diff --git a/src/agents/embedded-agent-runner/run/attempt-abort.test.ts b/src/agents/embedded-agent-runner/run/attempt-abort.test.ts
new file mode 100644
index 00000000000..b30ed1aca0b
--- /dev/null
+++ b/src/agents/embedded-agent-runner/run/attempt-abort.test.ts
@@ -0,0 +1,44 @@
+import { describe, expect, it, vi } from "vitest";
+import { releaseEmbeddedAttemptSessionLockForAbort } from "./attempt-abort.js";
+
+describe("releaseEmbeddedAttemptSessionLockForAbort", () => {
+  it("releases the retained session lock for manual aborts", async () => {
+    const releaseHeldLockForAbort = vi.fn(async () => {});
+    const warn = vi.fn();
+
+    releaseEmbeddedAttemptSessionLockForAbort({
+      sessionLockController: { releaseHeldLockForAbort },
+      log: { warn },
+      runId: "run-manual",
+      abortKind: "abort",
+    });
+
+    await Promise.resolve();
+
+    expect(releaseHeldLockForAbort).toHaveBeenCalledTimes(1);
+    expect(warn).not.toHaveBeenCalled();
+  });
+
+  it("logs release failures without throwing from the abort path", async () => {
+    const releaseError = new Error("locked");
+    const releaseHeldLockForAbort = vi.fn(async () => {
+      throw releaseError;
+    });
+    const warn = vi.fn();
+
+    releaseEmbeddedAttemptSessionLockForAbort({
+      sessionLockController: { releaseHeldLockForAbort },
+      log: { warn },
+      runId: "run-timeout",
+      abortKind: "timeout abort",
+    });
+
+    await Promise.resolve();
+    await Promise.resolve();
+
+    expect(releaseHeldLockForAbort).toHaveBeenCalledTimes(1);
+    expect(warn).toHaveBeenCalledWith(
+      "failed to release session lock on timeout abort: runId=run-timeout Error: locked",
+    );
+  });
+});
diff --git a/src/agents/embedded-agent-runner/run/attempt-abort.ts b/src/agents/embedded-agent-runner/run/attempt-abort.ts
new file mode 100644
index 00000000000..db44dfc0e61
--- /dev/null
+++ b/src/agents/embedded-agent-runner/run/attempt-abort.ts
@@ -0,0 +1,18 @@
+import type { EmbeddedAttemptSessionLockController } from "./attempt.session-lock.js";
+
+type AbortLockReleaseLog = {
+  warn(message: string): void;
+};
+
+export function releaseEmbeddedAttemptSessionLockForAbort(params: {
+  sessionLockController: Pick<EmbeddedAttemptSessionLockController, "releaseHeldLockForAbort">;
+  log: AbortLockReleaseLog;
+  runId: string;
+  abortKind: "abort" | "timeout abort";
+}): void {
+  void params.sessionLockController.releaseHeldLockForAbort().catch((err) => {
+    params.log.warn(
+      `failed to release session lock on ${params.abortKind}: runId=${params.runId} ${String(err)}`,
+    );
+  });
+}
diff --git a/src/agents/embedded-agent-runner/run/attempt.ts b/src/agents/embedded-agent-runner/run/attempt.ts
index 4899efdb26c..c7a765e7d2d 100644
--- a/src/agents/embedded-agent-runner/run/attempt.ts
+++ b/src/agents/embedded-agent-runner/run/attempt.ts
@@ -308,6 +308,7 @@ import {
   rotateTranscriptAfterCompaction,
   shouldRotateCompactionTranscript,
 } from "../compaction-successor-transcript.js";
+import { releaseEmbeddedAttemptSessionLockForAbort } from "./attempt-abort.js";
 import { resolveAttemptWorkspaceBootstrapRouting } from "./attempt-bootstrap-routing.js";
 import { configureEmbeddedAttemptHttpRuntime } from "./attempt-http-runtime.js";
 import {
@@ -2984,12 +2985,13 @@ export async function runEmbeddedAttempt(
             sessionFile: params.sessionFile,
             reason: "timeout",
           });
-          void sessionLockController.releaseHeldLockForAbort().catch((err) => {
-            log.warn(
-              `failed to release session lock on timeout abort: runId=${params.runId} ${String(err)}`,
-            );
-          });
         }
+        releaseEmbeddedAttemptSessionLockForAbort({
+          sessionLockController,
+          log,
+          runId: params.runId,
+          abortKind: isTimeout ? "timeout abort" : "abort",
+        });
       };
       abortRunForExternalSignal = abortRun;
       const idleTimeoutTrigger: ((error: Error) => void) | undefined = (error) => {