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Interrupting the main agent does not stop background subagents #28738
Description
Description
When using experimental native background subagents, manually interrupting the main agent does not appear to stop the background subagent.
For example, if a background task is running and I click the UI interrupt/stop control, or press Esc to interrupt the main agent, the main agent stops but the background subagent continues running.
I found related issues like #21176 and #13916, but this report is narrower: it is about the current task(background=true) behavior when the user manually interrupts the parent/main agent.
Plugins
No plugin is required for this behavior. This appears to be on the native background subagent path; plugins do not appear to affect the repro.
OpenCode version
1.15.6
Steps to reproduce
- Enable experimental native background subagents.
- Start a background subagent with
task(background=true). - While the background subagent is still running, interrupt the main agent from the UI stop/interrupt control or by pressing Esc.
- Observe that the main agent is interrupted, but the background subagent continues running.
Expected: one of these behaviors would make the lifecycle clearer:
A. Interrupting the main agent also cancels its running background subagents.
B. The main agent has an explicit tool/control to cancel a running background subagent by task id.
Screenshot and/or share link
N/A for now.
Operating System
Ubuntu 24.04.4 LTS on WSL
Terminal
Not terminal-specific.
Activity
github-actions commentedon May 21, 2026
This issue might be a duplicate of existing issues. Please check:
wanyaoluo commentedon May 21, 2026
I checked #23534. It looks related, but I don't think it is the same repro.
#23534 was reported on OpenCode 1.14.19 with an external plugin. In v1.14.19, the native task tool did not yet expose the
backgroundparameter, andtask_statuswas not present.This issue is specifically about the experimental native background subagent path in 1.15.6:
task(background=true)/task_status. When the parent/main agent is interrupted via UI stop or Esc, the native background task keeps running.jamesjmartin commentedon May 22, 2026
I believe this is due to the abort path in packages/opencode/src/session/run-state.ts killing the background wrapper fiber, but not the child session runner.
Related: The only way I've found to kill background tasks (besides exiting opencode) is to make an API call to /session/:id/abort with the task_id. The model has no knowledge of that path nor the port.
github-actions commentedon Jul 22, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.
MatteoGauthier commentedon Sep 24, 2026
Just tested today with OpenCode Desktop
Version 2.0.16 (2.0.16).Subagents aren't stopped when the main session is interrupted. Also, I think it would be nice to have a way to stop the subagents or subsessions.