Conciseness

The body is dense with project-specific contract facts Claude cannot know elsewhere (e.g., 'X-Authcrunch-Refresh: 1', 'sandbox_secret' rotation rules, JWKS mount boundary) and explains no general concepts, but the long prose paragraphs in 'Portal Refresh Transports' and 'Public Signing-Key Discovery' could be tightened into leaner contract statements. This fits 'Efficient; minor instances of over-explanation that could be trimmed' better than the anchor above (5), since some multi-clause sentences carry redundancy ('A 401 denial is a different status, but also does not authorize retry...').

Actionability

Concrete, near-executable guidance throughout: exact endpoints ('POST <base>/api/refresh_token'), exact headers, exact bodies ("{'refresh_token':'<credential>'}", 'POST {}'), status-code semantics (401/403/503/405), and a fully specified login challenge sequence with field names. It falls short of 5 only because no verbatim JSON request/response examples are shown; response shapes are listed as field names rather than copy-paste examples, and some shapes are deferred to references.

Workflow Clarity

The login challenge sequence is a clean numbered 5-step flow with success conditions ('When all checkpoints pass...'), and the Troubleshooting section gives symptom-to-cause-to-fix recovery ('Login sequence fails after password: verify the client preserved the latest sandbox_id...'). Not 5 because the refresh and JWKS flows are prose rather than sequenced steps, so checkpoints across those flows are implicit rather than explicit.

Progressive Disclosure

All 8 references/*.md files referenced in the body exist and are clearly signaled with a consistent 'For X, read [Y]' pattern, one level deep, organized under topic sections. It misses 5 because substantial inline contract detail (the ~60-line 'Portal Refresh Transports' section, ~50-line 'Public Signing-Key Discovery') remains in SKILL.md where a reference split, like the login section's use of native-client.md, would apply.

Specificity

It names several concrete capabilities — 'Build or troubleshoot portal JSON/native login clients, refresh, Documents, profile and admin APIs, and public JWKS' — covering nearly every body section. Not 5 because coverage is compressed ('refresh' alone is terse) and omits capability areas present in the body such as the /whoami and /beacon status/identity endpoints; clearly above 3, which expects only 1-2 concrete actions.

Completeness

Both parts are present: 'Build or troubleshoot portal JSON/native login clients...' answers what, and 'Use for HTTP contracts' explicitly answers when, further sharpened by the boundary clause 'portal Caddyfile wiring belongs to configuration-authentication'. Not 5 because the when-clause is terse and abstract — it lacks concrete user-mentionable trigger phrases like 'when building or debugging portal login, refresh, or JWKS clients' — so 'when could be more explicit or specific' is the closest anchor.

Trigger Term Quality

Good natural keyword coverage for this domain: 'login', 'refresh', 'Documents', 'profile', 'admin APIs', 'public JWKS', plus the trigger phrase 'HTTP contracts'. A few natural terms users would mention are missing ('token refresh', 'session', 'whoami', 'beacon'), so it fits 'good keyword coverage; a few natural terms missing' rather than the comprehensive-synonyms anchor at 5.

Distinctiveness Conflict Risk

Clear niche with distinct triggers ('portal', 'JSON/native login clients', 'public JWKS') and an explicit de-confliction sentence routing Caddyfile wiring to the sibling skill: 'portal Caddyfile wiring belongs to configuration-authentication'. This is exactly the minimal-conflict pattern of the 5 anchor; nothing pushes toward 4.