The body is lean and assumes Claude's competence: a signature, a parameters table, a return value, and two short examples, with no padded explanation of what Excel or Markdown is — every token earns its place.

Provides two complete, copy-paste-ready executable Python examples plus a parameter table with types, required flags, and defaults, giving fully executable guidance.

This is a simple single-action skill whose call is unambiguous from the signature and examples; per the simple-skills note, the clear single action scores 3 without needing a multi-step workflow or validation checkpoints.

Under 50 lines with no external references needed and well-organized sections (功能, 调用方式, 参数说明, 返回值, 使用示例), so the simple-skill allowance lets it score 3.

States the domain and a single concrete action ('将 Excel 文件转换为 Markdown 格式的文档') but does not enumerate multiple specific actions like sheet selection or formatting options, matching the 'Names domain and some actions, but not comprehensive' anchor rather than the multi-action level 3.

Explicitly answers both 'what' (converts Excel files to Markdown documents) and 'when' ('当用户提到...时使用'), matching the level-3 anchor requiring explicit triggers.

Provides natural phrases a user would actually say ('Excel 转 Markdown、表格转 MD、Excel 文档化'), giving good coverage of common variations rather than technical jargon.

The Excel-to-Markdown niche with distinct triggers is clearly distinguishable and unlikely to fire for unrelated skills.