Files
msd-core/.changeset/3503-diff-base-scope-anchor.md
Tom Boucher 49b60070a0 fix(#3503): derive the code-review diff base from GSD's own commit scopes, not prose mentions (#3526)
* fix(#3503): derive the code-review diff base from GSD's own commit scopes, not prose mentions

The #2989/#3191 anchor ('[Pp]hase N' + POSIX boundary) still resolved the
phase diff base ~4 phases early on real repos: git log --grep searches full
commit bodies and tail -1 keeps the OLDEST match, so a single prose mention
anywhere in history (a planning commit forward-referencing the phase per
D-09, a doc commit using '### Phase N' as a format example) silently
captured the base — while GSD's own commits, which use conventional-commit
scopes (docs(phase-6):, feat(6-01):, docs(06):) and never contain the
literal 'Phase N', were matched by nothing. The wrong base inflated the
Tier-3 file-list fallback, the #2666 SUMMARY/diff union, the reviewer
agent's diff_base, and fallow's --changed-since scope, with no warning.

All three derivation sites (Tier-3 fallback, spawn_reviewer, fallow
structural pre-pass) now grep for the subject-line conventional-commit
phase scope under --extended-regexp, in lockstep per the #3191 contract:

  ^[[:alpha:]]+!?\((phase-)?(N|0N)(-[0-9]+)?\)!?:

PHASE_SCOPE_NUM accepts both padded and unpadded phase spellings because
workflows emit the unpadded roadmap number (docs(phase-6):) while
code-review greps the zero-padded PADDED_PHASE. The ^ anchor makes it a
subject-line match, so commit-body prose can never capture the base. The
POSIX-ERE portability rule (#3191, no \b), the fail-closed empty-result
warning, and the --files escape hatch are preserved: histories with no
scope-style commits yield no base instead of an arbitrary one.

Tests (tests/code-review-pipeline-regression.test.cjs): new Bug 6 (#3503)
block executes the SHIPPED bash from all three sites against a real git
fixture whose history carries every prose false-positive class from the
issue — red pre-fix (the prose-body commits captured the base at every
site), green post-fix. The Bug 5 (#3191) block is updated to the scope
anchor contract (its fixtures bound to the shipped text), and its T6
docs-parity guard now enforces the identical scope-anchored grep plus the
PHASE_SCOPE_NUM prep at every git-log site.

Emitted drift: 3503-diff-base-scope-anchor.json acks the deliberate
workflow growth; the spent 3191-unanchored-grep-sites.json fragment (its
code-review.md entry was consumed when #3191 merged) is pruned.

* chore(#3503): add changeset fragment for PR #3526

* fix(#3503): rebase onto next and correct the emitted-drift ack

Rebase onto origin/next@6badb839 (PR freshness: #3514/#3516 landed after
this branch was cut). Post-rebase the attribution gate classifies the two
source-path ack entries (gsd-core/workflows/code-review.md, structural-
pre-pass.md) as stale — source files present in the diff are identity-
attributed by the table, so only the emitted code-review.md basename
growth needs an acknowledgment. The fragment now names exactly that one
consumed entry.

---------

Co-authored-by: sim <sim@local>
2026-08-14 23:01:00 -04:00

1.3 KiB

type, pr
type pr
Fixed 3526

/gsd:code-review now derives the phase diff base from GSD's own commit scopes instead of a prose phrase, ending silently wrong review scopes — the diff base fed to the reviewer file-list fallback, the SUMMARY↔diff cross-check union, the reviewer agent's diff_base, and the fallow --changed-since structural pass was greped from commit messages for the literal "Phase N" and kept the oldest match, so any prose mention anywhere in history (a planning commit deferring work "to Phase N per D-09", a doc commit using "### Phase N" as a format example) silently set the base months before the phase existed — on a real repo ~4 phases too early, inflating the reviewer's reading list ~78% with no warning — while GSD's own commits (docs(phase-N):, feat(N-MM):, docs(N):), which never contain the literal phrase, were never matched at all. All three derivations now anchor on the subject-line conventional-commit phase scope (both padded 06 and unpadded 6 spellings, since workflows emit the unpadded roadmap number), commit bodies can no longer capture the base, and a history with no scope-style commits fails loudly with the existing no-base warning and --files escape hatch instead of silently picking an arbitrary commit. (#3503)