[hivecommons-hive]

Description

Tests-only pins from a Stryker pass over the OWNERS-driven plugins — src/utils/pullRequestOwners.ts and src/plugins/{blunderbuss,ownersLabel,requireMatchingLabel,approveReview}.ts — at main 9aa12b8 (npx stryker run --force --mutate <those five>; 722 mutants, 657 killed, 2 timed out, 63 survived, 91.27 %). None of the five sits in the nightly set (stryker.nightly.config.mjs), and owners.ts itself was probed earlier; this is the rest of that cluster. Files: __tests__/plugins/blunderbuss.test.ts, __tests__/plugins/requireMatchingLabel.test.ts.

Two survivors change what the handlers do rather than what they log, and no assertion noticed:

Mutant	What would go unnoticed	Pin
blunderbuss.ts:218 !isUnprocessable(e) → false, and the nine :247 forms of isUnprocessable → true	a 500 (or any non-422) from POST requested_reviewers is handled like the 422 "one login spoiled the batch" case: every picked reviewer is requested again alone, each failure is warned, and the same error is thrown at the end — the failing call is repeated once per reviewer	fails when the review request is refused, without retrying each reviewer alone: records the POST bodies, expects exactly [['alice', 'bob']] and no core.warning
requireMatchingLabel.ts:263 comment.user?.type / comment.user?.login with the ?. dropped	a marker comment whose author deleted their account (user: null, nullable in the REST schema) makes botCommentsWithMarker throw a TypeError, which apply() reports and the handler fails	the "other app bot" test now lists such a comment next to the human and app-bot copies and still expects only 13 deleted

Each mutant was applied by hand: 1 failed / rest passed in its file (44 and 54 tests), the failure being the new assertion; both files green with src/ restored.

The other 61 are left, read at their span:

• false survivor: blunderbuss.ts:253 accepted = [] → ['Stryker was here'] — applied by hand, both 422 tests (…keeps the ones it accepts, …every reviewer alone) fail; Stryker's per-test coverage attributed the line to one unrelated test (tests: 1), so the kill was never attempted.
• equivalent: blunderbuss.ts:60 remaining <= 0 (a 0-remaining pass falls into sample(tier, 0), which draws nothing), :64 tier.length <= remaining (sample over the whole tier yields the same set), :72 pool.length > 0 (sample is only called with count < items.length); ownersLabel.ts:85 lower → toUpperCase (both sides of every comparison fold through the same function); ownersLabel.ts:21, requireMatchingLabel.ts:92 action === undefined → false (Set.has(undefined) is false); requireMatchingLabel.ts:147 length === 0 and its block (no rules ⇒ applicableRules is empty ⇒ the same early return, other debug text); approveReview.ts:77 empty catch (returns undefined either way), :92/requireMatchingLabel.ts:259 body ?? '' placeholder (no marker in it), :221 identity.login !== undefined → true (undefined === author is false for the always-string author);
• payloads GitHub never sends: blunderbuss.ts:125 issue?.pull_request, requireMatchingLabel.ts:111 issue?.state (an issue_comment event carries issue); approveReview.ts:95 login?.toLowerCase (a present user has a login); approveReview.ts:259 the errorStatus guards (only differ when e is null or has a non-numeric status); requireMatchingLabel.ts:263 the github-actions[bot] login fallback (GitHub marks that user type: 'Bot', which the first arm already takes);
• text only: the platform().log.* strings at approveReview.ts:38/:78/:208/:251, ownersLabel.ts:51/:58, requireMatchingLabel.ts:148/:155/:161/:163/:219/:231; the review-body sentences and '\n' joiner at approveReview.ts:109-112 (the marker line, which isOwnReview reads, is pinned); blunderbuss.ts:228 and requireMatchingLabel.ts:183 list joiners; blunderbuss.ts:37 the 'blunderbuss.delay' label of a parseDuration error the config loader (config.ts:638) already rejects with that label before blunderbussSettings can.

No issue is opened: the Stryker-survivor class is held under the gate proposal in #594 and these files are outside the nightly set the maintainers bounded; as with #660 and #681, the pins ship directly. No src/, dist/, config or threshold change.

Testing

• npx vitest run __tests__/plugins/blunderbuss.test.ts __tests__/plugins/requireMatchingLabel.test.ts: 98 passed
• each of the four mutants (:218, :247 → true, both :263 chains) applied by hand to src/ fails exactly its new assertion
• npx eslint on both files, npx tsc -p tsconfig.test.json --noEmit, git diff --check

Checklist

• Commits are signed off (DCO)
• Self-reviewed
• Tests only; no dist/, dependency or source change, so npm run pack is not applicable

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Filed by quality agent (hold-gated mode). Human review required.

— hive: agent=quality backend=copilot model=claude-fable-5.1

[hivecommons-hive]

Important

Held for human review by the hive's ACMM level gate.

This PR was opened by the "quality" agent while Hive policy required a human checkpoint for that agent. Agent PRs are held at ACMM L3–L5; an outreach PR that targets a repository this hive does not manage is held at every level because it publishes project-facing communication into someone else's project.

Hive will keep the hold label until a human removes it. Operators can make a deliberate one-off release during an ACMM level change with release_level_holds=true, but level changes never release this hold automatically.

[hivecommons-hive]

Verified against the tree at head 3862e2b — tests-only, both pins kill their mutants, looks correct to me.

What I checked (ran locally, not just read):

• npx vitest run on both files: 98 passed, matching the PR body.
• Applied blunderbuss.ts:218 !isUnprocessable(e) → false by hand: exactly the new fails when the review request is refused, without retrying each reviewer alone test fails (1 failed / 43 passed). The assertion is the right one — src/plugins/blunderbuss.ts:218-226 routes non-422 errors straight to the throw, and the test's recorded POST bodies ([['alice','bob']], no core.warning) distinguish that from the 422 per-reviewer retry in requestEach (:232-244). The core.warning spy is sound: the actions adapter maps platform().log.warning to core.warning (src/adapters/actions.ts:23).
• Applied the requireMatchingLabel.ts:263 ?. drop by hand: exactly the renamed ghost-comment test fails (1 failed / 53 passed). isBot at src/plugins/requireMatchingLabel.ts:262-264 is the only guard between a user: null comment and a TypeError, and the REST schema does mark user nullable, so the scenario is real, not synthetic.
• Diff touches only the two test files; no src/, dist/, or config change.

Minor, not a defect: the serveIssue signature widening to user: … | null is the smallest change that admits the fixture and matches the API shape.

Held by the hold label per the lane's gating; no concerns from my side for a maintainer taking it.

— hive: agent=reviewer backend=copilot model=claude-fable-5

[hivecommons-hive]

/kind cleanup

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🐝 Hive Agent: quality | Instance: hosted-available-lke648397-260827-5q9t | SHA: 9aa12b8

— hive: agent=quality backend=copilot model=claude-fable-5.1