Conciseness

There is no padding prose or explanation of concepts Claude already knows, but the same routing information is repeated four times: the Quick Reference table, the dot digraph, the numbered Decision Tree, and the Example Invocations section all map the identical symptom→file pairs. Anchor 3 ("mostly efficient but could be tightened") fits — the dot graph and Examples sections are pure duplication of the table; not anchor 2 since everything present is functional routing content, not fluffy explanation.

Actionability

Concrete and executable for a router skill: the Example Invocations map exact user requests to specific files, the Quick Reference maps symptoms to files, and Conflict Resolution gives specific error-message heuristics ("CODESIGN, ITMS-90xxx, errSec → security"). Not a 5 because of minor gaps: the CLI commands are only named ("security find-identity, security cms -D") rather than shown, and routing conventions are inconsistent ("/skill axiom-shipping" vs "See axiom-build" vs "axiom-payments suite").

Workflow Clarity

The routing decision process is unambiguous and reinforced from multiple angles (table, tree, conflict resolution, examples), covering fallbacks like signing-error ownership and the automated-scanner delegation. Not a 5 because no fallback is specified for tasks that match no branch, and mixed invocation styles ("/skill X", "See X", "X (Agent)") leave minor ambiguity about how to actually invoke the external suites and subagent.

Progressive Disclosure

The body is exactly the anchor-5 pattern — a concise overview with well-signaled, one-level-deep references ("See skills/keychain.md", each with a stated purpose in the Quick Reference and Critical Patterns). It drops to 4 because the referenced files could not be verified: the bundle contains only SKILL.md (no references/, scripts/, or skills/ directories), and many pointers route laterally to other suites (axiom-vision, axiom-payments, axiom-build), which is appropriate for a router but leaves navigation partially unverifiable from this bundle.

Specificity

Phrases like "storing credentials securely", "implementing passkeys", "securing AI/agentic features against prompt injection", and "managing certificates and provisioning profiles" name several concrete tasks across the domain. Not a 5 because every phrase is trigger language — the description never states what the skill actually does (provide reference guides and routing), leaving minor gaps in coverage.

Completeness

The description is entirely a "Use when..." clause; the 'when' is explicit and rich, but the 'what' is only implied by the enumerated tasks with no statement of the skill's action (e.g., "Provides reference guides and routing for..."). It sits above anchor 2 ("Use when working with documents" — vague when, no what) because the triggers concretely convey the domain, but below anchor 4 because the 'what' is never explicitly stated.

Trigger Term Quality

Natural user terms are well covered: "storing credentials", "encrypting data", "passkeys", "prompt injection", "code signing", "certificates", "provisioning profiles" — phrases users would plausibly say. Not a 5 because common synonyms like keychain, crypto/secrets, App Attest, and entitlements are missing, which would catch more variations.

Distinctiveness Conflict Risk

Triggers like "prompt injection", "provisioning profiles", and "passkeys" occupy a clear niche with minimal generic overlap. Not a 5 because the broad scope (encryption, data at rest, network-adjacent security) creates minor overlap risk with sibling skills (data persistence, networking, shipping) that the description gives no boundary guidance for.