Conciseness

The body is largely lean and assumes competence (repo-specific Postgres-only context, upstream-source grounding, bad/good code pairs), but has minor trimmable redundancy — the "Keep Data in Intermediate Representation" intro sentence is restated almost verbatim in "**The principle**", and "$type<T>() is a compile-time-only type override" re-explains what the cited source already shows. This matches anchor 4 (efficient with minor over-explanation) rather than 5, where every token would earn its place.

Actionability

The $type<T>() and customType sections give executable, copy-paste-ready TypeScript with bad/good pairs and a concrete decision rule ("If `toDriver` and `fromDriver` would be identity functions, use `$type<T>()`"). However, the Schema/Migration and Query Builder rule sections state directives without any code examples (e.g., how to export the schema object or wire drizzle-zod), leaving minor gaps — anchor 4 rather than 5.

Workflow Clarity

Content is organized as rule lists rather than sequenced workflows; the only validation checkpoint is the implicit "Review generated SQL and snapshot changes together". Per the rubric's cap, database/migration operations without an explicit validate-then-fix feedback loop (generate → review snapshot/SQL → fix → regenerate) cannot score above 3, and there is no multi-step sequence that would warrant a higher anchor.

Progressive Disclosure

The single SKILL.md (no bundle files exist in references/, scripts/, or assets/) is well-sectioned with clear headers and one external upstream link, so navigation is easy. It is over 50 lines (~120) and the detailed $type/customType and intermediate-representation sections (~70 lines) could arguably live in a separate reference file, which keeps it at anchor 4 rather than 5.

Specificity

The description lists multiple concrete actions — "Apply Drizzle ORM patterns for schemas, migrations, queries, branded types, and Postgres or D1 boundaries" — covering the domain comprehensively. It matches the anchor for multiple specific concrete actions; a lower score would require dropped capability areas.

Completeness

It explicitly answers both "what" (apply Drizzle ORM patterns for schemas, migrations, queries, branded types, and DB boundaries) and "when" ("Use when working with Drizzle or typed SQL, not raw `bun:sqlite` or non-Drizzle engines"), including negative triggers. This is a clear match for the anchor-5 example structure.

Trigger Term Quality

Natural terms users would say are present ("Drizzle", "typed SQL", "Postgres", "D1", "bun:sqlite"), giving good coverage. It falls short of anchor 5 because common variations like "drizzle-kit", "schema push/generate", or file/config names (e.g., drizzle.config.ts) are missing.

Distinctiveness Conflict Risk

The niche is clearly staked (Drizzle ORM, Postgres/D1) and explicitly disambiguated from adjacent tools ("not raw `bun:sqlite` or non-Drizzle engines"), minimizing wrong-skill triggering. Voice is third person, so no penalty applies.