🏗️🔧：keep a tool out of the author credit - #38
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. 📝 WalkthroughWalkthroughThe commit-message validator now detects tool and bot identities in ChangesCo-author trailer validation
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The commit-message check and its documented disclosure rule are ready to merge; no concrete current-head risk remains. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@build/shared/commit-message.mts`:
- Line 393: Update trailerBlockOf/checkTrailers so continuation lines are
unfolded and preserved in trailer values before TOOL_COAUTHOR.test examines
found.value, ensuring folded Co-authored-by assistant addresses are detected;
add a regression test covering that folded address.
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CONTRIBUTING.mdbuild/shared/commit-message.mtsbuild/shared/commit-message.test.mts
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The handbook has always said `Co-authored-by:` is for people and that an
assistant belongs in `Assisted-by:` instead. Nothing checked it, and a
commit went out this week crediting a model as a co-author.
That is not a formatting slip. Authorship is a claim only a person can
make: the Developer Certificate of Origin is certified by whoever wrote
the code, and a tool certifies nothing. The trailer that discloses one
says what was used. The trailer that credits one says who is answerable,
and a model cannot be.
An agent writing its own commit message reaches for that trailer out of
habit, because that is what most of the code it learnt from does, and a
reviewer reading a long message is exactly who does not notice one line
at the bottom. Once it lands it is in the history for good.
So the check refuses it, on three things: the `[bot]` suffix, which
GitHub reserves so that no person can hold it; the addresses the agents
commit under, which are theirs alone and not the ones their staff use;
and a handful of product names. Only the last can reach a person, and
realistically only `claude`, which is also a name people have. That is
the trade, and if it ever refuses a real co-author the pattern gets
narrowed rather than the credit dropped.
Renovate and Dependabot are unaffected, since their commits are skipped
whole and never reach this. Nor does an agent that commits as a `[bot]`
account need naming, which is why Devin and Gemini are absent: both are
ordinary names before they are products.
A trailer whose value runs onto an indented line is read whole, which it
was not. The continuation was dropped before any check saw it, so these
two were one trailer to git and `git interpret-trailers --parse` printed
both as the same line, but only the first was refused:
Co-authored-by: Some Person <noreply@anthropic.com>
Co-authored-by: Some Person
<noreply@anthropic.com>
The address is the half that says who a trailer names, it sits at the
end, and so it is the half a fold hides. Sign-off had the same hole from
the other side: a wrapped `Signed-off-by:` lost the address the author
is compared against. The continuation is now joined onto the value the
way git joins it.
Signed-off-by: Derek Lewis <DerekNonGeneric@inf.is>
Assisted-by: Claude-Code:claude-opus-5
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Summary
CONTRIBUTING.mdhas always said an assistant discloses itself withAssisted-by:and signs nothing. Nothing checked the other half of that:Co-authored-by:is for people, and a commit crediting a model as a co-author got as far as an open pull request this week.Authorship is a claim only a person can make. The Developer Certificate of Origin is certified by whoever wrote the code, and a tool certifies nothing.
Assisted-by:says what was used.Co-authored-by:says who is answerable, and a model cannot be.Why a check and not a review note
An agent writing its own commit message reaches for that trailer out of habit, because most of the code it learnt from does. A reviewer reading a long message is exactly who does not notice one line at the bottom. Once it lands it is in the history for good.
What it refuses
A
Co-authored-by:whose value matches an assistant's address, a[bot]account, or one of the agent product names that reach this project.It refuses on three things: the
[bot]suffix, which GitHub reserves so that no person can hold it; the addresses the agents commit under, which are theirs alone and not the ones their staff use; and a handful of product names. Only the last can reach a person, and realistically onlyclaude, which is also a name people have. That is the trade, and if it ever refuses a real co-author the pattern gets narrowed rather than the credit dropped.An agent whose integration commits as a
[bot]account needs no name in the list, which is why Devin and Gemini are absent: both are ordinary names before they are products. Renovate and Dependabot are unaffected either way, since their commits are skipped whole and never reach this check.Validation
[bot]account fails, and two confirming a person is not caught -- somebody at one of those companies, and somebody whose given name an agent also goes bypnpm run build,test,lint,lint:format,lint:knip,lint:spelling,lint:commitspassNo changeset: this changes a check and a contributor document, not anything a consumer installs.
Related
OpenINF/openinf.github.io#1899 makes the identical change to its copy of this module, and to the handbook page that both repositories point contributors at.
build/shared/commit-message.mtsis byte-identical in the two, and stays that way.Summary by CodeRabbit
Documentation
Bug Fixes
Co-authored-bytrailers.Tests