Conciseness

Most of the body earns its tokens (IDE path tables, constraint tables, patterns, validation gates), but several sections are padded: the single ~600-word Question Format bullet restates the 'no pointers/labels' rule four-plus ways, and the Priming section opens with narrative ('Derived from debugging a skill whose output kept leaking into a file…'). This fits 'mostly efficient but includes some unnecessary explanation or could be tightened'; it is above a 2 because there is no explanation of concepts Claude already knows, only over-elaborated repo-specific rules.

Actionability

Guidance is fully executable: copy-paste commands ('deno run -A scripts/validate_skill.ts <path/to/skill-directory>', init_skill.ts, package_skill.ts), exact path/constraint tables, a blocking self-review rubric and checklist, and concrete good/bad examples for descriptions and patterns. Per the code_vs_instruction note, this instruction-only skill's concrete specific guidance warrants the top anchor, covering the common authoring cases; minor template snippets (workflow patterns) are explicitly illustrative.

Workflow Clarity

The six-phase creation process (Discovery → Design → Implementation → Verification → Packaging → Iterate) is clearly sequenced, with Phase 4 as an explicit BLOCKING validation gate ('do NOT finish until it exits 0'), a fix-and-re-run feedback loop, and checklists. This matches the anchor for clear sequence with explicit validation steps and feedback loops for error recovery.

Progressive Disclosure

Structure is good: a Design Patterns Reference section clearly signals two one-level-deep references (references/workflows.md, references/output-patterns.md), both of which exist, and the skill teaches its own 500-line/5000-token split discipline. It falls short of a 5 because at ~350 lines the body inlines large material that could be split out (the Control Primitives Map tables and the lengthy Question Format / Priming sections), leaving minor organization gaps relative to the 'content appropriately split' anchor.

Specificity

The description names the domain ('creating agent-invocable Agent Skills (SKILL.md packages auto-discovered by description)') with one concrete action (creating) plus the auto-discovery mechanism, but does not enumerate several specific actions like drafting descriptions, structuring directories, or validating — matching 'names domain and 1-2 concrete actions, but not comprehensive'. It is above a 2 because it is not a bare domain label; it is below a 4 because the capability list stays at a single generic verb.

Completeness

WHAT ('Guide for creating agent-invocable Agent Skills (SKILL.md packages auto-discovered by description)') and WHEN ('Use when users want to create or author a skill, or ask about skill structure or format') are both explicit, with a concrete 'Use when …' trigger phrase. It even adds scope exclusion ('Not for user-invoked slash commands'), matching the anchor for clearly and explicitly answering both what and when.

Trigger Term Quality

Phrases like 'create or author a skill' and 'ask about skill structure or format' are natural terms users would actually say, with the create/author synonym pair and the SKILL.md artifact named. It falls short of a 5 because common variations like 'write a skill', 'skill package', or 'Agent Skills' as a standalone trigger are thin, leaving a few natural terms missing.

Distinctiveness Conflict Risk

The skill-creation niche is distinct, and the explicit exclusion 'Not for user-invoked slash commands' plus 'auto-discovered by description' sharply separates it from command-authoring skills. Conflict risk with similar skills is minimal, matching the clear-niche anchor; a 4 would require some residual overlap that the exclusion clause already closes.