Error resuming chat after background Task finishes (Multitask / subagents) — Request ID 826cd8d6-4508-47b6-b438-11dfa6395d63

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Where does the bug appear (feature/product)?

Cursor CLI

Describe the Bug

Environment

  • Product: Cursor Desktop (Agent chat)
  • OS: Windows 10 (build 10.0.26200)
  • Cursor version: [paste from Help → About]
  • Request ID: 826cd8d6-4508-47b6-b438-11dfa6395d63

Summary

Parent Agent chat fails to reattach after a background Task/subagent finishes. Toast appears; the parent turn does not continue on its own.

Steps to reproduce

  1. Open a long Agent chat in Cursor Desktop on Windows.
  2. Use Multitask Mode so Agent launches many background Task subagents in parallel.
  3. Interrupt / resume the parent agent while those Tasks are still running or finishing.
  4. Leave the chat (or keep it open) until a background task completes.
  5. Observe the toast when Cursor tries to wake/resume the parent chat.

Expected

When a background task finishes, the parent Agent chat should resume automatically and continue the turn (or retry quietly).

Actual

Dialog:

  • Title: Error resuming chat
  • Body: A background task finished, but the chat couldn’t resume. Try again in a moment.
  • Request ID: 826cd8d6-4508-47b6-b438-11dfa6395d63
  • Buttons: Copy ID, Resume

Clicking Resume (or sending a follow-up) is needed; the toast can repeat as more background Tasks finish. This is the IDE chat, not a website/hosting issue.

Extra context

Same wording as prior reports of parent-chat reattach failing after a background job completes. This session also had a long transcript and a looping-tool-call flag before the resume error.

Screenshot

[attach the Error resuming chat toast]

Steps to Reproduce

  1. Open a long Agent chat in Cursor Desktop on Windows.
  2. Use Multitask Mode so Agent launches many background Task subagents in parallel.
  3. Interrupt / resume the parent agent while those Tasks are still running or finishing.
  4. Leave the parent chat idle until a background task completes.
  5. Observe the toast when Cursor tries to wake/resume the parent chat. Click Resume if shown.

Expected Behavior

Parent Agent chat reattaches automatically and shows the subagent result without Error resuming chat.

Operating System

Windows 10/11

Version Information

Windows Cursor Desktop, version unknown unless visible in Help About

For AI issues: which model did you use?

Auto (Agent)

For AI issues: add Request ID with privacy disabled

826cd8d6-4508-47b6-b438-11dfa6395d63

Additional Information

Actual: Error resuming chat — A background task finished, but the chat couldn’t resume. Try again in a moment. Request ID 826cd8d6-4508-47b6-b438-11dfa6395d63. Copy ID used. Not a website/hosting issue.

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

5

Hey, thanks for the detailed report. This is a known issue we’re tracking. When a background Task finishes while the parent chat is idle, the automatic wake-up that should continue the turn can sometimes fail, and instead of a quiet retry you’ll see the Error resuming chat card.

Good news is nothing is lost. The results from the finished Task are saved, and clicking Resume (or sending any next message) will deliver them into the chat. That seems to match what you saw. Based on the Request ID, the turn completed correctly on our side, so this looks like a transient case, not a usage or rate limit failure.

The card can show up again if multiple background Tasks finish back to back, but each Resume click will pick up everything that’s accumulated so far.

The same symptom is discussed here: Error resuming chat after long background Shell finishes (Request ID 57b6008d-8c6b-4cce-86ac-59caf380ce4c)

No timeline yet, but I’ll share an update if one shows up. Let me know if the behavior differs from what I described, for example if Task results are actually missing after Resume.