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includeCoAuthoredBy: false is ignored in ACP mode (copilot --acp) #5133
Description
Describe the bug
Copilot CLI ignores "includeCoAuthoredBy": false in ACP mode (copilot --acp), so commits still get a Co-authored-by: Copilot trailer. The same prompt in copilot -p respects the setting.
Affected version
GitHub Copilot CLI 1.0.97-2 (Linux, WSL2)
Steps to reproduce the behavior
- Set
{ "includeCoAuthoredBy": false }in~/.copilot/settings.json. - In an empty git repo with
a.txt, send:Commit a.txt with git using the commit message "add a". Do nothing else. - Do this once with
copilot -p ... --allow-all-toolsand once overcopilot --acp --stdio(any ACP client, for example T3 Code). - Run
git log -1 --format=%B.
| Mode | Commit message |
|---|---|
-p |
add a ✅ |
--acp |
add a + Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> ❌ |
Expected behavior
ACP mode respects includeCoAuthoredBy: false, like -p mode.
Additional context
Related: #4576 (same setting ignored by subagents), #4700 (another settings.json setting not honored in ACP mode).
Reacted by Kurt Preston
Activity
KurtPreston commentedon Oct 22, 2026
Still occurring in 1.0.103 (macOS, darwin-arm64) from Zed’s agent panel. The session’s system.message event shows
metadata.variables.gitCommitTrailer = {"clientName": "zed", "coauthorEnabled": true}even with"includeCoAuthoredBy": falseset.devm33 commentedon Nov 3, 2026
This should be fixed in Copilot CLI 1.0.106-5, the first public release containing the fix: https://github.com/github/copilot-cli/releases/tag/v1.0.106-5 (prerelease, published November 3, 2026). Its release notes explicitly mention honoring
includeCoAuthoredBy: falsein ACP mode.Verified against that published build using an isolated ACP profile and a local test model: with
includeCoAuthoredBy: false, the model receives no instruction to add the Copilot co-author trailer. The same probe on 1.0.106-3 still receives that instruction. Restart the ACP server after changing the setting.Closing as fixed. Please reopen if this persists on this version or newer.
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