Conciseness

The body is rule-dense and assumes Claude's competence (no basic-concept explanations), but has minor over-explanation that could be trimmed: the em-dash section restates the ASCII rule ('This line restates it because they slip in through copy-paste'), the 1024-char limit appears in both 'Token economy' and 'Canonical guidelines' (with an explicit cross-reference), the upstream best-practices link appears twice, and the 'Do not refactor pre-emptively' paragraph restates the preceding bullet. This fits anchor 4 ('efficient; minor instances of over-explanation that could be trimmed') rather than 3 because each restatement is deliberate and explicitly justified in the text, and rather than 5 because the duplication is real token cost.

Actionability

Concrete, executable rules throughout: 'Wrap markdown at **100 characters**', 'Only `name` and `description` fields', 'Use the YAML folded block scalar (`>-`)' with a yaml example, 'confirm it is under 1024', 'leave its file untouched' for vendored `humanizer`, and a validation procedure naming a fresh subagent on `opus` prompted with a trigger phrase. This fits anchor 4 ('mostly executable guidance... with minor gaps'); it is not 5 because some actions lack an executable method — 'measure it before saving: count the length of the single string YAML produces' gives no command (e.g., a one-liner) to actually measure, and the trigger-coverage test offers no concrete procedure.

Workflow Clarity

The editorial workflows carry explicit checkpoints and feedback loops: the after-edit checklist ('Add triggers... Remove triggers... Tighten triggers... State explicitly that no change is needed'), the save gate ('A description that reaches 1024 chars is a broken skill. Do not save it; summarize or cut triggers until it fits'), and validation ('prompt a Coding Agent... with a trigger phrase, and confirm the skill loads'). This is anchor 4 ('clear sequence with most checkpoints present; minor validation gaps'); it is not 5 because the document is a distributed conventions reference rather than one coherent end-to-end sequence, and the non-editorial sections (markdown style, frontmatter, vendored skills) are rules without sequence.

Progressive Disclosure

The body (~173 lines) is well under the ~500-line ceiling, self-contained with clear section headers, and explicitly encodes the split policy ('Push to `references/<topic>.md`: Setup, install, troubleshooting...'). No bundle files exist (no `references/`, `scripts/`, or `assets/`), so scoring follows the body's own structure: anchor 4 ('good structure; most content is appropriately placed; minor organization gaps'). It is not 5 because the 'Canonical guidelines (Anthropic)' section re-summarizes upstream material that could itself live in a reference file, and not 3 because nothing large is wrongly inlined and navigation by section is easy.

Specificity

The WHAT sentence names the domain ('Editing conventions for files under `.claude/skills/**`') and lists four concrete coverage areas ('markdown style, frontmatter format, SKILL.md vs `references/` split, upstream-vendored skills'). This matches the anchor 'lists several specific actions; minor gaps' rather than 3 (only 1-2 concrete actions) and falls short of 5 because the items are topic areas rather than fully enumerated actions (e.g., 'validating a skill change' from the body is not surfaced).

Completeness

It explicitly answers both parts: WHAT ('Editing conventions for files under `.claude/skills/**` (markdown style, frontmatter format, ...)') and WHEN with a concrete 'Use when...' trigger list. This matches the 5 anchor ('clearly and explicitly answers both what AND when with concrete trigger phrases'); it cannot be 4 because the 'when' is explicit, multi-trigger, and specific, not merely 'could be more explicit'.

Trigger Term Quality

Triggers are natural user phrasings with file extensions: 'creating a new skill, editing any `SKILL.md` or `references/*.md` file, refactoring a skill description, or after adding/removing a skill'. Good coverage but a few natural variations are missing (e.g., 'write', 'update', or 'review a skill'), so it fits anchor 4 ('good keyword coverage; a few natural terms missing') rather than 5's 'comprehensive coverage... including synonyms'.

Distinctiveness Conflict Risk

The niche is clear and narrow (maintenance of `.claude/skills/**` files) with distinct file-pattern triggers (`SKILL.md`, `references/*.md`, 'adding/removing a skill') that no generic markdown or editing skill would claim. This matches the 5 anchor ('clear niche with distinct triggers; minimal conflict risk') and is above 4 because overlap risk with other skills is negligible, not just minor.