Conciseness

Every line is a rule, a limit, or a command ('Frontmatter: name, description...', 'Stay under 100 lines', 'npm run skills:gen'), with zero concept explanations or padding. This matches the lean-and-efficient anchor; level 4 would require at least minor over-explanation to trim, which is absent.

Actionability

Guidance is mostly executable: concrete frontmatter fields, a required body order, hard limits, and runnable commands ('Edit the source, then run npm run skills:gen'). It stops short of level 5 because it never shows a worked example of a well-formed SKILL.md even though it mandates 'Quick start (one concrete example)' for the skills it governs.

Workflow Clarity

The generated-facts flow is clearly sequenced with a validation backstop ('Edit the source, then run npm run skills:gen. CI runs npm run skills:check and fails on drift') and a closing Checklist acts as verification. It misses level 5 because the primary writing/updating task itself has no numbered workflow or decision gates of the kind the skill prescribes for others.

Progressive Disclosure

The body is under 50 lines, well-organized into clear sections, and needs no external references; mentioned files (REFERENCE.md, EXAMPLES.md, TROUBLESHOOTING.md) are one level deep and clearly signaled. Per the simple-skill scoring note, this merits a 5 on organization alone.

Specificity

The description names the domain ('agentmemory skill') and the actions 'writing or updating' but does not enumerate what the format/rules cover (frontmatter, body order, line limits). This matches the anchor for naming a domain with 1-2 concrete actions, not the level above, which requires several specific actions.

Completeness

It explicitly answers both parts: the 'what' ('The house format and rules for writing or updating an agentmemory skill') and a concrete 'Use when' clause listing three trigger phrases. This matches the anchor requiring both what and when with concrete triggers; level 4's example has a noticeably weaker 'when'.

Trigger Term Quality

'Use when adding a new skill, restructuring an existing one, or reviewing a skill contribution for consistency' provides natural phrases users would say in this workflow. It misses common variations like 'updating', 'editing', or 'SKILL.md', so it falls short of comprehensive synonym coverage.

Distinctiveness Conflict Risk

The description is scoped to a clear niche (house format for agentmemory skills) with distinct triggers (adding, restructuring, reviewing a skill contribution), minimizing overlap with other skills. Level 4 would require notable overlap with closely related skills, which is not evident here.