Conciseness

The body is dense and assumes Claude's competence throughout — no padding or explanations of known concepts — though a few abstract policy sentences ('Keep recognized-but-restricted forms visible with their validation status') could be tightened. Not 5 because the Syntax Currency and Acceptance criteria sections carry some prose that reads more like governance than directly usable instruction.

Actionability

The Common Shape section provides a complete, copy-paste-ready Caddyfile covering the common case (local identity store, portal crypto, policy, and route wiring), plus optional matcher forms, concrete parser filenames (caddyfile.go, plugin_authn.go), and exact fixture paths. Not below 5: no pseudocode or fragments are presented as runnable examples — fragments are explicitly labeled with their enclosing scope.

Workflow Clarity

The Workflow section gives a clear 5-step sequence with a validation checkpoint (step 5: check generated syntax against local wrappers, upstream grammar, validators, and fixtures). Not 5 because there is no in-body feedback loop for what to do when that check fails — error recovery is delegated to the linked testing contract skill; not 3 because the validation checkpoint itself is explicit.

Progressive Disclosure

A well-executed router pattern: the body stays an overview, three reference files (syntax-maintenance.md, authcrunch-compatibility.md, operator-examples.md) exist in the bundle, are one level deep, and each is signaled with an explicit when-to-use condition. The Domain Map appropriately routes to sibling domain skills rather than inlining their grammar, keeping navigation easy.

Specificity

'Build or review caddy-security Caddyfiles and select focused configuration skills' names the domain plus several concrete actions (build, review, select, 'authenticate/authorize route wiring'). Not 5 because coverage stops short of naming the other major configuration surfaces (identity stores, crypto, OAuth/SAML providers) that the body actually routes.

Completeness

Both parts are explicit: the 'what' ('Build or review caddy-security Caddyfiles') and an equivalent 'Use for...' trigger clause naming two wiring scenarios. Not 5 because the when-clause is terse relative to the anchor's concrete multi-phrase triggers and omits the review/audit contexts the body clearly supports.

Trigger Term Quality

'caddy-security Caddyfiles', 'security app declarations', and 'authenticate/authorize route wiring' are natural terms a Caddy user would say. Not 5 because common synonyms users would actually invoke — OAuth/OIDC, SAML, SSO, identity provider, secrets — are absent.

Distinctiveness Conflict Risk

'caddy-security Caddyfiles' is a clear niche with distinct, plugin-specific triggers; virtually no overlap risk with generic configuration skills. Neighboring anchor 4 ('minor overlap risk') fits less well since no other skill would claim these triggers.