The body is lean and assumes competence — it gives the command, sample targets, a short workflow, and an output sample without explaining what Markdown or headings are, so every token earns its place.

It provides a copy-paste-ready command 'python3 {baseDir}/scripts/extract_toc.py /path/to/file.md', concrete target examples, specific follow-up commands ('sed -n', 'nl -ba'), and a sample output block, matching fully executable guidance.

The five-step Workflow is clearly sequenced and, because the operation is read-only inspection rather than destructive/batch work, the absence of an explicit validation checkpoint is not penalized per the simple-skill guidance.

At under 50 lines with well-organized sections and a single one-level-deep reference to a real bundled file ({baseDir}/scripts/extract_toc.py, confirmed present), it matches the anchor for clear overview with well-signaled references.

Quotes one concrete core action — 'Extract a Markdown heading tree with line numbers' — but the rest ('editing or integrating notes', 'choose the best insertion point') frames use cases rather than listing multiple distinct capabilities, so it sits at 'names domain and some actions' rather than 'lists multiple specific concrete actions'.

It explicitly answers what ('Extract a Markdown heading tree with line numbers') and when via an explicit 'Use when you need to inspect a long Markdown file quickly...' clause, matching the top anchor.

Natural terms a user editing notes would actually say appear throughout: 'Markdown file', 'notes', 'editing', 'inspect', matching the anchor for good coverage of natural terms.

The TOC-with-line-numbers niche and 'before editing' trigger are specific enough to avoid firing for unrelated skills, matching 'clear niche with distinct triggers'.