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feat: detect Amp, OpenHands, Factory Droid and Jules signatures - #606
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Each pattern matches what the agent writes into a commit by default: - Amp adds an Amp co-author with amp@ampcode.com and an Amp-Thread-ID trailer (https://ampcode.com/docs/cli/settings). - OpenHands commits as openhands <openhands@all-hands.dev> and stays on as a co-author when the user sets their own identity (https://docs.openhands.dev/openhands/usage/settings/application-settings). - Factory Droid adds a factory-droid[bot] co-author (https://docs.factory.com/droid-cli/settings.md). - Jules commits or co-authors as google-labs-jules[bot] (https://jules.google/docs/changelog/2026-02-19). People named Jules or Amp, and people with an all-hands.dev address, are not flagged.
Each branch of a trailer alternation sat inside its own capturing group, which the regex engine entered before the branch could reject a line, at a cost that grows with the number of groups before it. So every tool added to the catalog made each human Co-authored-by or Signed-off-by line dearer to scan: with the four tools from the previous commit, detect_ai_signatures took about 10% more instructions on a message with a human sign-off. The group is now empty and closes its branch, so it is entered only once the branch has matched, and lastindex still names the pattern that matched. That message costs the same as on main again.
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe trailer parser changes numbered capture placement. The AI-tool registry adds signatures for Amp, OpenHands, Factory Droid, and Jules, with tests covering signature recognition and false-positive inputs. ChangesAI signature recognition
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Merge Risk: ⚪ Minimal · up to No actionable merge-blocking risk is established by the supplied review evidence. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #606 +/- ##
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Coverage 100.00% 100.00%
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Merging this PR will not alter performance
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Before: commits that Amp, OpenHands, Factory Droid or Jules sign by default passed every AI attribution rule. Commit Check did not know their trailers, so a message ending in
Co-authored-by: Amp <amp@ampcode.com>passedai_attribution = "forbid", and underdiscloseit was not asked for anAssisted-by:.After: the four agents are in the signature catalog. That message now fails
forbidwithCC013 ai-attribution: Amp. Underdiscloseit fails CC014 and CC015, and the suggested fix isAssisted-by: Amp.Co-authored-by: Amp <amp@ampcode.com>andAmp-Thread-ID: https://ampcode.com/threads/T-…openhands <openhands@all-hands.dev>, and keeps that as a co-author when the user sets their own identityCo-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>(includeCoAuthoredByDroid)google-labs-jules[bot](Commit Authoring setting)How: four
KnownAiToolentries beforeGENERIC_AI, built from the existing_identity,_stamp_trailerand_nameshelpers. Names that people also have are guarded, and the tests cover each case:Ampcounts only with no address or Amp's own,Jules VerneandJules <jules@example.com>are not flagged because Jules and Droid match only their[bot]app names, and OpenHands matches by name rather than by theall-hands.devdomain its staff share.The second commit keeps the scan of human trailers as cheap as on main. Each branch of a trailer alternation used to sit inside its own capturing group, which the regex engine enters before the branch can reject a line, at a cost that grows with the number of groups before it. So every tool added made each human
Co-authored-byorSigned-off-byline dearer to scan. The group is now empty and closes its branch;lastindexstill names the matching pattern.Performance. Instructions per call, measured with callgrind (
PYTHONHASHSEED=0):test_no_signatures_in_clean_commit(human sign-off)detect_ai_signatures, human co-authorhas_ai_signature, human co-authortest_clean_message(has_ai_signature("feat: add feature"))test_generic_ai_catch_all(Assisted-by: gpt-4:openai)test_all_*catalog loopsCodSpeed reported no change on this head (622 benchmarks untouched, 4 new): it times each whole test, about 360 µs, so these per-call differences stay under its threshold. The last three rows grow with the catalog itself:
has_ai_signaturereads the message once per trailer key andAmp-Thread-IDis a new key; a disclosure that names no known tool is checked against every tool's name; and thetest_all_*tests loop over the catalog. In wall-clock terms the worst is about 1 µs per message (6.0 to 7.0 µs for the disclosure case).Not in this PR:
Checked locally:
ai_signatures.pyandai_signatures_data.pystays at 100%.forbidon this branch (exit 1); main passes it (exit 0).🤖 Generated with Claude Code
https://claude.ai/code/session_013rE6bouKaJvsRyKA4tjqCb
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