Conciseness

Every line is project-specific instruction (the manifest JSON schema with field semantics, exact `just` commands, edge cases like "historical migration entries are expected to retain old names"). No explanations of concepts Claude already knows; nothing could be cut without losing actionable detail. Not 4 because there are no over-explanatory passages to trim.

Actionability

Fully executable throughout: a copy-paste-ready manifest example with a complete field spec, exact commands (`just promote-rules /tmp/biome-rule-promotions.json`, `just gen-rules`, `just gen-configuration`, `just gen-migrate`, `just f`, `just l`, `just lint-rules`), and a concrete inspection step (`git status --short`, `git diff --stat`). The common promotion case is covered end to end.

Workflow Clarity

A clearly sequenced four-phase workflow (Build Manifest → Apply Plan → Generate and Test → Release Entry and Cleanup) with abundant validation checkpoints for this batch operation: "Resolve incomplete or malformed requirements before editing", "The task validates the complete manifest before moving files", "Inspect the move before generation", "Confirm that every requested source file and fixture directory moved", and "Review and accept pending snapshots individually". The destructive/batch cap of 3 does not apply because verification is explicit at every phase.

Progressive Disclosure

No bundle files exist and none are needed at this size: the body is well-sectioned, self-contained, and appropriately delegates detail to explicitly named one-level-deep resources ("Load `testing-codegen` and run the required generators", "Load `changeset` and describe...") rather than inlining them. Navigation via the four section headers is unambiguous.

Specificity

The description lists multiple concrete actions: "promoting one or more Biome lint rules from nursery to stable groups, including promotion plans from GitHub issues, metadata changes, rule renames, generated configuration, and promotion snapshots" — comprehensive coverage of the skill's scope with no vague filler. Not 4 because the enumerated sub-tasks (metadata changes, renames, generated configuration, snapshots) leave no minor coverage gaps.

Completeness

Explicitly answers both questions: the what ("promoting one or more Biome lint rules from nursery to stable groups, including... metadata changes, rule renames, generated configuration, and promotion snapshots") and the when ("Use this skill when promoting..."). Both are concrete, matching the anchor's example structure.

Trigger Term Quality

Natural domain keywords are present ("Biome lint rules", "nursery", "stable groups", "rule renames", "promotion") that a contributor would genuinely say. Not 5 because common variations and synonyms are missing (e.g., "move rule", "graduate rule", or mention of the rules directory/contributor docs); not 3 because the terms are specific and natural rather than generic.

Distinctiveness Conflict Risk

"Promoting Biome lint rules from nursery to stable groups" carves out a clear niche with virtually no overlap risk with other skills — the terms are unique to this exact task. It cannot conflict with generic linting or code-review skills.