diff --git a/.agents/roles.md b/.agents/roles.md
index bc53228..ed27857 100644
--- a/.agents/roles.md
+++ b/.agents/roles.md
@@ -21,7 +21,7 @@ Treat role assignment, approved Spec handoff, final review, and verification evi
 | Tier | Use | Model |
 | --- | --- | --- |
 | `Primary` | Planning, implementation, public API decisions, final integration, and failed-check triage | Active primary agent |
-| `SDD Gate` | Design analysis and final diff review | `gpt-6-astra`, `xhigh` |
+| `SDD Gate` | Design analysis and final diff review | `gpt-6-astra`, `medium` |
 | `Lightweight` | Read-only review, checklist verification, CI log summaries, documentation drafts, and architecture preflight | `gpt-5.3-codex-spark`; use `gpt-5.6-luna`, `high` only when unavailable |
 
 | Role | Owner or custom agent | Tier |
@@ -37,7 +37,7 @@ Treat role assignment, approved Spec handoff, final review, and verification evi
 
 ## Dispatch and Fallback Rules
 
-- `Designer` and `Code Reviewer` use only `gpt-6-astra`, `xhigh`, with no Luna fallback.
+- `Designer` and `Code Reviewer` use only `gpt-6-astra`, `medium`, with no Luna fallback.
 - Lightweight roles use Spark first and may use only the matching `*_luna` setting when Spark is unavailable.
 - A `*_luna` role must not replace `Designer`, `Code Reviewer`, `Planner`, or `Implementer`.
 - A side task `task_name` must exactly match the `.codex/agents/<name>.toml` filename without its extension.
diff --git a/.codex/agents/code_reviewer.toml b/.codex/agents/code_reviewer.toml
index 48cbad0..9e0478e 100644
--- a/.codex/agents/code_reviewer.toml
+++ b/.codex/agents/code_reviewer.toml
@@ -1,7 +1,7 @@
 name = "code_reviewer"
 description = "Read-only Cradle code reviewer for correctness, regressions, public API, Macro, concurrency, scope drift, and missing verification."
 model = "gpt-6-astra"
-model_reasoning_effort = "xhigh"
+model_reasoning_effort = "medium"
 sandbox_mode = "read-only"
 developer_instructions = """
 Read AGENTS.md and .agents/roles.md before reviewing.
diff --git a/.codex/agents/designer.toml b/.codex/agents/designer.toml
index c6381c7..5491fa9 100644
--- a/.codex/agents/designer.toml
+++ b/.codex/agents/designer.toml
@@ -1,7 +1,7 @@
 name = "designer"
 description = "Read-only Cradle SDD gate for Design Brief analysis, public API boundaries, Spec acceptance criteria, verification, and minimum commit units."
 model = "gpt-6-astra"
-model_reasoning_effort = "xhigh"
+model_reasoning_effort = "medium"
 sandbox_mode = "read-only"
 developer_instructions = """
 Read AGENTS.md and .agents/roles.md before analysis.