Conciseness

The body is dense and mostly earns its tokens: it never explains what WCAG or CI is, and the code, baseline JSON, and severity table are all load-bearing. Not 5: there is repetition — the ratchet rationale is stated in the Overview and again in Step 2's framing, the fingerprint semantics are explained in Step 1 and restated in Step 3's prose and in the reference file, and phrases like 'the baseline is shared state - careful coordination prevents bit rot' add little. Not 3: these are minor instances of over-explanation that could be trimmed, not padded sections.

Actionability

A fully executable Python gate script (fingerprint construction, baseline loading, severity tiering, non-zero exit on no-go), a concrete unified-record JSON schema, a baseline file example, a severity-tier decision table, and scanner output shapes plus a ready PR-artifact template in references/gate-implementation.md. Copy-paste ready and covers the common case (axe-core) with an explicit extension path for the other scanners. Not 4: no significant execution details are missing.

Workflow Clarity

Steps 1-5 are clearly sequenced and the gate's no-go/exit-non-zero is itself a validation checkpoint, with a recovery loop in Step 5 item 2 (gate fails -> fix or debate and regenerate baseline). Not 5: checkpoints are implicit rather than explicit in places — no step verifies a regenerated baseline before merging, no dry-run/test of the gate itself, and the destructive 'manually remove the fingerprint' instruction in Step 5 item 3 has no verification that the removal was done correctly. Not 3: sequence and feedback loops are present, so the missing-validation cap does not apply.

Progressive Disclosure

SKILL.md keeps the load-bearing core (unified record, baseline format, gate decision, runnable axe-core script) inline and moves the other four scanners' shapes and the full PR-artifact template to references/gate-implementation.md, which exists and is referenced three times with clear signals ('Per-scanner output shapes and field mappings are in [references/gate-implementation.md]'). The reference is exactly one level deep (verified: it contains no nested references). Not 4: the split is clean with no inlined content that belongs in the reference file.

Specificity

Multiple concrete actions are named: 'Builds a CI gate that fails the build on **new** WCAG / a11y violations', 'grandfathering pre-existing violations on a per-rule / per-page baseline', and 'Aggregates verdicts from axe-core / pa11y / Lighthouse a11y / WAVE / IBM Equal Access scans'. Coverage is comprehensive for the skill's scope, matching the anchor for multiple specific concrete actions. Not 4: unlike the 'minor gaps in coverage' anchor, nothing material about the capability is left unspecified.

Completeness

Explicitly answers both questions: the 'what' is 'Builds a CI gate that fails the build on new WCAG / a11y violations... while grandfathering pre-existing violations' and the 'when' is 'Use when a project has accumulated a11y debt and a strict "zero violations" gate would block every PR'. The trigger condition is concrete and natural, matching the top anchor exactly. Not 4: the 'when' clause is fully explicit rather than merely present.

Trigger Term Quality

Strong natural keywords: 'WCAG', 'a11y', 'violations', 'PR', 'baseline', 'regressions', plus all five scanner names a user would plausibly mention. Not 5: the full word 'accessibility' never appears (only the abbreviation 'a11y' and 'WCAG'), and common phrasings like 'accessibility audit' or 'a11y regression' are not covered, so a few natural synonyms are missing.

Distinctiveness Conflict Risk

A clear niche (a ratchet-style CI gate on a11y violations) with distinct triggers ('accumulated a11y debt', 'zero violations gate would block every PR', scanner names) that no generic scanner-runner skill would claim. Not 4: it does not merely reduce overlap with closely related skills; its trigger conditions are essentially unique to this gate-building purpose. Third-person voice is used throughout ('Builds', 'Aggregates'), so no voice penalty applies.