Bug

The gateway crashes with an unhandled promise rejection when an embedded agent run times out after timeoutMs (default 600s):

02:29:59 [agent/embedded] embedded run timeout: runId=e3beb470-d7e8-4875-b96f-d922db3b0ffb sessionId=1cf5fc39-e717-4d2e-8047-c828f228f515 timeoutMs=600000
02:29:59 [clawdbot] Unhandled promise rejection: AbortError: This operation was aborted
    at node:internal/deps/undici/undici:14902:13
    at processTicksAndRejections (node:internal/process/task_queues:105:5)

The process then exits via process.exit(1) in infra/unhandled-rejections.js:27.

Root Cause

In agents/pi-embedded-runner/run/attempt.js, the abortRun function (line ~472-483) calls:

void activeSession.abort();

When the timeout fires, abortRun(true) is invoked, which:

1. Calls runAbortController.abort(makeTimeoutAbortReason()) — this correctly propagates through the abortable() wrapper and is caught at line ~658-660.
2. Calls void activeSession.abort() — this internally cancels in-flight HTTP requests (fetch calls to the AI provider via Node's undici). Those fetch requests reject with AbortError: This operation was aborted. Since the promise from activeSession.abort() is discarded with void, the rejection is unhandled.

The unhandled rejection handler at infra/unhandled-rejections.js:22-28 does not filter AbortErrors, so it crashes the process.

Suggested Fix

Replace:

void activeSession.abort();

With:

activeSession.abort().catch(() => { /* intentional: abort errors during timeout are expected */ });

Alternatively, the registerUnhandledRejectionHandler API could be used to register a handler that suppresses AbortError rejections originating from timeout aborts, but catching at the call site is more precise.

Environment

• clawdbot 2026.1.24-3 (885167d)
• Node v22.22.0 (undici built-in fetch)
• macOS

Steps to Reproduce

1. Start clawdbot gateway
2. Trigger an embedded agent run (e.g. via webchat)
3. Let it run until the timeout fires (600s by default, or configure a shorter timeoutMs)
4. The process crashes with the AbortError shown above