Bug: Sub‑agent patch created but not applied to parent workspace

[craigtsmith]

Bug: Sub-agent patch created but not applied to parent workspace

Summary

An exec sub-agent reports a successful commit and generates a patch artifact, but the change does not appear in the parent workspace. The patch exists in session artifacts but task_apply_git_patch fails to find it.

Expected

After a sub-agent completes, the committed change (or its patch) should be applied or easily available to apply via task_apply_git_patch. The new file should exist and the commit should appear in git log.

Actual

• The reported commit is not present in the parent workspace.
• The file created by the sub-agent is missing.
• A patch artifact does exist in session artifacts.
• task_apply_git_patch fails with “No git patch artifact found for this taskId.”

Repro Steps (Generic)

1. Spawn an exec based custom sub-agent to create a new file at repo root and commit it.
2. Wait for the sub-agent to finish and report a commit hash.
3. Call task_apply_git_patch with the child task ID.
4. Observe it fails with “No git patch artifact found for this taskId.”
5. In the parent workspace, run:
   • git log -5 --oneline
   • ls <new-file>
6. Observe the commit and file are missing.
7. Inspect session artifacts and find an mbox patch containing the change.

Impact

Sub-agent work appears successful but is not reflected in the parent workspace, and the normal patch application tool cannot find the patch.

Notes

This seems to affect exec sub-agents; patch artifacts exist but are not automatically applied or attached for task_apply_git_patch.

[craigtsmith]

This only appears to affect worktree base work spaces @ThomasK33 i noticed you added this feature - is it not intended to work with worktrees?

[craigtsmith]

below happens in a new repo, with the agent defined below, runtime is worktree:
(chat lines attached)

It only seems to impact custom agents with sub-agent runnable true

.mux/agents/test-file.md

---
name: test-file
base: exec
subagent:
  runnable: true
description: Create an epoch-named test file at repo root
---

You create a new test file at the repository root named with the current epoch time in seconds. The file can be empty unless the user specifies content. After creating the file, stage and commit it with a concise conventional commit message (subject under 50 characters).

chat-jsonl.txt

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[craigtsmith]

https://deepwiki.com/search/if-i-have-a-subagent-defined-l_395234d9-08c7-475c-8975-4f972d433a95?mode=codemap

[ThomasK33]

Hey @craigtsmith, thanks for opening this issue and for the detailed analysis.

You’re absolutely right (to quote Claude here), and there were a few other inheritance-related issues and shortcomings as well. The implementation in #2124 now determines whether an agent’s workspace should generate a patch based on the tools available to it, so it should also work for sub-agents and custom agents that don't derive from a base and add file editing tools directly.

[craigtsmith]

Awesome, thanks for the speedy resolution! 🫡