Conciseness

The body is dense and expert-level with no basic-concept padding (no 'git is a version control system' filler), and the rationale prose usually changes a decision (e.g. 'a green regression suite is not confirmation the defect is fixed'). Not 5: several motivational/stylistic sentences could be trimmed — 'This is the step teams skip', 'BLOCKED is not a failure of the procedure, it is the correct output', 'Blaming the fix for a deployment gap costs a real reopen cycle' — which restate the governing rule already in the verdict table. Not 3: nothing explained is something Claude already knows at this depth, and every section carries procedural weight.

Actionability

Fully executable guidance throughout: a copy-paste bash block for the ancestry check with a case statement handling all three exit statuses, a numbered priority list for choosing the reproduction, a verdict table specifying exact evidence attachments, and a complete markdown output template with every field named. Not 4: there are no gaps — even the manual tier specifies converting report steps into 'a numbered re-verification script (precondition, steps 1..N, expected result per step)'.

Workflow Clarity

Three explicitly sequenced steps, each with a built-in validation checkpoint and feedback loop: the ancestry-check exit-status table maps every outcome to a verdict consequence, disqualifier checks (flaky tests, never-red reproductions) gate Step 2, and every failure mode routes to BLOCKED with the named action that would clear it. Not 4: validation is explicit and tabulated at every step, not just 'most checkpoints present'.

Progressive Disclosure

The core decision procedure (steps, verdict table, output shape) is appropriately inline at ~200 lines, while the worked example and anti-pattern table are split into a clearly signaled one-level-deep reference that exists in the bundle (references/examples.md) and is linked as '[references/examples.md](references/examples.md)'. Not 4: the split is exactly right — procedural rules in SKILL.md, illustrative material external — with no buried or nested references.

Specificity

The description lists multiple concrete actions: 'proving that a claimed defect fix actually reached the build under test and actually works', 'the merge-base ancestry check', 'the priority order for choosing which reproduction to re-run', and 'the VERIFIED / NOT FIXED / BLOCKED verdict table' — comprehensively covering every phase of the procedure in third person. Not 4: coverage is complete across all three workflow steps, not just 'several specific actions with minor gaps'.

Completeness

Both questions are answered explicitly: 'what' is the full procedure summary (ancestry check, reproduction priority, verdict table) and 'when' is a concrete trigger phrase — 'Use when a developer has marked a defect Fixed and someone must decide whether it moves to Verified or back to Reopened.' Not 4: the 'when' clause is explicit and scenario-specific, not merely present-but-imprecise.

Trigger Term Quality

Good natural keyword coverage: 'defect fix', 'Fixed', 'Verified', 'Reopened', 'reproduction', 're-run', 'confirmation testing' — the closing trigger phrase 'Use when a developer has marked a defect Fixed' mirrors how a user would phrase the request. Not 5: common synonyms users naturally say, such as 'retest'/'retesting' (the ISTQB synonym, which the body mentions but the description omits) and 'bug fix', are missing.

Distinctiveness Conflict Risk

The description actively fences its niche: 'Scoped to ISTQB confirmation testing (does this specific fix work?), not regression testing (did the fix break something else?), and not triage or severity assignment' — explicitly disambiguating the three adjacent skills most likely to collide. Not 4: the overlap risk is not just 'minor' but named and ruled out, giving minimal conflict risk.