vcr-workflows",
-          "sdk-ci-triage",
-          "commit-message",
-          "sdk-benchmarking",
+          "design-sync",
+          "dataviz",
           "update-config",
+          "verify",
           "debug",
+          "code-review",
           "simplify",
           "batch",
           "fewer-permission-prompts",
+          "doctor",
           "loop",
           "claude-api",
+          "run",
+          "run-skill-generator",
+          "agents",
+          "autocompact",
           "clear",
+          "color",
           "compact",
+          "config",
           "context",
+          "effort",
+          "fast",
           "heapdump",
           "init",
+          "mcp",
+          "import",
+          "model",
+          "__remote-workflow",
+          "workflow-launch-exec",
+          "reload-skills",
+          "rename",
           "review",
           "security-review",
           "usage",
           "insights",
+          "recap",
           "goal",
+          "design",
+          "design-consent",
+          "design-revoke",
           "team-onboarding"
         ],
         "subtype": "init",
         "tools": [
           "Task",
-          "AskUserQuestion",
           "Bash",
           "CronCreate",
           "CronDelete",
           "CronList",
+          "DesignSync",
           "Edit",
-          "EnterPlanMode",
           "EnterWorktree",
-          "ExitPlanMode",
           "ExitWorktree",
-          "Glob",
-          "Grep",
-          "ListMcpResourcesTool",
           "LSP",
           "Monitor",
           "NotebookEdit",
           "PushNotification",
           "Read",
-          "ReadMcpResourceTool",
+          "ReportFindings",
           "ScheduleWakeup",
+          "SendMessage",
           "Skill",
           "TaskCreate",
           "TaskGet",
@@ -217,22 +278,18 @@
           "WebFetch",
           "WebSearch",
           "Write",
-          "mcp__braintrust__generate_permalink",
-          "mcp__braintrust__infer_schema",
-          "mcp__braintrust__list_recent_objects",
-          "mcp__braintrust__resolve_object",
-          "mcp__braintrust__search_docs",
-          "mcp__braintrust__sql_query",
-          "mcp__braintrust__summarize_experiment",
           "mcp__linear-server__create_attachment",
           "mcp__linear-server__create_attachment_from_upload",
+          "mcp__linear-server__create_initiative_label",
           "mcp__linear-server__create_issue_label",
           "mcp__linear-server__delete_attachment",
           "mcp__linear-server__delete_comment",
           "mcp__linear-server__delete_customer",
           "mcp__linear-server__delete_customer_need",
+          "mcp__linear-server__delete_diff_comment",
           "mcp__linear-server__delete_status_update",
           "mcp__linear-server__extract_images",
+          "mcp__linear-server__get_agent_skill",
           "mcp__linear-server__get_attachment",
           "mcp__linear-server__get_diff",
           "mcp__linear-server__get_diff_threads",
@@ -242,14 +299,19 @@
           "mcp__linear-server__get_issue_status",
           "mcp__linear-server__get_milestone",
           "mcp__linear-server__get_project",
+          "mcp__linear-server__get_release",
+          "mcp__linear-server__get_release_note",
           "mcp__linear-server__get_status_updates",
           "mcp__linear-server__get_team",
           "mcp__linear-server__get_user",
+          "mcp__linear-server__get_workspace",
+          "mcp__linear-server__list_agent_skills",
           "mcp__linear-server__list_comments",
           "mcp__linear-server__list_customers",
           "mcp__linear-server__list_cycles",
           "mcp__linear-server__list_diffs",
           "mcp__linear-server__list_documents",
+          "mcp__linear-server__list_initiative_labels",
           "mcp__linear-server__list_initiatives",
           "mcp__linear-server__list_issue_labels",
           "mcp__linear-server__list_issue_statuses",
@@ -257,22 +319,75 @@
           "mcp__linear-server__list_milestones",
           "mcp__linear-server__list_project_labels",
           "mcp__linear-server__list_projects",
+          "mcp__linear-server__list_release_notes",
+          "mcp__linear-server__list_release_pipelines",
+          "mcp__linear-server__list_releases",
           "mcp__linear-server__list_teams",
           "mcp__linear-server__list_users",
+          "mcp__linear-server__merge_diff",
           "mcp__linear-server__prepare_attachment_upload",
+          "mcp__linear-server__resolve_diff_thread",
           "mcp__linear-server__save_comment",
           "mcp__linear-server__save_customer",
           "mcp__linear-server__save_customer_need",
+          "mcp__linear-server__save_diff_comment",
           "mcp__linear-server__save_document",
           "mcp__linear-server__save_initiative",
           "mcp__linear-server__save_issue",
           "mcp__linear-server__save_milestone",
           "mcp__linear-server__save_project",
+          "mcp__linear-server__save_release",
+          "mcp__linear-server__save_release_note",
           "mcp__linear-server__save_status_update",
-          "mcp__linear-server__search_documentation"
+          "mcp__linear-server__search_documentation",
+          "mcp__linear-server__submit_diff_review"
         ],
         "type": "system",
-        "uuid": "f17dade9-e2b7-4428-b8c8-204e8d49dacf"
+        "uuid": "96637df0-4ce5-454d-8ef2-f208ee618002"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 3,
+        "estimated_tokens_delta": 3,
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "99ff8068-7b8d-4698-a4c9-d414a3d503fb"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 8,
+        "estimated_tokens_delta": 5,
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "d6381bd8-a359-484e-a557-5e9677cd8b5c"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 35,
+        "estimated_tokens_delta": 27,
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "06f2594b-c573-4b25-8c1c-ffd7054b9bbc"
+      }
+    },
+    {
+      "op": "read",
+      "payload": {
+        "estimated_tokens": 97,
+        "estimated_tokens_delta": 62,
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
+        "subtype": "thinking_tokens",
+        "type": "system",
+        "uuid": "7ec9dcd5-c15f-47df-be84-5cb3ef671ed0"
       }
     },
     {
@@ -282,13 +397,13 @@
           "content": [
             {
               "signature": "<REDACTED_SIGNATURE>",
-              "thinking": "The user is asking me to say hello in one short sentence. This is a very simple request. I should provide a brief greeting.",
+              "thinking": "The user is asking me to say hello in one short sentence. This is a simple greeting request. I should respond briefly and courteously.",
               "type": "thinking"
             }
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01PBVTQmKiV2TW6SwGDr93cc",
+          "id": "msg_011CduPywRUPsNNJnSqm4CBT",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -298,21 +413,22 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 44572
+              "ephemeral_5m_input_tokens": 7957
             },
-            "cache_creation_input_tokens": 44572,
-            "cache_read_input_tokens": 0,
+            "cache_creation_input_tokens": 7957,
+            "cache_read_input_tokens": 9310,
             "inference_geo": "not_available",
             "input_tokens": 10,
-            "output_tokens": 7,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7WRWBU7Lg6co2KK6k9",
-        "session_id": "c6b8f60e-80a7-4b13-b770-331510ea4fd0",
+        "request_id": "req_011CduPyvvTbwELYfY2MCf9W",
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
+        "timestamp": "2026-08-10T16:38:47.080Z",
         "type": "assistant",
-        "uuid": "1f66b247-77c6-490b-bcc5-52282c23a736"
+        "uuid": "3f8cbdd9-8fb0-44c5-a0c4-5e0e42c56216"
       }
     },
     {
@@ -321,13 +437,13 @@
         "message": {
           "content": [
             {
-              "text": "Hello! I'm ready to help you with Braintrust SDK development or other tasks.",
+              "text": "Hello! I'm Claude, and I'm ready to help you with your Braintrust SDK work.",
               "type": "text"
             }
           ],
           "context_management": null,
           "diagnostics": null,
-          "id": "msg_01PBVTQmKiV2TW6SwGDr93cc",
+          "id": "msg_011CduPywRUPsNNJnSqm4CBT",
           "model": "claude-haiku-4-5-20251001",
           "role": "assistant",
           "stop_details": null,
@@ -337,76 +453,82 @@
           "usage": {
             "cache_creation": {
               "ephemeral_1h_input_tokens": 0,
-              "ephemeral_5m_input_tokens": 44572
+              "ephemeral_5m_input_tokens": 7957
             },
-            "cache_creation_input_tokens": 44572,
-            "cache_read_input_tokens": 0,
+            "cache_creation_input_tokens": 7957,
+            "cache_read_input_tokens": 9310,
             "inference_geo": "not_available",
             "input_tokens": 10,
-            "output_tokens": 7,
+            "output_tokens": 3,
             "service_tier": "standard"
           }
         },
         "parent_tool_use_id": null,
-        "request_id": "req_011CbC7WRWBU7Lg6co2KK6k9",
-        "session_id": "c6b8f60e-80a7-4b13-b770-331510ea4fd0",
+        "request_id": "req_011CduPyvvTbwELYfY2MCf9W",
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
+        "timestamp": "2026-08-10T16:38:47.084Z",
         "type": "assistant",
-        "uuid": "467d8d4b-0ed5-4d28-91e2-a4802d75498a"
+        "uuid": "f41ed6fb-5cd0-4c77-a157-e66cd5f9aaae"
       }
     },
     {
       "op": "read",
       "payload": {
         "api_error_status": null,
-        "duration_api_ms": 3996,
-        "duration_ms": 2960,
+        "duration_api_ms": 1149,
+        "duration_ms": 1437,
+        "fast_mode_disabled_reason": "sdk_opt_in_required",
         "fast_mode_state": "off",
         "is_error": false,
         "modelUsage": {
           "claude-haiku-4-5-20251001": {
-            "cacheCreationInputTokens": 44572,
-            "cacheReadInputTokens": 0,
+            "cacheCreationInputTokens": 7957,
+            "cacheReadInputTokens": 9310,
+            "canonicalModel": "claude-haiku-4-5",
             "contextWindow": 200000,
-            "costUSD": 0.056518,
-            "inputTokens": 453,
+            "costUSD": 0.01119725,
+            "inputTokens": 10,
             "maxOutputTokens": 32000,
-            "outputTokens": 70,
+            "outputTokens": 62,
+            "provider": "firstParty",
             "webSearchRequests": 0
           }
         },
         "num_turns": 1,
         "permission_denials": [],
-        "result": "Hello! I'm ready to help you with Braintrust SDK development or other tasks.",
-        "session_id": "c6b8f60e-80a7-4b13-b770-331510ea4fd0",
+        "result": "Hello! I'm Claude, and I'm ready to help you with your Braintrust SDK work.",
+        "session_id": "9f08ea13-a7ed-4b10-991e-bfdcb8860166",
         "stop_reason": "end_turn",
         "subtype": "success",
         "terminal_reason": "completed",
-        "total_cost_usd": 0.056518,
-        "ttft_ms": 2900,
+        "time_to_request_ms": 114,
+        "total_cost_usd": 0.01119725,
+        "ttft_ms": 1248,
+        "ttft_stream_ms": 883,
         "type": "result",
         "usage": {
           "cache_creation": {
             "ephemeral_1h_input_tokens": 0,
-            "ephemeral_5m_input_tokens": 44572
+            "ephemeral_5m_input_tokens": 7957
           },
-          "cache_creation_input_tokens": 44572,
-          "cache_read_input_tokens": 0,
-          "inference_geo": "",
+          "cache_creation_input_tokens": 7957,
+          "cache_read_input_tokens": 9310,
+          "inference_geo": "not_available",
           "input_tokens": 10,
           "iterations": [
             {
               "cache_creation": {
                 "ephemeral_1h_input_tokens": 0,
-                "ephemeral_5m_input_tokens": 44572
+                "ephemeral_5m_input_tokens": 7957
               },
-              "cache_creation_input_tokens": 44572,
-              "cache_read_input_tokens": 0,
+              "cache_creation_input_tokens": 7957,
+              "cache_read_input_tokens": 9310,
               "input_tokens": 10,
-              "output_tokens": 57,
+              "output_tokens": 62,
               "type": "message"
             }
           ],
-          "output_tokens": 57,
+          "output_tokens": 62,
           "server_tool_use": {
             "web_fetch_requests": 0,
             "web_search_requests": 0
@@ -414,9 +536,9 @@
           "service_tier": "standard",
           "speed": "standard"
         },
-        "uuid": "de0dea47-6c17-4191-9685-06725bcc8834"
+        "uuid": "28a477a9-740d-47d6-8688-5b681936d62f"
       }
     }
   ],
-  "sdk_version": "0.2.82"
+  "sdk_version": "0.2.129"
 }
diff --git a/py/src/braintrust/integrations/claude_agent_sdk/test_claude_agent_sdk.py b/py/src/braintrust/integrations/claude_agent_sdk/test_claude_agent_sdk.py
index 982497374..c35df9b10 100644
--- a/py/src/braintrust/integrations/claude_agent_sdk/test_claude_agent_sdk.py
+++ b/py/src/braintrust/integrations/claude_agent_sdk/test_claude_agent_sdk.py
@@ -2,6 +2,7 @@
 
 import asyncio
 import contextvars
+import copy
 import dataclasses
 import sys
 import types
@@ -31,8 +32,10 @@
 from braintrust.integrations.claude_agent_sdk.tracing import (
     ContextTracker,
     ToolSpanTracker,
+    _aggregate_model_usage,
     _build_llm_input,
     _create_client_wrapper_class,
+    _create_query_wrapper_function,
     _create_tool_wrapper_class,
     _parse_tool_name,
     _serialize_content_blocks,
@@ -51,6 +54,16 @@
 REPO_ROOT = Path(__file__).resolve().parents[5]  # py/src/braintrust/integrations/claude_agent_sdk -> repo root
 
 
+async def _concise_user_prompt_hook(input_data: Any, tool_use_id: str | None, context: Any) -> dict[str, Any]:
+    del input_data, tool_use_id, context
+    return {
+        "hookSpecificOutput": {
+            "hookEventName": "UserPromptSubmit",
+            "additionalContext": "Remember the answer should stay concise.",
+        }
+    }
+
+
 @pytest.fixture
 def memory_logger():
     """Memory-based logger for testing span creation."""
@@ -100,6 +113,7 @@ def _make_calculator_options(handler: Any) -> Any:
     return claude_agent_sdk.ClaudeAgentOptions(
         model=TEST_MODEL,
         permission_mode="bypassPermissions",
+        include_partial_messages=True,
         mcp_servers={
             "calculator": claude_agent_sdk.create_sdk_mcp_server(
                 name="calculator",
@@ -164,8 +178,13 @@ async def calculator_handler(args):
         )
 
         result_message = None
+        received_messages: list[Any] = []
+        message_snapshots: list[dict[str, Any]] = []
         async with claude_agent_sdk.ClaudeSDKClient(options=options, transport=transport) as client:
-            await client.query("What is 15 multiplied by 7? Then subtract 5 from the result.")
+            await client.query(
+                "What is 15 multiplied by 7? Then subtract 5 from the result. "
+                "You must use the calculator MCP tool for both operations in order; do not calculate directly."
+            )
 
             # Deterministically let local MCP dispatch race ahead of application
             # consumption of the AssistantMessage containing its tool_use block.
@@ -174,9 +193,15 @@ async def calculator_handler(args):
             await asyncio.wait_for(handler_started.wait(), timeout=1)
 
             async for message in client.receive_response():
+                received_messages.append(message)
+                message_snapshots.append(copy.deepcopy(vars(message)))
                 if type(message).__name__ == "ResultMessage":
                     result_message = message
 
+        assert options.include_partial_messages is True
+        assert options.hooks is None
+        assert [vars(message) for message in received_messages] == message_snapshots
+
     spans = memory_logger.pop()
 
     task_spans = [s for s in spans if s["span_attributes"]["type"] == SpanTypeAttribute.TASK]
@@ -208,8 +233,39 @@ async def calculator_handler(args):
     llm_span_ids = {span["span_id"] for span in llm_spans}
     _assert_llm_spans_have_time_to_first_token(llm_spans)
 
-    llm_spans_with_metrics = [s for s in llm_spans if "prompt_tokens" in s.get("metrics", {})]
-    assert len(llm_spans_with_metrics) >= 1, "At least one LLM span should have token metrics"
+    expected_partial_usage = _final_partial_usage(received_messages)
+    if expected_partial_usage:
+        ordered_llm_spans = sorted(llm_spans, key=lambda span: span["metrics"]["start"])
+        assert len(ordered_llm_spans) == len(expected_partial_usage)
+        for llm_span, usage in zip(ordered_llm_spans, expected_partial_usage, strict=True):
+            assert llm_span["metrics"] | _metrics_from_exact_anthropic_usage(usage) == llm_span["metrics"]
+    elif _sdk_version_at_least("0.1.11"):
+        expected_usage_by_message_id: dict[str, dict[str, Any]] = {}
+        for message in received_messages:
+            message_id = getattr(message, "message_id", None)
+            usage = _copy_numeric_usage(getattr(message, "usage", None))
+            if isinstance(message_id, str) and usage:
+                expected_usage_by_message_id[message_id] = usage
+
+        expected_usage = list(expected_usage_by_message_id.values())
+        assert expected_usage, "Cassette must contain per-request assistant usage"
+        ordered_llm_spans = sorted(llm_spans, key=lambda span: span["metrics"]["start"])
+        assert len(ordered_llm_spans) == len(expected_usage)
+        for llm_span, usage in zip(ordered_llm_spans, expected_usage, strict=True):
+            expected_metrics = _metrics_from_exact_anthropic_usage(usage)
+            for unreliable_metric in ("completion_tokens", "tokens"):
+                expected_metrics.pop(unreliable_metric, None)
+            assert llm_span["metrics"] | expected_metrics == llm_span["metrics"]
+            assert "completion_tokens" not in llm_span["metrics"]
+            assert "tokens" not in llm_span["metrics"]
+            if "cache_creation" in usage:
+                assert "prompt_cache_creation_tokens" not in llm_span["metrics"]
+
+    assert not {
+        "prompt_tokens",
+        "completion_tokens",
+        "tokens",
+    }.intersection(task_span.get("metrics", {}))
 
     for llm_span in llm_spans:
         assert llm_span["span_attributes"]["name"] == "anthropic.messages.create"
@@ -220,7 +276,8 @@ async def calculator_handler(args):
         for metric_name in ("prompt_tokens", "completion_tokens", "tokens"):
             if metric_name in llm_span.get("metrics", {}):
                 assert llm_span["metrics"][metric_name] > 0
-    assert any(llm_span.get("metadata", {}).get("usage_service_tier") == "standard" for llm_span in llm_spans)
+    if _sdk_version_at_least("0.1.11"):
+        assert any(llm_span.get("metadata", {}).get("usage_service_tier") == "standard" for llm_span in llm_spans)
     if any("usage_inference_geo" in llm_span.get("metadata", {}) for llm_span in llm_spans):
         assert all(
             isinstance(llm_span.get("metadata", {}).get("usage_inference_geo"), str)
@@ -228,9 +285,10 @@ async def calculator_handler(args):
             if "usage_inference_geo" in llm_span.get("metadata", {})
         )
     tool_spans = [s for s in spans if s["span_attributes"]["type"] == SpanTypeAttribute.TOOL]
-    assert len(tool_spans) == 2, "Each local MCP call should create exactly one canonical tool span"
-    for tool_span in tool_spans:
-        assert tool_span["span_attributes"]["name"] == "calculator"
+    calculator_spans = [span for span in tool_spans if span["span_attributes"]["name"] == "calculator"]
+    assert len(calculator_spans) == 2, f"Expected both calculator operations, got {len(calculator_spans)}"
+    assert len(llm_spans) >= 2, f"Expected multiple provider requests, got {len(llm_spans)}"
+    for tool_span in calculator_spans:
         assert tool_span["input"] is not None
         assert tool_span["output"] is not None
         assert tool_span.get("metadata", {}).get("gen_ai.tool.call.id")
@@ -299,7 +357,10 @@ async def calculator_handler(args):
             ) as calculator_client,
             claude_agent_sdk.ClaudeSDKClient(options=other_options, transport=other_transport) as other_client,
         ):
-            await calculator_client.query("What is 15 multiplied by 7? Then subtract 5 from the result.")
+            await calculator_client.query(
+                "What is 15 multiplied by 7? Then subtract 5 from the result. "
+                "You must use the calculator MCP tool for both operations in order; do not calculate directly."
+            )
             await asyncio.wait_for(calculator_transport.wait_for_mcp_tool_call(), timeout=1)
 
             await other_client.query("Say hi")
@@ -327,6 +388,98 @@ async def calculator_handler(args):
     assert multiply_span["span_id"] in nested_span["span_parents"]
 
 
+@pytest.mark.skipif(not CLAUDE_SDK_AVAILABLE, reason="Claude Agent SDK not installed")
+@pytest.mark.asyncio
+async def test_query_helper_keeps_options_untouched_and_logs_aggregate_task_usage(memory_logger):
+    if not _sdk_version_at_least("0.1.11"):
+        pytest.skip("The 0.1.10 query() transport lifecycle is incompatible with the client cassette")
+    assert not memory_logger.pop()
+    prompt = "Say hello in one short sentence."
+
+    hooks = {"UserPromptSubmit": [claude_agent_sdk.HookMatcher(hooks=[_concise_user_prompt_hook])]}
+    options = claude_agent_sdk.ClaudeAgentOptions(
+        model=TEST_MODEL,
+        permission_mode="bypassPermissions",
+        hooks=hooks,
+    )
+    transport = make_cassette_transport(
+        cassette_name="test_user_prompt_submit_hook_creates_function_span",
+        prompt="",
+        options=options,
+    )
+    wrapped_query = _create_query_wrapper_function(claude_agent_sdk.query)
+    received_messages = [
+        message
+        async for message in wrapped_query(
+            prompt=prompt,
+            options=options,
+            transport=transport,
+        )
+    ]
+
+    assert options.hooks is hooks
+    assert received_messages
+    assert type(received_messages[-1]).__name__ == "ResultMessage"
+
+    spans = memory_logger.pop()
+    task_span = find_span_by_name(find_spans_by_type(spans, SpanTypeAttribute.TASK), "Claude Agent")
+    llm_spans = find_spans_by_type(spans, SpanTypeAttribute.LLM)
+    assert len(llm_spans) == 1
+    assert not {
+        "prompt_tokens",
+        "completion_tokens",
+        "tokens",
+        "prompt_cached_tokens",
+        "prompt_cache_creation_tokens",
+        "prompt_cache_creation_5m_tokens",
+        "prompt_cache_creation_1h_tokens",
+    }.intersection(llm_spans[0].get("metrics", {}))
+
+    result_message = received_messages[-1]
+    expected_metrics = _metrics_from_result_message(result_message)
+    assert task_span["metrics"] | expected_metrics == task_span["metrics"]
+    _, expected_usage_metadata = extract_anthropic_usage(result_message.usage)
+    assert task_span["metadata"] | expected_usage_metadata == task_span["metadata"]
+
+
+@pytest.mark.skipif(not CLAUDE_SDK_AVAILABLE, reason="Claude Agent SDK not installed")
+@pytest.mark.asyncio
+async def test_connect_with_prompt_logs_aggregate_task_usage(memory_logger):
+    if not _sdk_version_at_least("0.1.11"):
+        pytest.skip("Transcript usage is not exposed by the older SDK cassette")
+    assert not memory_logger.pop()
+    prompt = "Say hello in one short sentence."
+
+    options = claude_agent_sdk.ClaudeAgentOptions(
+        model=TEST_MODEL,
+        permission_mode="bypassPermissions",
+        hooks={"UserPromptSubmit": [claude_agent_sdk.HookMatcher(hooks=[_concise_user_prompt_hook])]},
+    )
+    transport = make_cassette_transport(
+        cassette_name="test_user_prompt_submit_hook_creates_function_span",
+        prompt="",
+        options=options,
+    )
+
+    with _patched_claude_sdk(wrap_client=True):
+        client = claude_agent_sdk.ClaudeSDKClient(options=options, transport=transport)
+        try:
+            await client.connect(prompt)
+            await asyncio.sleep(0.05)
+            received_messages = [message async for message in client.receive_response()]
+        finally:
+            await client.disconnect()
+
+    spans = memory_logger.pop()
+    task_span = find_span_by_name(find_spans_by_type(spans, SpanTypeAttribute.TASK), "Claude Agent")
+    llm_spans = find_spans_by_type(spans, SpanTypeAttribute.LLM)
+    assert len(llm_spans) == 1
+    assert not {"prompt_tokens", "completion_tokens", "tokens"}.intersection(llm_spans[0].get("metrics", {}))
+    result_message = received_messages[-1]
+    expected_metrics = _metrics_from_result_message(result_message)
+    assert task_span["metrics"] | expected_metrics == task_span["metrics"]
+
+
 def _make_message(content: str) -> dict:
     """Create a streaming format message dict."""
     return {"type": "user", "message": {"role": "user", "content": content}}
@@ -346,6 +499,99 @@ def _assert_llm_spans_have_time_to_first_token(llm_spans: list[dict[str, Any]])
         assert llm_span["metrics"]["time_to_first_token"] >= 0
 
 
+def _copy_numeric_usage(usage: Any) -> dict[str, Any]:
+    if not isinstance(usage, dict):
+        return {}
+
+    copied = {
+        key: value
+        for key in (
+            "input_tokens",
+            "output_tokens",
+            "cache_read_input_tokens",
+            "cache_creation_input_tokens",
+        )
+        if isinstance((value := usage.get(key)), int) and not isinstance(value, bool) and value >= 0
+    }
+    cache_creation = usage.get("cache_creation")
+    if isinstance(cache_creation, dict):
+        copied_cache_creation = {
+            key: value
+            for key in ("ephemeral_5m_input_tokens", "ephemeral_1h_input_tokens")
+            if isinstance((value := cache_creation.get(key)), int) and not isinstance(value, bool) and value >= 0
+        }
+        if copied_cache_creation:
+            copied["cache_creation"] = copied_cache_creation
+    return copied
+
+
+def _metrics_from_result_message(message: Any) -> dict[str, float]:
+    usage = _aggregate_model_usage(getattr(message, "model_usage", None)) or _copy_numeric_usage(message.usage)
+    metrics, _ = extract_anthropic_usage(usage)
+    return metrics
+
+
+def _metrics_from_exact_anthropic_usage(usage: dict[str, Any]) -> dict[str, float]:
+    input_tokens = usage.get("input_tokens", 0)
+    output_tokens = usage.get("output_tokens")
+    cache_read_tokens = usage.get("cache_read_input_tokens", 0)
+    aggregate_cache_creation = usage.get("cache_creation_input_tokens", 0)
+    cache_creation = usage.get("cache_creation") or {}
+    cache_creation_5m = cache_creation.get("ephemeral_5m_input_tokens")
+    cache_creation_1h = cache_creation.get("ephemeral_1h_input_tokens")
+    has_cache_creation_breakdown = cache_creation_5m is not None or cache_creation_1h is not None
+    effective_cache_creation = (
+        (cache_creation_5m or 0) + (cache_creation_1h or 0)
+        if has_cache_creation_breakdown
+        else aggregate_cache_creation
+    )
+    prompt_tokens = input_tokens + cache_read_tokens + effective_cache_creation
+    metrics: dict[str, float] = {
+        "prompt_tokens": float(prompt_tokens),
+        "prompt_cached_tokens": float(cache_read_tokens),
+    }
+    if has_cache_creation_breakdown:
+        if cache_creation_5m is not None:
+            metrics["prompt_cache_creation_5m_tokens"] = float(cache_creation_5m)
+        if cache_creation_1h is not None:
+            metrics["prompt_cache_creation_1h_tokens"] = float(cache_creation_1h)
+    else:
+        metrics["prompt_cache_creation_tokens"] = float(aggregate_cache_creation)
+    if output_tokens is not None:
+        metrics["completion_tokens"] = float(output_tokens)
+        metrics["tokens"] = float(prompt_tokens + output_tokens)
+    return metrics
+
+
+def _final_partial_usage(messages: list[Any]) -> list[dict[str, Any]]:
+    active_message_by_parent: dict[str | None, str] = {}
+    usage_by_message_id: dict[str, dict[str, Any]] = {}
+    message_order: list[str] = []
+
+    for message in messages:
+        if type(message).__name__ != "StreamEvent":
+            continue
+        event = getattr(message, "event", None)
+        if not isinstance(event, dict):
+            continue
+        parent_tool_use_id = getattr(message, "parent_tool_use_id", None)
+        if event.get("type") == "message_start":
+            raw_message = event.get("message")
+            message_id = raw_message.get("id") if isinstance(raw_message, dict) else None
+            if isinstance(message_id, str):
+                active_message_by_parent[parent_tool_use_id] = message_id
+                usage_by_message_id[message_id] = _copy_numeric_usage(raw_message.get("usage"))
+                message_order.append(message_id)
+        elif event.get("type") == "message_delta":
+            message_id = active_message_by_parent.get(parent_tool_use_id)
+            if message_id is not None:
+                usage_by_message_id[message_id].update(_copy_numeric_usage(event.get("usage")))
+        elif event.get("type") == "message_stop":
+            active_message_by_parent.pop(parent_tool_use_id, None)
+
+    return [usage_by_message_id[message_id] for message_id in message_order]
+
+
 def _sdk_cassette_name(base: str, *, min_version: str) -> str:
     """Return base cassette name for SDK >= min_version, else a version-specific variant."""
     if _sdk_version_at_least(min_version):
@@ -515,6 +761,7 @@ async def user_prompt_hook(input_data: Any, tool_use_id: str | None, context: An
                 "hook_event_name": input_data.get("hook_event_name"),
                 "prompt": input_data.get("prompt"),
                 "tool_use_id": tool_use_id,
+                "transcript_path": input_data.get("transcript_path"),
             }
         )
         return {
@@ -540,13 +787,15 @@ async def user_prompt_hook(input_data: Any, tool_use_id: str | None, context: An
             options=options,
         )
 
+        received_messages: list[Any] = []
         async with claude_agent_sdk.ClaudeSDKClient(options=options, transport=transport) as client:
             await client.query(prompt)
             async for message in client.receive_response():
+                received_messages.append(message)
                 if type(message).__name__ == "ResultMessage":
                     break
 
-    assert hook_invocations, "Expected the UserPromptSubmit hook to be invoked"
+    assert len(hook_invocations) == 1, "Expected the caller's UserPromptSubmit hook exactly once"
 
     spans = memory_logger.pop()
     task_span = find_span_by_name(find_spans_by_type(spans, SpanTypeAttribute.TASK), "Claude Agent")
@@ -567,6 +816,11 @@ async def user_prompt_hook(input_data: Any, tool_use_id: str | None, context: An
     assert hook_span["input"]["prompt"] == prompt
     assert hook_span["output"]["hookSpecificOutput"]["hookEventName"] == "UserPromptSubmit"
     assert llm_spans, "Expected at least one LLM span for the Claude response"
+    for llm_span in llm_spans:
+        assert not {"prompt_tokens", "completion_tokens", "tokens"}.intersection(llm_span.get("metrics", {}))
+    result_message = received_messages[-1]
+    expected_metrics = _metrics_from_result_message(result_message)
+    assert task_span["metrics"] | expected_metrics == task_span["metrics"]
     assert any(
         isinstance(llm_span.get("input"), list)
         and llm_span["input"]
@@ -858,6 +1112,7 @@ async def test_multiple_bundled_subagents_keep_outer_orchestration_separate(memo
             options=options,
         )
 
+        received_messages: list[Any] = []
         async with claude_agent_sdk.ClaudeSDKClient(options=options, transport=transport) as client:
             await client.query(
                 "Launch two bundled general-purpose subagents for two independent tasks. "
@@ -866,10 +1121,13 @@ async def test_multiple_bundled_subagents_keep_outer_orchestration_separate(memo
                 "'alpha:<version> | <owner>'. "
                 "The second delegated subagent must use Bash and Read on release_notes_beta.md and return only "
                 "'beta:<version> | <owner>'. "
+                "If either agent runs in the background, use TaskOutput with block=true to wait for each result. "
+                "Do not finish while either task is still running. "
                 "After both delegated agents finish, reply with exactly two lines in that same order. "
                 "Do not answer directly without using both subagents."
             )
             async for message in client.receive_response():
+                received_messages.append(message)
                 if type(message).__name__ == "ResultMessage":
                     break
 
@@ -882,6 +1140,12 @@ async def test_multiple_bundled_subagents_keep_outer_orchestration_separate(memo
     subagent_spans = [s for s in task_spans if s["span_attributes"]["name"] != "Claude Agent"]
     assert len(subagent_spans) >= 2, f"Expected at least two delegated task spans, got {len(subagent_spans)}"
 
+    for llm_span in llm_spans:
+        assert not {"prompt_tokens", "completion_tokens", "tokens"}.intersection(llm_span.get("metrics", {}))
+    result_message = received_messages[-1]
+    expected_metrics = _metrics_from_result_message(result_message)
+    assert root_task_span["metrics"] | expected_metrics == root_task_span["metrics"]
+
     outer_llm_spans = [llm_span for llm_span in llm_spans if root_task_span["span_id"] in llm_span["span_parents"]]
     assert outer_llm_spans, "Expected outer orchestration LLM spans under the root task"
 
@@ -2021,6 +2285,32 @@ def test_extract_anthropic_usage_normalizes_claude_result_message_usage():
     assert metadata == {}
 
 
+def test_aggregate_model_usage_includes_all_agents_and_ignores_invalid_fields():
+    usage = _aggregate_model_usage(
+        {
+            "claude-opus": {
+                "inputTokens": 5,
+                "outputTokens": 3,
+                "cacheReadInputTokens": 11,
+                "cacheCreationInputTokens": 2,
+            },
+            "claude-haiku": types.SimpleNamespace(
+                inputTokens=7,
+                outputTokens=4,
+                cacheReadInputTokens=None,
+                cacheCreationInputTokens=-1,
+            ),
+        }
+    )
+
+    assert usage == {
+        "input_tokens": 12,
+        "output_tokens": 7,
+        "cache_read_input_tokens": 11,
+        "cache_creation_input_tokens": 2,
+    }
+
+
 @pytest.mark.parametrize(
     "prompt,conversation_history,expected",
     [
diff --git a/py/src/braintrust/integrations/claude_agent_sdk/tracing.py b/py/src/braintrust/integrations/claude_agent_sdk/tracing.py
index 059c8e540..086088643 100644
--- a/py/src/braintrust/integrations/claude_agent_sdk/tracing.py
+++ b/py/src/braintrust/integrations/claude_agent_sdk/tracing.py
@@ -3,6 +3,7 @@
 import contextvars
 import dataclasses
 import json
+import math
 import threading
 import time
 from collections.abc import AsyncGenerator, AsyncIterable
@@ -575,6 +576,91 @@ def _message_starts_subagent_tool(message: Any) -> bool:
     return False
 
 
+def _token_count(value: Any) -> int | None:
+    if isinstance(value, bool) or not isinstance(value, (int, float)):
+        return None
+    if not math.isfinite(value) or value < 0 or int(value) != value:
+        return None
+    return int(value)
+
+
+def _copy_usage(usage: Any) -> dict[str, Any] | None:
+    if usage is None:
+        return None
+    if not isinstance(usage, dict):
+        try:
+            usage = vars(usage)
+        except TypeError:
+            return None
+
+    copied: dict[str, Any] = {}
+    for key in (
+        "input_tokens",
+        "output_tokens",
+        "cache_read_input_tokens",
+        "cache_creation_input_tokens",
+    ):
+        value = _token_count(usage.get(key))
+        if value is not None:
+            copied[key] = value
+
+    cache_creation = usage.get("cache_creation")
+    if cache_creation is not None and not isinstance(cache_creation, dict):
+        try:
+            cache_creation = vars(cache_creation)
+        except TypeError:
+            cache_creation = None
+    if isinstance(cache_creation, dict):
+        copied_cache_creation = {}
+        for key in ("ephemeral_5m_input_tokens", "ephemeral_1h_input_tokens"):
+            value = _token_count(cache_creation.get(key))
+            if value is not None:
+                copied_cache_creation[key] = value
+        if copied_cache_creation:
+            copied["cache_creation"] = copied_cache_creation
+
+    return copied or None
+
+
+def _merge_usage(base: dict[str, Any] | None, override: dict[str, Any] | None) -> dict[str, Any] | None:
+    if base is None or override is None:
+        return override or base
+    merged = {**base, **override}
+    base_cache = base.get("cache_creation")
+    override_cache = override.get("cache_creation")
+    if isinstance(base_cache, dict) or isinstance(override_cache, dict):
+        merged["cache_creation"] = {
+            **(base_cache if isinstance(base_cache, dict) else {}),
+            **(override_cache if isinstance(override_cache, dict) else {}),
+        }
+    return merged
+
+
+def _aggregate_model_usage(model_usage: Any) -> dict[str, int] | None:
+    """Aggregate the SDK's all-agent model usage into Anthropic usage fields."""
+    if not isinstance(model_usage, dict):
+        return None
+
+    field_names = {
+        "inputTokens": "input_tokens",
+        "outputTokens": "output_tokens",
+        "cacheReadInputTokens": "cache_read_input_tokens",
+        "cacheCreationInputTokens": "cache_creation_input_tokens",
+    }
+    totals: dict[str, int] = {}
+    for raw_usage in model_usage.values():
+        if not isinstance(raw_usage, dict):
+            try:
+                raw_usage = vars(raw_usage)
+            except TypeError:
+                continue
+        for source_name, target_name in field_names.items():
+            value = _token_count(raw_usage.get(source_name))
+            if value is not None:
+                totals[target_name] = totals.get(target_name, 0) + value
+    return totals or None
+
+
 @dataclasses.dataclass
 class _AgentContext:
     """Per-subagent-context state, keyed by parent_tool_use_id (None = orchestrator)."""
@@ -582,6 +668,7 @@ class _AgentContext:
     llm_span: Any | None = None
     llm_parent_export: str | None = None
     llm_output: list[dict[str, Any]] | None = None
+    llm_message_id: str | None = None
     next_llm_start: float | None = None
     task_span: Any | None = None
     task_confirmed: bool = False
@@ -596,6 +683,7 @@ def __init__(
         prompt: Any,
         query_start_time: float | None = None,
         captured_messages: list[dict[str, Any]] | None = None,
+        include_partial_messages: bool = False,
     ) -> None:
         self._root_span = root_span
         self._root_span_export = root_span.export()
@@ -610,6 +698,11 @@ def __init__(
         self._final_results: list[dict[str, Any]] = []
         self._result_output: Any | None = None
         self._task_events: list[dict[str, Any]] = []
+        self._include_partial_messages = include_partial_messages
+        self._active_partial_message_id_by_parent: dict[str | None, str] = {}
+        self._latest_partial_message_id_by_parent: dict[str | None, str] = {}
+        self._usage_by_message_id: dict[str, dict[str, Any]] = {}
+        self._final_output_usage_message_ids: set[str] = set()
 
         _thread_local.tool_span_tracker = self._tool_tracker
 
@@ -617,9 +710,8 @@ def __init__(
 
     def add(self, message: Any) -> None:
         """Consume one SDK message and update spans accordingly."""
-        if self._captured_messages is not None:
-            if self._captured_messages:
-                self._root_span.log(input=self._captured_messages)
+        if self._captured_messages:
+            self._root_span.log(input=self._captured_messages)
             self._captured_messages = None
 
         message_type = type(message).__name__
@@ -629,6 +721,8 @@ def add(self, message: Any) -> None:
             self._handle_user(message)
         elif message_type == MessageClassName.RESULT:
             self._handle_result(message)
+        elif message_type == "StreamEvent":
+            self._handle_stream_event(message)
         elif message_type in SYSTEM_MESSAGE_TYPES:
             self._handle_system(message)
 
@@ -657,6 +751,10 @@ def cleanup(self) -> None:
                 ctx.task_span = None
         self._task_order.clear()
         self._tool_tracker.cleanup_all()
+        self._active_partial_message_id_by_parent.clear()
+        self._latest_partial_message_id_by_parent.clear()
+        self._usage_by_message_id.clear()
+        self._final_output_usage_message_ids.clear()
         if getattr(_thread_local, "tool_span_tracker", None) is self._tool_tracker:
             delattr(_thread_local, "tool_span_tracker")
 
@@ -747,14 +845,45 @@ def _handle_user(self, message: Any) -> None:
             resolved_key = user_parent if user_parent is not None else self._active_key
             self._get_context(resolved_key).next_llm_start = time.time()
 
+    def _handle_stream_event(self, message: Any) -> None:
+        event = getattr(message, "event", None)
+        if not isinstance(event, dict):
+            return
+        parent_tool_use_id = getattr(message, "parent_tool_use_id", None)
+        event_type = event.get("type")
+        if event_type == "message_start":
+            raw_message = event.get("message")
+            if not isinstance(raw_message, dict):
+                return
+            message_id = raw_message.get("id")
+            if not isinstance(message_id, str):
+                return
+            self._active_partial_message_id_by_parent[parent_tool_use_id] = message_id
+            self._latest_partial_message_id_by_parent[parent_tool_use_id] = message_id
+            usage = _copy_usage(raw_message.get("usage"))
+            if usage:
+                self._usage_by_message_id[message_id] = usage
+            return
+
+        message_id = self._active_partial_message_id_by_parent.get(parent_tool_use_id)
+        if message_id is None:
+            return
+        if event_type == "message_delta":
+            update = _copy_usage(event.get("usage"))
+            if update:
+                usage = _merge_usage(self._usage_by_message_id.get(message_id), update) or {}
+                self._usage_by_message_id[message_id] = usage
+                if "output_tokens" in update:
+                    self._final_output_usage_message_ids.add(message_id)
+                    ctx = self._contexts.get(parent_tool_use_id)
+                    if ctx is not None and ctx.llm_span is not None and ctx.llm_message_id == message_id:
+                        metrics, _ = extract_anthropic_usage(usage)
+                        ctx.llm_span.log(metrics=metrics or None)
+        elif event_type == "message_stop":
+            self._active_partial_message_id_by_parent.pop(parent_tool_use_id, None)
+
     def _handle_result(self, message: Any) -> None:
         self._active_key = None
-        if hasattr(message, "usage"):
-            usage_metrics, usage_metadata = extract_anthropic_usage(message.usage)
-            ctx = self._get_context(None)
-            if ctx.llm_span and (usage_metrics or usage_metadata):
-                ctx.llm_span.log(metrics=usage_metrics or None, metadata=usage_metadata or None)
-
         result_value = getattr(message, "result", None)
         if result_value is not None:
             self._result_output = result_value
@@ -771,8 +900,16 @@ def _handle_result(self, message: Any) -> None:
             }.items()
             if v is not None
         }
-        if result_metadata:
-            self._root_span.log(metadata=result_metadata)
+        result_metrics: dict[str, float] = {}
+        if not self._include_partial_messages:
+            raw_usage = getattr(message, "usage", None)
+            _, usage_metadata = extract_anthropic_usage(raw_usage)
+            result_metadata.update(usage_metadata)
+            aggregate_usage = _aggregate_model_usage(getattr(message, "model_usage", None))
+            usage = aggregate_usage or _copy_usage(raw_usage)
+            result_metrics, _ = extract_anthropic_usage(usage)
+        if result_metadata or result_metrics:
+            self._root_span.log(metadata=result_metadata or None, metrics=result_metrics or None)
 
         if getattr(message, "is_error", None) is True:
             error_text = (
@@ -838,13 +975,22 @@ def _start_or_merge_llm_span(
         parent_export: str | None,
         ctx: _AgentContext,
     ) -> tuple[dict[str, Any] | None, bool]:
-        """Start a new LLM span or extend the existing one via merge."""
+        """Start one LLM span per provider message ID and merge its snapshots."""
         current_message = _serialize_assistant_message(message)
+        message_id = getattr(message, "message_id", None)
+        if not isinstance(message_id, str):
+            message_id = self._latest_partial_message_id_by_parent.get(getattr(message, "parent_tool_use_id", None))
+        same_provider_message = (
+            isinstance(message_id, str)
+            and message_id == ctx.llm_message_id
+            or message_id is None
+            and ctx.llm_message_id is None
+            and ctx.next_llm_start is None
+        )
 
-        # Merge path.
         if (
             ctx.llm_span
-            and ctx.next_llm_start is None
+            and same_provider_message
             and ctx.llm_parent_export == parent_export
             and current_message is not None
         ):
@@ -855,9 +1001,9 @@ def _start_or_merge_llm_span(
             if merged is not None:
                 ctx.llm_output = [merged]
                 ctx.llm_span.log(output=ctx.llm_output)
+            self._log_assistant_usage(message, ctx, message_id)
             return merged, True
 
-        # New span path.
         resolved_start = ctx.next_llm_start or time.time()
         first_token_time = time.time()
 
@@ -876,9 +1022,31 @@ def _start_or_merge_llm_span(
         ctx.llm_span = span
         ctx.llm_parent_export = parent_export
         ctx.llm_output = [final_content] if final_content is not None else None
+        ctx.llm_message_id = message_id if isinstance(message_id, str) else None
         ctx.next_llm_start = None
+        self._log_assistant_usage(message, ctx, ctx.llm_message_id)
         return final_content, False
 
+    def _log_assistant_usage(
+        self,
+        message: Any,
+        ctx: _AgentContext,
+        message_id: str | None,
+    ) -> None:
+        if ctx.llm_span is None or not self._include_partial_messages:
+            return
+        raw_message_usage = getattr(message, "usage", None)
+        usage = _merge_usage(
+            _copy_usage(raw_message_usage),
+            self._usage_by_message_id.get(message_id) if message_id else None,
+        )
+        if not usage:
+            return
+        has_final_output = message_id in self._final_output_usage_message_ids if message_id else False
+        metrics, _ = extract_anthropic_usage(usage, include_output=has_final_output)
+        _, metadata = extract_anthropic_usage(raw_message_usage, include_output=False)
+        ctx.llm_span.log(metrics=metrics or None, metadata=metadata or None)
+
     def _process_task_event(self, message: Any, agent_span_export: str | None) -> None:
         """Handle TaskStarted / TaskProgress / TaskNotification system messages."""
         task_id = _msg_field(message, "task_id")
@@ -925,6 +1093,7 @@ def __init__(
         prompt: Any,
         query_start_time: float | None = None,
         captured_messages: list[dict[str, Any]] | None = None,
+        include_partial_messages: bool = False,
     ) -> None:
         self._root_span = start_span(
             name=CLAUDE_AGENT_TASK_SPAN_NAME,
@@ -937,6 +1106,7 @@ def __init__(
             prompt=prompt,
             query_start_time=query_start_time,
             captured_messages=captured_messages,
+            include_partial_messages=include_partial_messages,
         )
         self._pretraced_message_types: collections.deque[str] = collections.deque()
         self._finished = False
@@ -1100,6 +1270,10 @@ async def capturing_wrapper() -> AsyncGenerator[dict[str, Any], None]:
     return prompt, str(prompt), None
 
 
+def _include_partial_messages(options: Any) -> bool:
+    return getattr(options, "include_partial_messages", False) is True
+
+
 async def _stream_messages_with_tracing(
     generator: AsyncIterable[Any],
     *,
@@ -1138,10 +1312,15 @@ async def wrapped_query(*args: Any, **kwargs: Any) -> AsyncGenerator[Any, None]:
             kwargs = dict(kwargs)
             kwargs["prompt"] = prompt
 
+        options = kwargs.get("options")
+        if options is None and len(args) > 1:
+            options = args[1]
+
         request_tracker = RequestTracker(
             prompt=traced_prompt,
             query_start_time=query_start_time,
             captured_messages=captured_messages,
+            include_partial_messages=_include_partial_messages(options),
         )
         generator = _bind_request_tracker_to_query(original_query(*args, **kwargs), request_tracker)
 
@@ -1160,7 +1339,8 @@ def _create_client_wrapper_class(original_client_class: Any) -> Any:
 
     class WrappedClaudeSDKClient(Wrapper):
         def __init__(self, *args: Any, **kwargs: Any):
-            # Create the original client instance
+            options = args[0] if args else kwargs.get("options")
+            self.__include_partial_messages = _include_partial_messages(options)
             client = original_client_class(*args, **kwargs)
             super().__init__(client)
             self.__client = client
@@ -1201,6 +1381,18 @@ async def wrapped_callback(
                 hook_callbacks[callback_id] = wrapped_callback
                 self.__instrumented_hook_callbacks.add(marker)
 
+        def __prepare_request_prompt(
+            self, args: tuple[Any, ...], kwargs: dict[str, Any]
+        ) -> tuple[tuple[Any, ...], dict[str, Any]]:
+            self.__query_start_time = time.time()
+            prompt = args[0] if args else kwargs.get("prompt")
+            prompt, self.__last_prompt, self.__captured_messages = _prepare_prompt_for_tracing(prompt)
+            if args:
+                return (prompt, *args[1:]), kwargs
+            prepared_kwargs = dict(kwargs)
+            prepared_kwargs["prompt"] = prompt
+            return args, prepared_kwargs
+
         def __start_request_tracker(self) -> RequestTracker:
             if self.__request_tracker is not None:
                 self.__finish_request_tracker()
@@ -1209,6 +1401,7 @@ def __start_request_tracker(self) -> RequestTracker:
                 prompt=self.__last_prompt,
                 query_start_time=self.__query_start_time,
                 captured_messages=self.__captured_messages,
+                include_partial_messages=self.__include_partial_messages,
             )
             query = getattr(self.__client, "_query", None)
             _install_query_message_tracing(query)
@@ -1228,25 +1421,28 @@ def __finish_request_tracker(self, *, log_output: bool = False) -> None:
             self.__request_tracker = None
 
         async def connect(self, *args: Any, **kwargs: Any) -> Any:
-            result = await self.__client.connect(*args, **kwargs)
-            _install_query_message_tracing(getattr(self.__client, "_query", None))
+            prompt = args[0] if args else kwargs.get("prompt")
+            if prompt is not None:
+                args, kwargs = self.__prepare_request_prompt(args, kwargs)
+                self.__start_request_tracker()
+            try:
+                result = await self.__client.connect(*args, **kwargs)
+            except Exception as exc:
+                if self.__request_tracker is not None:
+                    self.__request_tracker.log_error(exc)
+                self.__finish_request_tracker()
+                raise
+
+            query = getattr(self.__client, "_query", None)
+            _install_query_message_tracing(query)
+            if query is not None and self.__request_tracker is not None:
+                query._braintrust_request_tracker = self.__request_tracker
             self.__instrument_hook_callbacks()
             return result
 
         async def query(self, *args: Any, **kwargs: Any) -> Any:
             """Wrap query to capture the prompt and start time for tracing."""
-            # Capture the time when query is called (when LLM call starts)
-            self.__query_start_time = time.time()
-
-            # Capture the prompt for use in receive_response
-            prompt = args[0] if args else kwargs.get("prompt")
-            prompt, self.__last_prompt, self.__captured_messages = _prepare_prompt_for_tracing(prompt)
-
-            if args:
-                args = (prompt,) + args[1:]
-            else:
-                kwargs["prompt"] = prompt
-
+            args, kwargs = self.__prepare_request_prompt(args, kwargs)
             self.__instrument_hook_callbacks()
             self.__start_request_tracker()