Conciseness

Dense, unpadded policy prose with no explanation of concepts Claude already knows (no 'what Markdown is', no general review theory). Every sentence carries a decision rule, e.g. 'A guard or answer stated elsewhere in the same document, or in a file it points to, counts.' Not 4: there is no over-explanation that could be trimmed without losing a real rule.

Actionability

Concrete method: 'Read the AGENTS.md or CLAUDE.md chain governing the changed files, from the repository root down', 'Trace each concrete thing the changed text names against the repository', 'follow it as the agent would, in order ... and note the first point where it would act wrongly'. Reporting prescribes an exact output format ('Name the file and quote the statement, then what is true or what a reader does instead'). Per the scoring notes, absence of code in an instruction-only skill is not penalized when guidance is this specific.

Workflow Clarity

Sections Scope → Method → Threshold → Reporting form a coherent sequence, and the method's implicit order (read standing rules → trace each name → simulate following the instruction) is discernible. Not 5: the steps are prose rather than an explicitly ordered list and no validation checkpoint is spelled out beyond the review itself. Not 3: the sequence is clear, the report format is defined, and as a read-only review lens it involves no destructive or batch operations requiring feedback loops.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent) and none are needed: the ~60-line body is fully self-contained, organized into well-labeled sections (Scope, Method, Threshold, Reporting), and contains no external references at all. Per the guidelines, a compact skill with no need for external references scores 5 on well-organized sections alone. Not 4: no content here belongs in a separate file.

Specificity

Quotes: 'for whether it is true of the repository, whether an agent or reader following it acts correctly, and whether it meets the repository's own rules for that content' — three concrete review actions, plus explicitly named targets ('standalone skills, AGENTS.md and CLAUDE.md, READMEs, and documentation') and an explicit exclusion. This is multiple specific concrete actions with comprehensive coverage for its scope; not 4, which requires minor gaps — none are present.

Completeness

The 'what' is fully explicit (truth, followability, repository rules), and 'Use as one lens in a code review run' is an explicit when-clause, so this is above 3. Not 5: the when states the mode of use rather than a concrete trigger condition (e.g., when a code review includes changes to .md files), so it could be more explicit.

Trigger Term Quality

Natural terms a user would say: 'Markdown', 'AGENTS.md and CLAUDE.md', 'READMEs', 'documentation', 'code review'. Includes filenames and domain synonyms covering the full space of markdown-content review requests. Not 4: no commonly used term for this domain is missing.

Distinctiveness Conflict Risk

'a change to Markdown that is not part of an agent plugin' explicitly carves out the neighboring plugin lens, and the niche (non-plugin Markdown content review) is distinct from general code review skills. Clear niche with deliberate conflict avoidance; minimal overlap risk.