diff --git a/src/agents/subagent-registry-completion.test.ts b/src/agents/subagent-registry-completion.test.ts
index 54685caf88f..28b0fa98c10 100644
--- a/src/agents/subagent-registry-completion.test.ts
+++ b/src/agents/subagent-registry-completion.test.ts
@@ -68,6 +68,18 @@ describe("emitSubagentEndedHookOnce", () => {
         { status: "ok" },
       ),
     ).toBe(true);
+    expect(
+      mod.shouldUpdateRunOutcome(
+        { status: "ok" },
+        { status: "ok", startedAt: 1_000, endedAt: 2_000, elapsedMs: 1_000 },
+      ),
+    ).toBe(true);
+    expect(
+      mod.shouldUpdateRunOutcome(
+        { status: "ok", startedAt: 1_000, endedAt: 2_000, elapsedMs: 1_000 },
+        { status: "ok" },
+      ),
+    ).toBe(false);
   });
 
   it("records ended hook marker even when no subagent_ended hooks are registered", async () => {
diff --git a/src/agents/subagent-registry-completion.ts b/src/agents/subagent-registry-completion.ts
index 3c887e93bab..da3ad3999b9 100644
--- a/src/agents/subagent-registry-completion.ts
+++ b/src/agents/subagent-registry-completion.ts
@@ -42,6 +42,15 @@ export function runOutcomeHasTiming(outcome: SubagentRunOutcome | undefined): bo
   );
 }
 
+export function shouldUpdateRunOutcome(
+  current: SubagentRunOutcome | undefined,
+  next: SubagentRunOutcome | undefined,
+): boolean {
+  return (
+    !runOutcomesEqual(current, next) || (!runOutcomeHasTiming(current) && runOutcomeHasTiming(next))
+  );
+}
+
 export function resolveLifecycleOutcomeFromRunOutcome(
   outcome: SubagentRunOutcome | undefined,
 ): SubagentLifecycleEndedOutcome {
diff --git a/src/agents/subagent-registry-lifecycle.ts b/src/agents/subagent-registry-lifecycle.ts
index 2caa54831c7..6d89a3265ca 100644
--- a/src/agents/subagent-registry-lifecycle.ts
+++ b/src/agents/subagent-registry-lifecycle.ts
@@ -23,7 +23,7 @@ import {
   resolveCleanupCompletionReason,
   resolveDeferredCleanupDecision,
 } from "./subagent-registry-cleanup.js";
-import { runOutcomeHasTiming, runOutcomesEqual } from "./subagent-registry-completion.js";
+import { shouldUpdateRunOutcome } from "./subagent-registry-completion.js";
 import {
   ANNOUNCE_COMPLETION_HARD_EXPIRY_MS,
   ANNOUNCE_EXPIRY_MS,
@@ -594,10 +594,7 @@ export function createSubagentRegistryLifecycleController(params: {
       startedAt: entry.startedAt,
       endedAt,
     });
-    const shouldPersistOutcome =
-      !runOutcomesEqual(entry.outcome, outcome) ||
-      (!runOutcomeHasTiming(entry.outcome) && runOutcomeHasTiming(outcome));
-    if (shouldPersistOutcome) {
+    if (shouldUpdateRunOutcome(entry.outcome, outcome)) {
       entry.outcome = outcome;
       mutated = true;
     }