Conciseness

The body is lean and imperative throughout — 'npm run db:generate', 'A service reads and writes only its own tables' — with zero padding and no explanation of concepts Claude already knows. All the terminology it does explain (decks, doors, zines) is project-specific and earns its tokens.

Actionability

Mostly executable: real commands ('npm run db:generate', 'npm run db:migrate'), a complete service.ts example, and a folder-layout spec. Not 5 because the test snippet is a comment sketch ('// push your schema, seed, call your service functions, assert.') and cli.ts/server.ts wiring is described but never shown, leaving minor gaps.

Workflow Clarity

A clear 8-step sequence with a genuine validation checkpoint (step 7: drive service.ts against PGlite and assert), covering the database-operation feedback-loop concern. Not 5 because there are no error-recovery loops (e.g., what to do when a migration fails or a test breaks), and not below 4 since the checkpoints that matter are present.

Progressive Disclosure

Well-organized sections with clear, one-level-deep, well-signaled pointers ('src/hull/health/', 'src/zine.md', 'drizzle.config.ts', the author-zine skill). Not 5: at ~87 lines it exceeds the under-50-line simple-skill exception, and some content (e.g., the full testing pattern or door-wiring details) could live in a reference file, so placement is good rather than optimal.

Specificity

The description lists several concrete coverage areas — 'Covers the folder shape, which deck it belongs in, wiring it to a view, testing it, and when to give it a zine' — five distinct, specific aspects. Not 3 (it lists far more than 1-2 actions) and not 5 (the 'what' leans on project jargon like 'the native unit of data + logic + doors' rather than fully concrete actions).

Completeness

Both are present: an explicit trigger ('Use when adding a new Skylark service') and a clear 'what' (folder shape, deck choice, view wiring, testing, zine). Not 5 because the anchor-5 examples include multiple concrete trigger phrases ('or when the user mentions PDFs, forms...'), whereas here the 'when' rests on a single trigger with no variations.

Trigger Term Quality

'adding a new Skylark service' is a natural phrase a user in this repo would say, but coverage stops there — common variations like 'create', 'scaffold', or 'build a service' are absent. Matches anchor 3 ('some relevant keywords but missing common variations or synonyms') more than anchor 4, which expects good broader coverage.

Distinctiveness Conflict Risk

'Skylark service' is a clear niche term with a distinct trigger; virtually no other skill would fire on 'adding a new Skylark service'. The only adjacent skill mentioned ('author-zine') lives in the body, not the description, so overlap risk in the trigger surface is minimal.