Names the domain (writing conventions for skills/prompts) and mentions some actions (creating, reviewing), but doesn't list specific concrete actions like 'format headers', 'structure frontmatter', or 'optimize token usage'.

Clearly answers both what ('Writing conventions for scannable, token-efficient skills and prompts') and when ('Use when creating or reviewing SKILL.md files, AGENTS.md files, or any markdown-based agent instruction documents').

Includes natural keywords users would say: 'SKILL.md', 'AGENTS.md', 'markdown-based', 'agent instruction documents', 'prompts'. These are specific file types and terms users would naturally mention.

Has a clear niche focused specifically on SKILL.md and AGENTS.md files with distinct triggers. Unlikely to conflict with general writing or documentation skills due to the specific file type mentions.

The skill is lean and token-efficient, using telegraphic style throughout. It practices what it preaches—no unnecessary explanations of concepts Claude would know, every section earns its place.

Provides concrete, copy-paste ready examples throughout. Before/after comparisons are executable markdown, formatting patterns show exact syntax, and the RFC 2119 keywords section gives specific usage examples.

While the document structure is clear and sequential, it lacks explicit validation checkpoints or feedback loops. The reference to 'assets/checklist.md' for validation is mentioned but not integrated into a clear workflow sequence.

Well-organized with clear h2/h3 hierarchy, appropriate content density per section, and a single external reference (assets/checklist.md) that's clearly signaled. Content is appropriately scoped for a style guide.