Conciseness

The body is dense with genuinely project-specific rules (no generic concept explanations), but at 241 lines it restates several constraints across sections (brace/NextSegment handling in Ownership and again in Grammar; redirect_uri singular arity in Grammar, "Why One Callback per Statement", and Credentials) and includes rationale prose that could be tightened or moved to references. It sits between anchor 3 (mostly efficient, could be tightened) and anchor 4.

Actionability

The complete copy-paste-ready Caddyfile grammar block enumerates every field with allowed values, plus exact constraints (32–1024 byte secrets, 2048–8192-bit moduli, 1–64 ASCII revisions), named commands (`security oauth rotate secret`), serialization keys, a complete example fixture path, and named tests per behavior. Guidance is fully executable and covers the common cases; anchor 4's 'minor gaps' do not apply.

Workflow Clarity

The credential-change workflow is explicitly sequenced ("First stage any credential change with `security oauth rotate secret`, then select that revision") with fail-closed validation checkpoints (mismatched/corrupt/nonprivate records fail, digest rejects mid-flight changes). Not anchor 5 because the document is primarily a spec — the rotation/validation sequencing is embedded in prose rather than presented as an explicit ordered checklist with retry loops.

Progressive Disclosure

Three of the four reference files (oidc-provider.md, oidc-conformance.md, private-provisioning.md) are well-signaled one-level-deep with content summaries; oidc-conformance-actions.md is only reachable two levels deep via oidc-conformance.md, and dense parser edge-case/test-enumeration detail is inlined in SKILL.md that could live in references. Good structure with minor organization gaps — anchor 4, not 5.

Specificity

"Register named OAuth clients, manage private registration storage, and configure portal OIDC providers" names the domain and three concrete actions. It stops short of anchor 5's comprehensive coverage because adjacent capabilities (secret rotation, callback/PKCE validation) are only implied by the body, not the description.

Completeness

The 'what' is clear (register clients, manage registration storage, configure portal OIDC providers), but there is no 'Use when...' clause or equivalent explicit trigger guidance — the second sentence is a boundary statement, not usage triggers. Per the judging guidelines, a missing explicit trigger clause caps completeness at 3.

Trigger Term Quality

Natural terms a user would say are present: "OAuth", "OIDC", "clients", "providers", "registration", "provisioning". A few natural variants are missing (e.g. "OpenID Connect" spelled out, "client registration"), keeping it below the comprehensive synonym coverage of anchor 5.

Distinctiveness Conflict Risk

"Owns security oauth/oidc provisioning commands; external login providers and security local are separate" explicitly carves the niche and disambiguates adjacent skills. Combined with narrow domain-specific terms, conflict risk is minimal; no neighboring anchor fits better.