Conciseness

The body is dense and actionable with no padded sections, but two spots explain concepts Claude already knows: 'A realm holds users, credentials, roles and groups; a client is an application that asks Keycloak to authenticate users' and the code comment 'the context manager starts and stops the container'. These are exactly anchor 4's 'minor instances of over-explanation that could be trimmed' rather than anchor 5's 'every token earns its place', though they are far below anchor 3's broader inefficiency.

Actionability

The body provides copy-paste-ready artifacts: the session-scoped KeycloakContainer fixture, the jq realm-sanitisation command, the realm-check fixture asserting against the discovery document, a complete client-credentials test, and CI YAML; both referenced recipe files contain fully executable test functions for PKCE, token exchange, UMA, introspection, and admin API. This matches the 5 anchor (fully executable, specific examples cover the common cases).

Workflow Clarity

Eight clearly sequenced steps include an explicit validation checkpoint ('Before any flow test, assert the started server serves the imported realm') with a feedback loop for error recovery ('If it fails: check the container log for the import line... Fix the fixture, not the paths'), plus a pre-commit grep check for leaked secrets in Step 2. This matches the 5 anchor's explicit validation steps and error-recovery guidance, not 4's 'minor validation gaps'.

Progressive Disclosure

The core workflow (container, fixture, discovery check, basic grants, CI) stays in SKILL.md while flow-level detail is split into references/endpoint-recipes.md and references/flow-recipes.md — both real files, one level deep, each clearly signaled at the step where it is needed ('Each of these has a recipe in references/flow-recipes.md'). Structure matches the 5 anchor (clear overview, well-signaled one-level-deep references, appropriate split).

Specificity

The description enumerates concrete capabilities: 'a throwaway Keycloak per test class via Testcontainers, realm JSON imports, OIDC discovery, token and introspection endpoints, the admin REST API, password, auth-code, client-credentials and token-exchange flows, and UMA'. This covers every major capability of the skill's eight steps with no material gaps, matching the 5 anchor (multiple specific concrete actions, comprehensive coverage) rather than 4's 'minor gaps in coverage'.

Completeness

'Use whenever an app uses self-hosted Keycloak and needs integration tests' is an explicit when-clause with a concrete trigger, and the colon-separated list comprehensively answers what the skill does. This clearly matches the 5 anchor (both what AND when with concrete trigger phrases), not 4 where the 'when' could be more explicit.

Trigger Term Quality

'Keycloak', 'self-hosted Keycloak', 'integration tests', 'Testcontainers', 'OIDC', and 'token exchange' are terms a user would naturally say when needing this skill, giving good keyword coverage. However, common variations such as 'identity provider', 'SSO', or 'login' are absent, so it falls between the 4 anchor ('a few natural terms missing') and the 5 anchor's comprehensive synonym coverage.

Distinctiveness Conflict Risk

'self-hosted Keycloak' names a specific identity provider deployment, giving a clear niche with distinct triggers that would not fire for sibling skills like auth0-tests or okta-tests or for generic OAuth work. This matches the 5 anchor (clear niche, minimal conflict risk).