diff --git a/src/agents/embedded-agent-runner/run/attempt-session-cleanup.test.ts b/src/agents/embedded-agent-runner/run/attempt-session-cleanup.test.ts
index c53ca44b8cc0..01b883920ed2 100644
--- a/src/agents/embedded-agent-runner/run/attempt-session-cleanup.test.ts
+++ b/src/agents/embedded-agent-runner/run/attempt-session-cleanup.test.ts
@@ -97,6 +97,19 @@ describe("cleanupEmbeddedAttemptSessionPhase", () => {
     expect(input.emitDiagnosticRunCompleted).toHaveBeenCalledWith("completed", null, undefined);
   });
 
+  it("keeps compaction timeout observations abort-like only for cleanup", async () => {
+    const input = createInput();
+    const readState = input.readState;
+    input.readState = () => ({ ...readState(), timedOutDuringCompaction: true });
+
+    await cleanupEmbeddedAttemptSessionPhase(input as never);
+
+    expect(hoisted.cleanupEmbeddedAttemptResources).toHaveBeenCalledWith(
+      expect.objectContaining({ aborted: true }),
+    );
+    expect(input.emitDiagnosticRunCompleted).toHaveBeenCalledWith("completed", null, undefined);
+  });
+
   it("emits the before-agent blocked status and owner", async () => {
     const input = createInput({
       readState: () => ({
diff --git a/src/agents/embedded-agent-runner/run/attempt-session-settle.ts b/src/agents/embedded-agent-runner/run/attempt-session-settle.ts
index a923c03d468f..541119e01ff6 100644
--- a/src/agents/embedded-agent-runner/run/attempt-session-settle.ts
+++ b/src/agents/embedded-agent-runner/run/attempt-session-settle.ts
@@ -175,6 +175,8 @@ export async function cleanupEmbeddedAttemptSessionPhase(
   const finalState = input.readState();
   const cleanupFailure = cleanupError;
   const beforeAgentRunBlocked = finalState.beforeAgentRunBlockedBy !== undefined;
+  const diagnosticTerminalAborted =
+    finalState.aborted || finalState.timedOut || finalState.idleTimedOut;
   input.emitDiagnosticRunCompleted?.(
     cleanupFailure
       ? "error"
@@ -182,10 +184,7 @@ export async function cleanupEmbeddedAttemptSessionPhase(
         ? "blocked"
         : finalState.promptError
           ? "error"
-          : finalState.aborted ||
-              finalState.timedOut ||
-              finalState.idleTimedOut ||
-              finalState.timedOutDuringCompaction
+          : diagnosticTerminalAborted
             ? "aborted"
             : "completed",
     cleanupFailure ?? finalState.promptError,