Names the domain (workflow and skill files) and a general action (writing concise, token-efficient files, preventing over-building), but doesn't list multiple specific concrete actions like 'enforce line limits, remove redundant sections, validate frontmatter'.

Clearly answers both 'what' (rules for writing concise, token-efficient workflow and skill files; prevents over-building) and 'when' (Use when creating or editing workflow files, SKILL.md files, or new skill definitions) with an explicit 'Use when' clause.

Includes relevant terms like 'workflow files', 'SKILL.md files', 'skill definitions', but misses common variations users might say such as 'skill template', 'skill authoring', '.md skill', 'token budget', or 'skill optimization'.

Fairly specific to skill/workflow file authoring, but could overlap with general writing style guides, documentation skills, or markdown editing skills. The mention of 'token-efficient' and 'SKILL.md' helps but 'workflow files' is somewhat broad.

The skill practices what it preaches — it's lean, uses bullet points and tables instead of prose, and every line adds value. No unnecessary explanations of concepts Claude already knows.

The rules are concrete and specific (e.g., size limits, anti-patterns with before/after examples), but some guidance is slightly vague — 'Merge sequential steps' and the self-check items could be more precise. The anti-patterns section shows what to delete but doesn't always show the correct replacement.

For a single-purpose instructional skill, the workflow is clear: core rules → size limits → required structure → anti-patterns → self-check. The self-check checklist at the end serves as a validation checkpoint before saving, which is appropriate for this type of skill.

The skill references extracting content to `references/` multiple times in the size limits table, but no bundle files or reference documents are provided. The content itself is well-organized with clear sections, but the referenced paths don't resolve to anything.