Conciseness

The ~90-line body is lean with no padding: no known-concept teaching appears (e.g., 'Use the role as the policy gate and identity as the row predicate' is dense platform-specific guidance, not PG basics), and code snippets are minimal but complete. Every section — workflow, routing, self-check — earns its tokens.

Actionability

Guidance is executable throughout: a copy-paste-ready RLS policy ('CREATE POLICY orders_select_own ON public.orders FOR SELECT TO authenticated USING...'), a concrete TS batching snippet using .in('id', userIds), and a specific inspection call 'queryEnv(action="info", envId=...)'. The routing table maps each branch to an exact file.

Workflow Clarity

Four numbered steps each end with an explicit '**Complete when:**' validation checkpoint, and a 'Minimum self-check' checklist closes the process, matching the anchor for clear sequence plus explicit validation and checklists. Validation is present for the migration/DDL path, so the destructive/batch cap does not apply.

Progressive Disclosure

The routing table ('Repeated calls, serial queries, polling... → references/access-patterns.md') is well-signaled and all four referenced files exist at appropriate sizes (58–104 lines), with 'Load only the references required by the current branch.' However, references/schema-and-rls.md and references/capacity-and-connections.md chain on to sibling-skill references (e.g., '../postgresql-development-cloudbase/references/auth-and-rls.md'), a second hop that keeps this short of fully one-level-deep.

Specificity

The description lists five concrete actions — 'designing how tables are read and written, eliminating per-row database calls, adding indexes for filters or joins, reviewing high-traffic data access, or explaining a slow SQL query' — within a named domain (CloudBase PostgreSQL). Coverage is comprehensive rather than having the minor gaps of the 4 anchor.

Completeness

Both what ('CloudBase PostgreSQL access-pattern and slow-query quality guidance') and when are explicitly answered: an explicit 'Use when...' clause enumerates five concrete triggers, and a negative boundary ('Not for first-time PG SDK setup, login UI, or NoSQL collections') further delimits usage, matching the anchor for concrete trigger phrases on both questions.

Trigger Term Quality

Natural trigger phrases are present and specific — 'slow SQL query', 'adding indexes for filters or joins', 'per-row database calls', 'high-traffic data access' — but common user phrasings like 'query optimization', 'N+1 queries', or 'database performance' are missing, matching the good-but-incomplete keyword coverage anchor.

Distinctiveness Conflict Risk

'CloudBase PostgreSQL' carves a clear niche, and the explicit exclusions ('Not for first-time PG SDK setup, login UI, or NoSQL collections') steer away from the sibling development, auth, and document-database skills, giving minimal conflict risk.