diff --git a/plugin/scripts/stop.mjs b/plugin/scripts/stop.mjs
index 03d30c64f..bf5b2e719 100755
--- a/plugin/scripts/stop.mjs
+++ b/plugin/scripts/stop.mjs
@@ -29,12 +29,6 @@ async function main() {
 		body: JSON.stringify({ sessionId }),
 		signal: AbortSignal.timeout(12e4)
 	}).catch(() => {});
-	fetch(`${REST_URL}/agentmemory/session/end`, {
-		method: "POST",
-		headers: authHeaders(),
-		body: JSON.stringify({ sessionId }),
-		signal: AbortSignal.timeout(5e3)
-	}).catch(() => {});
 	setTimeout(() => process.exit(0), 1500).unref();
 }
 main();
diff --git a/src/hooks/stop.ts b/src/hooks/stop.ts
index 4103796e0..8f8a9ffcd 100644
--- a/src/hooks/stop.ts
+++ b/src/hooks/stop.ts
@@ -46,12 +46,17 @@ async function main() {
     signal: AbortSignal.timeout(120000),
   }).catch(() => {});
 
-  fetch(`${REST_URL}/agentmemory/session/end`, {
-    method: "POST",
-    headers: authHeaders(),
-    body: JSON.stringify({ sessionId }),
-    signal: AbortSignal.timeout(5000),
-  }).catch(() => {});
+  // TODO(codex-session-end): Codex does not fire a separate SessionEnd event,
+  // so its Stop hook was the only signal to close the session lifecycle.
+  // We removed the /session/end call here because Claude Code (and other agents)
+  // fire Stop after every assistant turn, causing premature session completion.
+  // Re-add once a reliable Codex identifier is available in the hook payload.
+  // fetch(`${REST_URL}/agentmemory/session/end`, {
+  //   method: "POST",
+  //   headers: authHeaders(),
+  //   body: JSON.stringify({ sessionId }),
+  //   signal: AbortSignal.timeout(5000),
+  // }).catch(() => {});
 
   setTimeout(() => process.exit(0), 1500).unref();
 }
diff --git a/test/copilot-plugin.test.ts b/test/copilot-plugin.test.ts
index cd01b2d87..5fe04f022 100644
--- a/test/copilot-plugin.test.ts
+++ b/test/copilot-plugin.test.ts
@@ -377,4 +377,16 @@ describe("Copilot hook scripts", () => {
       },
     });
   });
+
+  it("stop calls /summarize but not /session/end", async () => {
+    const result = await runHook("scripts/stop.mjs", {
+      sessionId: "copilot-session",
+      cwd: "C:\\repo",
+    });
+
+    expect(result.stdout).toBe("");
+    const paths = result.requests.map((r) => r.path);
+    expect(paths).toContain("/agentmemory/summarize");
+    expect(paths).not.toContain("/agentmemory/session/end");
+  });
 });