Conciseness

The body assumes Claude's competence — no preamble on what Biome or a changeset is — and every section delivers actionable guidance with no padded explanation, fitting the 'lean and efficient' anchor.

Actionability

Provides a concrete command ('just new-changeset-empty'), copy-paste changeset format blocks, and specific per-change-type writing examples, making guidance fully executable.

Workflow Clarity

Single-task skill with an unambiguous create→edit→choose-type→format sequence plus explicit guardrails ('Do not simply append... which creates an invalid changeset'; header levels 'break the CHANGELOG tooling'), satisfying the simple-skill allowance.

Progressive Disclosure

No bundle files exist; the skill is self-contained with well-organized sections and clearly-signaled external references (CONTRIBUTING.md, versioning page, changesets docs), so well-organized sections suffice.

Specificity

Lists multiple concrete actions — 'creating and writing proper changesets' plus an enumerated set of change types (bug fixes, new features, rule changes, formatter changes, parser changes) — matching the 'lists multiple specific concrete actions' anchor.

Completeness

Clearly states both what (creating/writing changesets for the CHANGELOG) and when (two explicit trigger clauses), satisfying the 'clearly answers both what AND when' anchor.

Trigger Term Quality

'Use when a PR introduces user-visible changes' and 'Trigger when creating changesets, writing changeset descriptions, or choosing the correct change type' give good coverage of natural terms a contributor would actually say.

Distinctiveness Conflict Risk

Scoped to 'Biome PRs' with changeset-specific triggers, giving it a clear niche unlikely to fire for unrelated skills.