Conciseness

The body is lean and directive with no explanations of concepts Claude already knows, but it contains minor trimmable duplication — 'Read `docs/adr/INDEX.md` first' in Ground Rules is restated as audit step 1, and the propose-only rule appears in both Ground Rules and Applying Fixes. This fits 'efficient; minor instances that could be trimmed' rather than the fully lean level-5 anchor.

Actionability

As an instruction-only skill, guidance is fully concrete: specific file paths (docs/adr/INDEX.md, docs/fdr/, AGENTS.md), an 8-point per-ADR checklist, eight named finding categories, a copy-paste markdown report template, and numbered fix steps with verification commands. Nothing is vague or pseudocode-like, so it exceeds the level-4 anchor.

Workflow Clarity

Both workflows are clearly sequenced (audit steps 1–7, fix steps 1–6) with explicit checkpoints: a user-approval gate before any edits, a cross-reference sweep, and targeted verification ('markdown link checks or focused grep checks'), plus a per-ADR checklist. Edits are validated, so the batch/destructive cap does not apply.

Progressive Disclosure

No bundle files exist and the 117-line body is well organized into clearly headed sections with no nested references, but everything is inlined in a single file — the detailed Evidence Sources list and What To Check checklist could live in reference files to keep SKILL.md a leaner overview. Good structure with minor organization gaps fits level 4, and the under-50-line exception for scoring 5 does not apply.

Specificity

The description enumerates six concrete review dimensions — 'implementation drift, contradictions, stale decisions, missing supersession notes, weak rationale, and missing cross-references' — giving comprehensive, specific coverage of what the skill does; there are no gaps that would place it at level 4.

Completeness

It explicitly answers both 'what' (a full review of all ADRs for six named issue types) and 'when' (a 'Use when...' clause with concrete trigger phrases), matching the level-5 anchor structure; level 4 would require the 'when' to be less explicit, which it is not.

Trigger Term Quality

'Use when the user asks for an ADR review, ADR audit, stale ADR check, architecture decision consistency check, or wants to verify ADRs against the current codebase' covers the natural phrasings users would say, including synonyms (review/audit/check/verify) and adjacent artifacts (glossary, public API state). No common user phrasing is missing, so it exceeds level 4.

Distinctiveness Conflict Risk

The niche is clear (review/audit of ADRs only, with distinct trigger phrasing), but the skill coexists with a closely related `adr` authoring skill (referenced in the body for update/supersede workflows), creating minor overlap risk for ambiguous 'verify/update ADR' requests — fitting the level-4 anchor 'mostly distinct; minor overlap risk' better than level 5.