Conciseness

The body is dense with high-signal material (inventory tables, ten concrete test blocks, SQL, a full CI YAML) and avoids explaining generic concepts Claude already knows; minor redundancy between the per-test commentary and the Anti-patterns table and a slightly repetitive References section keep it just short of lean.

Actionability

Fully executable guidance throughout — copy-paste Python tests for every named pattern, SQL 'Postgres-RLS-direct' blocks with concrete SET LOCAL ROLE usage, and a complete GitHub Actions workflow that creates a non-superuser role and runs pytest under it — covering the common cases specifically.

Workflow Clarity

Clear sequenced workflow (Planning -> Step 1 runner/role -> Step 2 battery -> Step 3 CI -> Step 4 diagnose) with explicit validation checkpoints (the 'Expect: rolsuper=f, rolbypassrls=f' and '-- expect 0' assertions) and a Step 4 feedback loop (reproduce, check policy, write minimal regression test before fixing), which satisfies the validation requirement for this DB/CI-gate skill.

Progressive Disclosure

Sectioning is reasonable and the three referenced references/*.md files (isolation-models, attack-patterns, framework-skeletons) exist, but the body repeatedly cites `rls-reference` as a bare non-resolvable name and cites references/other-engines.md which is absent from the bundle, while bundle files models.md and test-surfaces.md are never referenced — broken/orphaned references undermine clear navigation.

Specificity

Lists many concrete actions — 'inventories tenant-bearing surfaces', 'classifies each by isolation model', 'derives the OWASP WSTG-ATHZ-02 coverage matrix', ten named canonical test patterns, and CI integration ('non-superuser non-BYPASSRLS role, fail the build on any leak') — giving comprehensive, non-abstract coverage.

Completeness

Explicitly answers both what ('plans and implements the cross-tenant leak-test suite ... inventories ... classifies ... defines the canonical test patterns ... CI integration') and when ('Use when designing or implementing a tenant-isolation test suite, adding the CI gate to an existing project, or investigating a leak finding') with concrete triggers.

Trigger Term Quality

Natural trigger phrases a user would actually say ('designing or implementing a tenant-isolation test suite', 'adding the CI gate', 'investigating a leak finding') are present, but the set leans technical and omits common synonyms like 'RLS', 'row-level security', or 'multi-tenant isolation'.

Distinctiveness Conflict Risk

Occupies a clear niche (cross-tenant data-leak testing / multi-tenant isolation CI gating) with distinct triggers unlikely to fire for unrelated skills; minimal conflict risk.