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reuvenharrison
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May 21, 2026
The free /review URL emitted by every entrypoint used $GITHUB_BASE_REF
(the branch name, e.g. "main") in the base_sha query parameter. That's
mutable: once the base branch advances past the commit the action ran
against — for example, when a downstream PR renames or moves the spec
file on main — every previously-emitted /review URL silently breaks.
raw.githubusercontent.com resolves the branch to whatever the current
HEAD is, not what HEAD was when CI ran. The rev_sha parameter was
always pinned to the immutable head commit, but base_sha wasn't,
leaving the base side of every URL exposed to drift.
Switch all three URL-emitting entrypoints (breaking, changelog,
pr-comment) to a three-tier fallback for base_sha:
1. pull_request.base.sha from $GITHUB_EVENT_PATH (the canonical
value for pull_request triggers)
2. git rev-parse origin/$GITHUB_BASE_REF (works on push triggers
where the base branch was fetched into the workspace)
3. $GITHUB_BASE_REF as the ultimate fallback (today's behavior,
so this is a strict superset of the current contract)
The pr-comment entrypoint already used pattern #1 with #3 as fallback;
this commit adds #2 to its chain so push triggers also get an
immutable SHA whenever possible. breaking and changelog gain the
whole chain.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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