Conciseness

The body is lean and assumes Claude's competence: no basic OAuth/Caddyfile concept explanations, and nearly every sentence carries non-obvious, code-backed facts (per-driver scope defaults, logout_url alias rejection, retry-interval fallback behavior). Not 4 because no section contains trimmable over-explanation; every token earns its place for a skilled operator.

Actionability

Fully executable guidance throughout: copy-paste-ready Caddyfile blocks (full provider definitions, shortcut form, portal enablement, transform matching), the exact supported-driver list, per-driver required fields, the id-token-cookie grammar with defaults ("AUTHP_ID_TOKEN"), and concrete fixture paths. Not 4 because the examples cover the common cases end-to-end with no gaps.

Workflow Clarity

The Shape example, per-driver requirements, and the ten-item Review Checklist give clear validation checkpoints, but the procedure for adding a provider (write block → add driver-required fields → enable in portal → validate against checklist) is implicit across sections rather than an explicitly ordered sequence. Not 5 because no ordered steps or error-recovery loop are laid out; not 3 because the checklist provides explicit checkpoints and the operation is not destructive/batch.

Progressive Disclosure

Two one-level-deep references (shared-parser.md, shared-login-storage.md) are present in the bundle, each well-signaled with a when-to-read purpose statement, keeping grammar inventory and storage detail out of the overview. Not 5 because reference-grade detail such as per-driver scope defaults and Provider-Side Claim Notes remains inline in SKILL.md, which could be split into a provider-notes reference.

Specificity

The description lists many concrete configurable items — "login providers, credentials, scopes, issuer/audience trust, JWKS, PKCE, portal enablement, and named pending-login storage" — but all hang off a single generic verb ("Configure"), and driver-specific setup or troubleshooting coverage is absent. Not 5 because the actions are one verb over many objects rather than multiple distinct concrete actions; not 3 because coverage of the domain's capabilities is broad and specific.

Completeness

The "what" is clear and concrete (configure OAuth/OIDC providers, trust, storage), but there is no "Use when..." clause or equivalent explicit trigger guidance; the second sentence ("Named relying-party registrations and portal OPs belong to OAuth applications") is a routing boundary, not a when-to-use trigger. Per the judging guidelines, a missing explicit trigger clause caps completeness at 3.

Trigger Term Quality

Good natural keywords users would say: "OAuth", "OIDC", "login providers", "credentials", "scopes", "portal". Missing common variations like "identity provider", "social login", or "sign in with Google/GitHub", which keeps it below anchor 5; above anchor 3 because the included terms are the primary natural phrasings for this task.

Distinctiveness Conflict Risk

The niche is clear and specific (external OAuth/OIDC provider configuration for this app), and the closing sentence explicitly routes adjacent concepts ("Named relying-party registrations and portal OPs belong to OAuth applications") away from confusion with sibling skills, minimizing conflict risk.