🏗️🔧：refuse a sign-off that names a tool - #924
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Inline comments:
In `@build/shared/commit-message.mts`:
- Around line 142-143: Update the TOOL_IDENTITY regular expression so its [bot]
branch only matches when [bot] ends the display name or email local part, using
a lookahead for @ or optional whitespace followed by an optional angle-bracketed
address and the end of the trailer value. Preserve the existing noreply domain
and tool-name branches unchanged.
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CONTRIBUTING.mdbuild/shared/commit-message.mtsbuild/shared/commit-message.test.mts
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This repository keeps its own copy of the commit message rules, beside the ones in OpenINF/.github and OpenINF/sdk. All three were the same file, and the sign-off hole was in all three. Leaving this one behind would have been the worse half of the bargain: the handbook page that documents the rule is published from here, so the page and the checker sitting next to it in the same repository would have disagreed. That disagreement is what the page's other commit is about. `Co-authored-by:` already refused a tool. `checkSignOff` only asks whether the sign-off matches the commit's author, which an agent committing under its own identity satisfies, so the Developer Certificate of Origin could be certified by a program. It is refused in either trailer now, whoever the author is, and `[bot]` is read where an account name ends rather than anywhere in the value. Ported whole from OpenINF/.github#924, so the three copies are identical again. Signed-off-by: Derek Lewis <DerekNonGeneric@inf.is> Assisted-by: Claude-Code:claude-opus-5
`Co-authored-by:` was taught to refuse a tool. The other trailer that
names a person was left to `checkSignOff`, which asks one question:
does the sign-off match the commit's author.
That catches a tool signing on somebody else's behalf and nothing else.
An agent committing under its own git identity is the author, and
`--signoff` copies that identity into the trailer, so the two agree:
Author: Claude <noreply@anthropic.com>
Signed-off-by: Claude <noreply@anthropic.com>
Every check passed. The Developer Certificate of Origin had been
certified by a program, which is the one thing a sign-off cannot say,
and it passed for being consistent rather than for being right.
So the pattern that already refuses a tool as a co-author refuses one
as a signer too, whoever the author is. The two together leave an
agent-authored commit no spelling that lands: sign off as itself and
the trailer names a tool, sign off as anybody else and it is not the
author. Nothing new has to know what an author is.
It sits in `validateCommitMessage` rather than beside the comparison in
`checkSignOff`, because the question needs no author to answer and the
commit queue reads a message through those rules before it lands it.
`[bot]` is read where an account name ends — before the `@` of an
address, or at the end of the value, with or without an angle-bracketed
address after it — rather than anywhere in the value. GitHub reserves
the suffix so that no account can be named with it, but a trailer is
free text and not an account name, so matching it anywhere also found
one sitting inside a person's: `Ada [bot] Smith <ada@example.com>`.
That cost little while only `Co-authored-by:` was read this way, and
costs more now that a sign-off is: a miscredited co-author can be
dropped from the message and the commit still lands, while a false
positive on a sign-off leaves a contributor with nothing to write.
`CONTRIBUTING.md` had said an assistant signs nothing and left the rest
to be inferred. It now says the author has to be a person as well,
which is the sentence whose absence the hole was made of: an agent
reading the old text could satisfy every rule in it by making itself
the author. An agent committing for somebody commits as them.
Signed-off-by: Derek Lewis <DerekNonGeneric@inf.is>
Assisted-by: Claude-Code:claude-opus-5
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The sign-off section explained that a tool cannot certify the Developer
Certificate of Origin "which is why the check compares the name against
the author". That is not why, and the sentence told a reader the rule
was enforced when it was not. Comparing the two catches a tool signing
on somebody else's behalf. It has nothing to say when the tool is the
author, which is the case an agent arrives in:
Author: Claude <noreply@anthropic.com>
Signed-off-by: Claude <noreply@anthropic.com>
The page said elsewhere that an assistant gets no `Signed-off-by:`, so
the rule was here. What was missing is the sentence the rule rests on:
a commit's author has to be a person. Without it an agent can satisfy
every other sentence on the page by making itself the author, and read
the advice to keep `git config` as the identity you commit under as
telling it to.
So the sign-off section says what the check asks, both halves of it,
and the assistant section says who may be an author and what an agent
committing for somebody does instead.
This repository keeps its own copy of the commit message rules, beside
the ones in OpenINF/.github and OpenINF/sdk. All three were the same
file, and the sign-off hole was in all three. Leaving this one behind
would have been the worse half of the bargain: the handbook page is
published from here, so the page and the checker sitting next to it in
the same repository would have disagreed. The pattern that refuses a
tool as a co-author refuses one as a signer too now, whoever the author
is, and `[bot]` is read where an account name ends rather than anywhere
in the value. Ported whole from OpenINF/.github#924, so the three
copies are identical again.
The one `--` in the page is an em dash now. It sits in a sentence this
change was rewriting anyway, and the handbook's own page on dashes has
it under "not recommended".
Signed-off-by: Derek Lewis <DerekNonGeneric@inf.is>
Assisted-by: Claude-Code:claude-opus-5
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The sign-off section explained that a tool cannot certify the Developer
Certificate of Origin "which is why the check compares the name against
the author". That is not why, and the sentence told a reader the rule
was enforced when it was not. Comparing the two catches a tool signing
on somebody else's behalf. It has nothing to say when the tool is the
author, which is the case an agent arrives in:
Author: Claude <noreply@anthropic.com>
Signed-off-by: Claude <noreply@anthropic.com>
The page said elsewhere that an assistant gets no `Signed-off-by:`, so
the rule was here. What was missing is the sentence the rule rests on:
a commit's author has to be a person. Without it an agent can satisfy
every other sentence on the page by making itself the author, and read
the advice to keep `git config` as the identity you commit under as
telling it to.
So the sign-off section says what the check asks, both halves of it,
and the assistant section says who may be an author and what an agent
committing for somebody does instead.
This repository keeps its own copy of the commit message rules, beside
the ones in OpenINF/.github and OpenINF/sdk. All three were the same
file, and the sign-off hole was in all three. Leaving this one behind
would have been the worse half of the bargain: the handbook page is
published from here, so the page and the checker sitting next to it in
the same repository would have disagreed. The pattern that refuses a
tool as a co-author refuses one as a signer too now, whoever the author
is, and `[bot]` is read where an account name ends rather than anywhere
in the value. Ported whole from OpenINF/.github#924, so the three
copies are identical again.
The one `--` in the page is an em dash now. It sits in a sentence this
change was rewriting anyway, and the handbook's own page on dashes has
it under "not recommended".
Signed-off-by: Derek Lewis <DerekNonGeneric@inf.is>
Assisted-by: Claude-Code:claude-opus-5
PR-URL: #1907
openinf-commit-queue
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the
🚀 Status: Commit Queue
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Requested by DerekNonGeneric
Before: an agent could commit as itself, sign off as itself, and pass every
check.
checkSignOffasked one question — does the sign-off match the commit'sauthor — and an agent running under its own git identity is the author, so the
two agreed:
Nothing was inconsistent, so nothing objected, and a program stood in the
history certifying the Developer Certificate of Origin. The
Co-authored-by:half of the rule had been enforced since #916; the
Signed-off-by:half wasprose in
CONTRIBUTING.mdand nowhere in the code.After: a
Signed-off-by:naming an assistant or a bot account is refusedwhoever the author is, by the same pattern that already refuses one as a
co-author. Together the two checks leave an agent-authored commit no spelling
that lands — sign off as itself and the trailer names a tool, sign off as
anybody else and it is not the author — without anything new having to decide
what an author is.
How:
TOOL_COAUTHORis nowTOOL_IDENTITYand is applied toSigned-off-byas well as
Co-authored-by, incheckTrailersrather than beside thecomparison in
checkSignOff. That is deliberate: the question needs no authorto answer, and
land-pull-request.mtsruns a message throughvalidateCommitMessagebefore the queue lands it, so the rule covers thesquashed commit too. Seven tests cover it, one of them pinning the loophole
itself so the division of labour between the two functions stays documented.
[bot]is read where an account name ends, so it cannot match inside aperson's name — a false positive there would block a sign-off, which unlike a
co-author credit cannot be dropped.
CONTRIBUTING.mdgains the sentence whose absence the hole was made of: theauthor of a commit has to be a person, and an agent committing on somebody's
behalf commits as them. It had said an assistant "signs nothing" and left the
rest to be inferred, which an agent reading the rules to the letter does not do.
The handbook page says the same thing in OpenINF/openinf.github.io#1907, and
OpenINF/sdk#67 ports this to that repository's own copy of these rules. All
three repositories carry a byte-identical copy of this file and nothing syncs
them, so the three land together.
Verified with
nps verify.unit(118 pass),verify.ts,verify.md,verify.spellingandverify.commitson this branch.Summary by CodeRabbit
Documentation
Assisted-by:as the mechanism for disclosing assistant involvement.Bug Fixes
Signed-off-by:andCo-authored-by:trailers.[bot]in non-identity contexts.Tests