Mostly efficient and avoids explaining concepts Claude already knows, but the NoSQL-vs-PG comparison table is duplicated (lines ~50 and ~198, the latter mixing in untranslated Chinese) and the 'Golden rule' restates prior guidance, so it could be tightened; not the lean level-3 anchor and not the padded level-1 anchor.

Provides copy-paste-ready TS/SQL code, specific MCP action signatures with parameters, exact base URLs, and concrete error codes with fixes — fully executable guidance matching the level-3 anchor.

The 'Required Flow' is a clear numbered sequence with explicit validation checkpoints (verify migration history, verify RLS via real session, verify both layers before done) and feedback loops, matching the level-3 anchor and exceeding the checkpoint-missing level-2 anchor.

SKILL.md is an overview with well-signaled one-level-deep references into references/, all referenced files exist, and a 'Reference index' enumerates them; matches the clear-overview level-3 anchor.

Lists multiple concrete actions and named APIs (schema setup, queryPgDatabase/managePgDatabase, JS SDK v3 app.rdb() CRUD/RPC, PG HTTP API fallback, RLS, username-password auth, CMS/admin CRUD) — matches the 'lists multiple specific concrete actions' anchor.

Opens with an explicit 'Use when building, debugging, or evaluating ...' trigger clause and details what the skill does, clearly answering both what and when; the level-2 anchor lacks an explicit when, which this is not.

Covers natural terms a user would say ('CloudBase PostgreSQL', 'CloudBase PG', 'PG mode', 'Postgres') plus trigger method names like app.rdb(); matches the good-coverage anchor and is not the level below, which only has some relevant keywords.

The niche is sharply scoped to CloudBase PG / PG mode with distinct trigger terms, making it unlikely to fire for NoSQL or MySQL skills; not the level-2 anchor, which could still overlap with similar skills.