[#18688] Remove AI co-author trailers from commit history#18689
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Add a "Commit messages" section to CLAUDE.md instructing AI tools not to include Co-authored-by trailers. These trailers propagate into squash-merge commits, making project history appear AI-authored.
noob-se7en
reviewed
Jun 5, 2026
| - Avoid deprecated APIs in new code. If you must reference one (e.g., for backward-compat serialization or to test the deprecated path), justify it with a comment. | ||
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| ## Commit messages | ||
| - Do not include `Co-authored-by` trailers that reference AI tools (e.g., Claude, Copilot). |
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For CoPilot and others, consider adding it to AGENTS.md as well.
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Great suggestion, thank you! Added the same rule to AGENTS.md in the latest commit.
Claude Code respects includeCoAuthoredBy in .claude/settings.json. Setting it to false ensures the trailer is never appended, regardless of individual user configuration.
… tools Per review feedback from noob-se7en: AGENTS.md is read by Copilot and other AI tools that don't consume .claude/settings.json. Adding the same Co-authored-by rule here ensures coverage across all AI tools.
…oAuthoredBy includeCoAuthoredBy is deprecated. Replace with the current attribution setting which controls both commit and PR trailers.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #18689 +/- ##
============================================
- Coverage 64.48% 64.48% -0.01%
Complexity 1291 1291
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Files 3371 3371
Lines 208552 208552
Branches 32570 32570
============================================
- Hits 134483 134475 -8
- Misses 63273 63284 +11
+ Partials 10796 10793 -3
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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@xiangfu0
Problem
Recent commits in the Pinot history contain AI tool trailers:
These appear in
git log, GitHub commit pages, and blame views — making it look like AI merged or authored the code.Cause
AI coding tools (Claude Code, GitHub Copilot, etc.) automatically append
Co-authored-bytrailers to commit messages by default. When PRs are squash-merged on GitHub, all trailers from individual commits are combined into the final merge commit. The result: AI attribution is permanently baked into the project's main branch history.Fix
Two layers of defense:
.claude/settings.json— adds"includeCoAuthoredBy": falseso Claude Code never appends the trailer, regardless of individual user configuration. This is the enforced, deterministic fix.CLAUDE.md— adds a "Commit messages" section instructing AI tools (including non-Claude tools like Copilot, Cursor) not to includeCo-authored-bytrailers. This covers tools that don't readsettings.json.Changes
.claude/settings.json(new file):{ "includeCoAuthoredBy": false }CLAUDE.md(new section):Fixes #18688