Conciseness

The body is dense with non-obvious domain facts (default cookie names, redirect statuses, rejected settings) and never explains concepts Claude already knows like JWT or OAuth. It falls short of level 5 because the redirect-URL preservation and path-decoding sections run long and discursive where a tighter statement or a pointer to the owning tests would do.

Actionability

Copy-paste-ready caddyfile blocks cover policy shape, ACL shortcuts and explicit rules, set-options, bypass rules, inject headers, and Basic/API-key wiring, plus concrete curl commands with real headers. Defaults and rejected inputs are enumerated specifically, matching the fully-executable anchor with common cases covered.

Workflow Clarity

Content flows from a minimal working shape through defaults, ACL grammar, policy options, and auth modes to test fixtures, and the Acceptance criteria section provides explicit validation checkpoints ('Verify response behavior and downstream call counts, not just returned errors'). It is not a 5 because guidance is organized by topic rather than as a sequenced configure-then-validate procedure with explicit feedback loops.

Progressive Disclosure

All five references/ files exist and each is well-signaled with a purpose statement and explicit ownership ('That reference owns private offline issuance and revocation'), one level deep. It is not a 5 because the ~430-line body inlines multi-paragraph deep-dives (path-encoding rules, redirect URL preservation) that are handled at the same depth of detail as content split into the reference files.

Specificity

The description lists ten-plus concrete configuration targets ("authorization policies, ACLs, static claims enrichment, required external decisions, bypasses, identity headers, JWT verification, remote Basic/API-key auth, SQLite API keys, and direct OAuth") covering every major section of the skill. This matches the anchor for multiple specific concrete actions with comprehensive coverage, exceeding the level-4 anchor's 'minor gaps in coverage'.

Completeness

The 'what' is clear and detailed, but there is no 'Use when...' clause or any equivalent explicit trigger guidance, which caps completeness at 3 per the judging guidelines. It is not a 2 because the 'what' is concrete and comprehensive rather than vague.

Trigger Term Quality

Keywords like "authorization policies", "ACLs", "JWT verification", "Basic/API-key auth", and "OAuth" are natural terms for users of this configuration domain, giving good coverage. It falls short of level 5 because no synonyms or variations are included (e.g. 'access control', 'authz').

Distinctiveness Conflict Risk

Distinctive items like "static claims enrichment", "SQLite API keys", and "direct OAuth without a portal" carve a clear niche, but "JWT verification" overlaps a sibling crypto-configuration skill and the authorization/authentication boundary is close to other portal skills, matching the 'mostly distinct; minor overlap risk with closely related skills' anchor.