diff --git a/labs/15-pitot/pitot-distribution/UPSTREAM.json b/labs/15-pitot/pitot-distribution/UPSTREAM.json
index 220e63615..9d686bc0e 100644
--- a/labs/15-pitot/pitot-distribution/UPSTREAM.json
+++ b/labs/15-pitot/pitot-distribution/UPSTREAM.json
@@ -2,7 +2,7 @@
   "files": {
     "CONTRIBUTING.md": "0613b71aa497f8ca7d7296bf34ade87bfc7237a664d2e812d9b77b3b6befb0ad",
     "README.md": "e54193fee53061889b3d5e82df7c76e72e440f265377d260b4a793475c216a7a",
-    "adapters/adapters.go": "80110df7289ea69f830b48667326ef297770c596e4ddbf1bc66201639f8288ad",
+    "adapters/adapters.go": "1b09f188ed9d3f8a1b159055556bd2a68153ad6ee9d59810b23c18a96a4a83bd",
     "assets/pitot-boundary.png": "8a0ddb7d81831d94e14813f50ea4ca8670d77417f339ed2f91f0c653bf52f41d",
     "assets/pitot-boundary.svg": "0c3871d70c84748573f231842091deb38a6def2862403ca34e8cc4493b9c9ebf",
     "assets/pitot-hero.png": "a73532252b1e66c06273abbf5a4fe6261e98de3133b09e8d550edacfeeab92f8",
@@ -13,15 +13,15 @@
     "bridge/bridge.go": "79ac2e025e16782f3c283b43cbea5b9ba4f837446583864df8f57d6346cae816",
     "bridge/bridge_test.go": "23a19b7580d4b1e826224ec8322208ccca44ddd9a97b150efe15cafecc53e47f",
     "cmd/generate-schema/main.go": "6e9d0030290d99e36967433f96e38385a122974f899ad9421aac1ef7e50d8fcb",
-    "cmd/pitot/main.go": "a8ef8a789abe13f41d8a1014de3fb4ad46522b558f0ace70786b904e81892b05",
-    "cmd/pitot/main_test.go": "ab2894327e7a5e72e9f3d83cae637e3ccb2e1ae05f14458be4fe9016149aeef7",
+    "cmd/pitot/main.go": "266cfdd1b758f2842a3cc232346e4ada4360077b1aa18c3a635697f56cab78a8",
+    "cmd/pitot/main_test.go": "7281ac0029d5e92c63c9feb1d2095aaef924aacf4e8a3db9af52872174d609ac",
     "conformance/conformance.go": "43b692114f45c8b52958e34b35aee1cee339d8321c90f92ab4f5b963e79935bb",
     "conformance/conformance_test.go": "83ab0bcc15371265a954d177e4e97d81ad3ea734bbf736a29a54628ef64b52cd",
     "conformance/fixtures/negative.jsonl": "383dd001910699886bb1074d9225c91d8a6201e9fb3267d1a1f6e1c2753b0ba6",
     "conformance/fixtures/positive.jsonl": "d3af0f2529dac9b33fa4900f5938e36fd0b17383088dd4f0de7e6eca269441d1",
-    "doc.go": "4dcd7a831a0a8ee6c3f6eeb8408c2e6898994509b11209564c0ed6b9a5218fce",
+    "doc.go": "9b51db0301aa428db731edcf8aa6b5a4fd71ae84f6a0d6cb2fc27656b04b1428",
     "e2e/e2e_coverage_test.go": "8fac62d6d1c4ced359f8bb070379a88e77ded9912d867c642cda2d4703df23a7",
-    "e2e/e2e_hook_test.go": "a1c4601964eed674693306450249cf11a50978e5d2e00df152e33dc2c45ee1a0",
+    "e2e/e2e_hook_test.go": "cb9f27f4471c81c3320ea11be039a19514f5399b5ec5a80ae3b375dad8f8e8b5",
     "examples/doc.go": "58f3f9eb7d272d7b6eecdb05f43e1613d5e3ef92d15d97c5440bd4b6990c26f9",
     "examples/local-approval/main.go": "51386af324cd7d3bb07fe3ace53503884b02714b96b83073342fde81ce3b83a5",
     "examples/token-meter/main.go": "4b1b9c1a43c3cf48b09dba6f607776caced9d2b5b562373496b31ed184582dd1",
@@ -42,7 +42,7 @@
     "sensor/sensor.go": "939e146eaa51906972f98cf4615747eb75811b0c54d467a938825750336abeae",
     "sensor/sensor_test.go": "ea9a58d45ad56d29214a40fb2cfa935e769f85334afcb1856a20fb938d486245",
     "windtunnel/doc.go": "44e0bcde632da73e1f8b98beade3a34ca8e0d0ea79cdfb91d131de290b164fc4",
-    "windtunnel/windtunnel_test.go": "1c8b6c5d56ff5c4e66403baeae0d98108255d153c1275572b8c68e333e091493"
+    "windtunnel/windtunnel_test.go": "7e70ddf99411278175d2d2eb8ed73733367c77b3d04d55b4bf00738518673200"
   },
   "schema_version": 1
 }
diff --git a/labs/15-pitot/pitot-distribution/release-notes/2026-07-21-gemini-cli-adapter.md b/labs/15-pitot/pitot-distribution/release-notes/2026-07-21-gemini-cli-adapter.md
new file mode 100644
index 000000000..374d69afa
--- /dev/null
+++ b/labs/15-pitot/pitot-distribution/release-notes/2026-07-21-gemini-cli-adapter.md
@@ -0,0 +1,3 @@
+### Add Gemini CLI as a supported host adapter
+
+Pitot now supports the `gemini` host adapter. This integration natively parses Gemini CLI's `BeforeTool` synchronous hook events, allowing the Pitot sensor to safely monitor and project Gemini's shell command behavior along with Cursor, Claude, and Codex.
diff --git a/labs/15-pitot/pitot/adapters/adapters.go b/labs/15-pitot/pitot/adapters/adapters.go
index 401faadbc..3ff0bcbeb 100644
--- a/labs/15-pitot/pitot/adapters/adapters.go
+++ b/labs/15-pitot/pitot/adapters/adapters.go
@@ -26,6 +26,7 @@ const (
 	Cursor Host = "cursor"
 	Claude Host = "claude"
 	Codex  Host = "codex"
+	Gemini Host = "gemini"
 )
 
 // AdapterVersion is the semantic version stamped onto normalized events so
@@ -122,6 +123,26 @@ var (
 				Controllable: []string{"PreToolUse"},
 			},
 		},
+		Gemini: {
+			MainEventName: "BeforeTool",
+			Parser: ParserConfig{
+				CanonicalEvent: []byte(`{"hook_event_name":"BeforeTool","tool_name":"run_shell_command","tool_input":{"command":"git status --short"}}`),
+				CommandFor: func(raw RawHookEvent) (string, bool) {
+					if raw.ToolInput == nil {
+						return "", false
+					}
+					value, present := raw.ToolInput["command"].(string)
+					return value, present && value != ""
+				},
+				ActionKinds: map[string]string{
+					"BeforeTool": "shell",
+				},
+			},
+			Partition: ControlPartition{
+				// In Gemini, the BeforeTool hook is synchronous (blocking).
+				Controllable: []string{"BeforeTool"},
+			},
+		},
 	}
 )
 
diff --git a/labs/15-pitot/pitot/cmd/pitot/main.go b/labs/15-pitot/pitot/cmd/pitot/main.go
index f41ce6aba..aa8d13555 100644
--- a/labs/15-pitot/pitot/cmd/pitot/main.go
+++ b/labs/15-pitot/pitot/cmd/pitot/main.go
@@ -53,10 +53,10 @@ func run(args []string, stdout, stderr io.Writer) error {
 // from stdin, normalizes it, and exits with 0 (allow) or 2 (block/deny).
 func runHook(args []string, stdout, stderr io.Writer) error {
 	if len(args) == 0 {
-		return fmt.Errorf("pitot: hook requires a host identifier (cursor, claude, codex)")
+		return fmt.Errorf("pitot: hook requires a host identifier (cursor, claude, codex, gemini)")
 	}
 	host := adapters.Host(args[0])
-	if host != adapters.Cursor && host != adapters.Claude && host != adapters.Codex {
+	if host != adapters.Cursor && host != adapters.Claude && host != adapters.Codex && host != adapters.Gemini {
 		return fmt.Errorf("pitot: unsupported hook host %q", host)
 	}
 
diff --git a/labs/15-pitot/pitot/cmd/pitot/main_test.go b/labs/15-pitot/pitot/cmd/pitot/main_test.go
index 41e00db51..a6d82105c 100644
--- a/labs/15-pitot/pitot/cmd/pitot/main_test.go
+++ b/labs/15-pitot/pitot/cmd/pitot/main_test.go
@@ -14,7 +14,7 @@ func TestDoctorReportsBoundary(t *testing.T) {
 		t.Fatalf("doctor: %v", err)
 	}
 	out := stdout.String()
-	for _, want := range []string{"local boundary", "cursor", "claude", "codex", "decoder=PASS", "unauthenticated local socket: none"} {
+	for _, want := range []string{"local boundary", "cursor", "claude", "codex", "gemini", "decoder=PASS", "unauthenticated local socket: none"} {
 		if !strings.Contains(out, want) {
 			t.Errorf("doctor output missing %q\n%s", want, out)
 		}
diff --git a/labs/15-pitot/pitot/doc.go b/labs/15-pitot/pitot/doc.go
index 0825540cd..7e86b52c6 100644
--- a/labs/15-pitot/pitot/doc.go
+++ b/labs/15-pitot/pitot/doc.go
@@ -9,7 +9,7 @@
 //
 //	schema/       public event and response types + versioned constants
 //	protocol/     newline-delimited JSON framing and state-machine helpers
-//	adapters/     Claude Code, Cursor, and Codex host boundaries
+//	adapters/     Claude Code, Cursor, Codex, and Gemini CLI host boundaries
 //	sensor/       normalization and observation pipeline (decoder)
 //	bridge/       controller routing and single-response transport
 //	projection/   full, sha256, and omit content policies
diff --git a/labs/15-pitot/pitot/e2e/e2e_hook_test.go b/labs/15-pitot/pitot/e2e/e2e_hook_test.go
index dc0e94e27..ec7dfda5d 100644
--- a/labs/15-pitot/pitot/e2e/e2e_hook_test.go
+++ b/labs/15-pitot/pitot/e2e/e2e_hook_test.go
@@ -25,6 +25,7 @@ func TestE2ESensorsConformityAcrossAllAdapters(t *testing.T) {
 		adapters.Claude: `{"hook_event_name":"PreToolUse","tool_name":"Bash","tool_input":{"command":"git status --short"}}`,
 		adapters.Cursor: `{"hook_event_name":"beforeShellExecution","command":"git status --short"}`,
 		adapters.Codex:  `{"hook_event_name":"PreToolUse","tool_name":"Bash","tool_input":{"command":"git status --short"}}`,
+		adapters.Gemini: `{"hook_event_name":"BeforeTool","tool_name":"run_shell_command","tool_input":{"command":"git status --short"}}`,
 	}
 
 	hosts := adapters.Supported()
diff --git a/labs/15-pitot/pitot/windtunnel/windtunnel_test.go b/labs/15-pitot/pitot/windtunnel/windtunnel_test.go
index 86b4f9616..95bd99d26 100644
--- a/labs/15-pitot/pitot/windtunnel/windtunnel_test.go
+++ b/labs/15-pitot/pitot/windtunnel/windtunnel_test.go
@@ -29,6 +29,7 @@ var boatstackCanonicalEvents = map[adapters.Host]string{
 	adapters.Cursor: `{"hook_event_name":"beforeShellExecution","command":"git status --short"}`,
 	adapters.Claude: `{"hook_event_name":"PreToolUse","tool_name":"Bash","tool_input":{"command":"git status --short"}}`,
 	adapters.Codex:  `{"hook_event_name":"PreToolUse","tool_name":"Bash","tool_input":{"command":"git status --short"}}`,
+	adapters.Gemini: `{"hook_event_name":"BeforeTool","tool_name":"run_shell_command","tool_input":{"command":"git status --short"}}`,
 }
 
 func TestSensorConsumesBoatstackCanonicalEvents(t *testing.T) {
diff --git a/labs/15-pitot/tests/e2e_gemini_cli_test.sh b/labs/15-pitot/tests/e2e_gemini_cli_test.sh
new file mode 100755
index 000000000..53ab3b9a4
--- /dev/null
+++ b/labs/15-pitot/tests/e2e_gemini_cli_test.sh
@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+exec labs/15-pitot/tests/e2e_unified_runner.sh "gemini"