Conciseness

The 23-line body is lean and assumes Claude's competence: it contains zero concept explanation, no padding, and every line either routes to a reference file or states a real constraint ('To replace an existing diagram image with Mermaid, use the `docs-diagrams` skill'). It is not 4 because there is no over-explanation anywhere to trim; it is not below 5 because brevity never costs clarity.

Actionability

The routing guidance is concrete and executable — it gives an exact decision rule ('Choose the page guide: `references/DOC.md`: Pages under `/docs`') and names the cross-reference for diagram replacement. It is not 5 because the body itself contains no inline example, command, or snippet for the most common case; a first task still requires opening a reference file before any concrete step is known. It is above 3 because the guidance given is fully specified, not pseudocode or vague direction.

Workflow Clarity

The sequence is clear — follow the most specific AGENTS.md, load global rules, then choose the page guide by route, with 'editing, moves, deletions, redirects, and verification' delegated to `references/AUTHORING_WORKFLOW.md`. It is not 5 because no inline validation checkpoint or feedback loop (validate-then-fix) is stated in the body itself; verification is only reachable via the reference's one-word listing. It is not capped at 3 because verification is explicitly signaled as part of the authoring workflow's scope rather than entirely absent, and it is not 3 because the routing sequence itself has no gaps.

Progressive Disclosure

The body is a clean overview with well-signaled, one-level-deep references — each of the 8 referenced files exists in `references/`, every pointer is annotated with its scope, and no detail content is inlined that belongs in a separate file. It is not 4 because navigation is unambiguous (numbered list plus a conditional 'choose the page guide' branch) and there is no nested-reference indirection anywhere in the bundle.

Specificity

The description lists multiple concrete actions — 'creating, editing, moving, deleting, or reviewing' — and enumerates the objects they apply to ('Mastra documentation, sidebars, redirects, or docs components'), giving comprehensive coverage of the skill's operations. It is not below 5 because nothing in the anchor's bar for 'multiple specific concrete actions' is missing; it is not describable as 4 because there is no noticeable gap in action coverage.

Completeness

It explicitly answers both parts: 'what' ('Documentation guidelines for Mastra') and 'when' ('Use this skill when creating, editing, moving, deleting, or reviewing Mastra documentation, sidebars, redirects, or docs components'). The trigger clause enumerates concrete triggering activities, matching the anchor-5 example pattern. It is not 4 because the 'when' is fully explicit rather than 'could be more specific'.

Trigger Term Quality

Good keyword coverage with natural terms users would say — 'Mastra', 'documentation', 'docs components', 'sidebars', 'redirects' — but a few natural variations are missing (e.g. 'docs site', 'MDX', 'llms-txt', 'docs navigation'). It exceeds 3 because several relevant, naturally-spoken terms are present; it falls short of 5 because synonyms and related extensions users might mention are absent.

Distinctiveness Conflict Risk

'Mastra' is a clearly-scoped niche with distinct triggers (Mastra docs, sidebars, redirects, docs components), so conflict risk with other skills is minimal. It is not below 5 because no overlap with generic documentation or writing skills is implied — the domain qualifier gates every trigger.