Conciseness

The body is lean and assumes Claude's competence — it supplies only project-specific conventions (wiki frontmatter fields, plist rules, severity examples) rather than concepts Claude already knows. Minor trimmable redundancy: PASS/WARN/FAIL semantics are defined in Step 3 and repeated almost verbatim in the Severity Guide table, keeping it just below the lean anchor 5.

Actionability

Fully actionable for an instruction-only skill: a concrete parseable input block format, an explicit four-part check taxonomy with concrete failure examples ('Placeholder text left in place', 'Label matches filename'), a copy-ready report template, and deterministic verdict rules. No vague direction remains.

Workflow Clarity

The five-step protocol is clearly sequenced with explicit validation checkpoints (existence, completeness, correctness, convention checks), a feedback rule for underspecified goals (flag as WARN rather than guessing), deterministic overall-verdict rules, and error recovery (on FAIL, offer to fix). This matches the anchor-5 pattern of sequence plus explicit validation and feedback loops.

Progressive Disclosure

A single well-sectioned file with clear headers and no external references, which is appropriate for a subagent prompt of this size. It falls just short of anchor 5 because the artifact-specific convention checklists (wiki frontmatter fields, shell script rules, plist rules) are borderline reference material that could be split into a separate file if the skill grows, and the two-mode setup plus conventions give it slightly more inlined content than a minimal overview.

Specificity

Names the domain ('implementation validation') and two concrete actions ('check whether an implementation matches its stated goal', 'return PASS/WARN/FAIL with actionable issues'), but coverage is not comprehensive — it never says what kinds of artifacts (files, code, documents) it checks. Fits anchor 3 (1-2 concrete actions, not comprehensive) better than anchor 4, which expects several specific actions with only minor gaps.

Completeness

Explicitly answers both: what ('Independently check whether an implementation matches its stated goal and return PASS/WARN/FAIL with actionable issues') and when ('Use for second-opinion validation of an implementation or generated output'). This mirrors the anchor-5 good example pattern of concrete capability statement followed by an explicit 'Use when/for' trigger clause.

Trigger Term Quality

Contains several natural keywords a user would say — 'check', 'validation', 'second-opinion', 'implementation', 'generated output' — giving good trigger coverage. Not a 5 because common synonyms like 'review', 'verify', or 'audit my work' are missing.

Distinctiveness Conflict Risk

Has a clear niche (second-opinion implementation validation) with distinct trigger phrasing, minimizing conflict with extraction or authoring skills. Not a 5 because it could mildly overlap with closely related review/QA skills given generic terms like 'check' and 'implementation'.