Conciseness

Mostly dense and purposeful, but several passages are essayistic or re-explain what the model already knows — e.g. the "_Don't think of an elephant_, and the elephant is all there is" negation mechanics, and "it is the price of human agency; spend it where human judgement matters, remove it where it does not". Not a 4 because these padding passages and the duplicated SKILL-MECHANICS.md pointer (lines 8 and 59) could be tightened; not a 2 because nearly every line introduces a coined, load-bearing concept rather than generic filler.

Actionability

There are concrete tests and examples — "the test: the document should read like documentation written for the agent", "'fast, deterministic, low-overhead' → _tight_", "does it change behaviour versus the default?" — but most of the body defines abstract concepts (information hierarchy, two loads, leading words) rather than giving executable direction for writing or editing a document. Not a 4 because there is no worked procedure or before/after example showing the levers applied; better than a 2 because the embedded tests give specific, usable decision rules.

Workflow Clarity

The document is an all-reference skill (it says so itself: "all reference (a review's rules, this skill)"), so no ordered run of steps is expected, but it contains only fragments of sequence — "Defend in order: sharpen the bound first (local and cheap); only if it is irreducibly fuzzy..." — and no validation checkpoints for the editing work it guides. Not a 4 because applying the rules to an actual document has no prioritized checklist or review loop; above a 2 because the content is coherent and each section carries its own decision rule.

Progressive Disclosure

The body twice points to [`SKILL-MECHANICS.md`](SKILL-MECHANICS.md) for "frontmatter, invocation choice, and router skills", but no such file exists — there are no references/, scripts/, or assets/ directories and no bundle file at all — so the skill's one disclosed reference is dangling and its mechanics content is simply missing. Scored against the actual (empty) bundle structure, the disclosure structure is broken despite the pointer itself being clearly signaled and conditional, which sits at the 2 anchor's level of structural failure rather than the 3 anchor's 'references present but not clearly signaled'.

Specificity

The 'what' is minimal — "Writing documents for agents" — but the trigger clause names concrete artifacts and operations ("creating or editing skills, or modifying AGENTS.md or CLAUDE.md"), matching the anchor 'names domain and 1-2 concrete actions, but not comprehensive'. Not a 2 because the enumerated artifacts (skills, AGENTS.md, CLAUDE.md) go beyond a purely generic domain label; not a 4 because the capability statement itself lists no distinct writing actions.

Completeness

Both parts are present: what ("Writing documents for agents") and an explicit when ("Use when creating or editing skills, or modifying AGENTS.md or CLAUDE.md"). Not a 5 because the 'what' is a single generic phrase that does not enumerate concrete capabilities the way the 5-anchor does; clearly above a 3 since the 'when' is explicit rather than merely implied.

Trigger Term Quality

"creating or editing skills, or modifying AGENTS.md or CLAUDE.md" covers the natural phrases a user would say in this domain. Not a 5 because common variations like "documentation", "system prompt", or "writing a skill" are absent; not a 3 because the included terms are the exact file and artifact names users invoke.

Distinctiveness Conflict Risk

Triggers name specific artifacts (skills, AGENTS.md, CLAUDE.md) that are distinct from most other skills' triggers. Not a 5 because "Writing documents for agents" as a capability statement overlaps with general writing/editing/documentation skills; not a 3 because the named files carve out a recognizable niche.