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codex - 💡(How to fix) Fix Codex app: subagent close request triggers "agent loop died unexpectedly" and repeated message submit failures

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While using the Codex desktop app, trying to ask subagents to close caused task creation/message submission to fail repeatedly.

Error Message

Error shown

Error creating task failed to start turn: internal error; agent loop died unexpectedly Error submitting message The app should either close/stop the subagents cleanly or return a recoverable user-facing error without breaking message submission in the thread. The app displayed the internal error agent loop died unexpectedly, and subsequent attempts to submit messages showed Error submitting message repeatedly.

Root Cause

While using the Codex desktop app, trying to ask subagents to close caused task creation/message submission to fail repeatedly.

Code Example

Error creating task
failed to start turn: internal error; agent loop died unexpectedly

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Error submitting message

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0cb0ad3a-6818-4bdc-bf26-8e2ac6ba158e
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Summary

While using the Codex desktop app, trying to ask subagents to close caused task creation/message submission to fail repeatedly.

Error shown

Error creating task
failed to start turn: internal error; agent loop died unexpectedly

The thread then showed repeated:

Error submitting message

Trigger / context

  • Action attempted: asked subagents to close / wrap up.
  • Surface: Codex desktop app on macOS.
  • Model/UI state visible in screenshot: 5.5 Extra High, Custom profile.
  • Approximate time: 2026-05-21 around 8:55 PM ET.

Feedback trace

The app uploaded a performance trace and showed this Feedback ID:

0cb0ad3a-6818-4bdc-bf26-8e2ac6ba158e

Expected behavior

The app should either close/stop the subagents cleanly or return a recoverable user-facing error without breaking message submission in the thread.

Actual behavior

The app displayed the internal error agent loop died unexpectedly, and subsequent attempts to submit messages showed Error submitting message repeatedly.

Related issues checked

I found some broadly similar open issues around task creation/app failures, but did not find this exact subagent-close trigger with the uploaded feedback trace ID.

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FAQ

Expected behavior

The app should either close/stop the subagents cleanly or return a recoverable user-facing error without breaking message submission in the thread.

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codex - 💡(How to fix) Fix Codex app: subagent close request triggers "agent loop died unexpectedly" and repeated message submit failures