Conciseness

The ~12-line body is lean and every line earns its place — purpose, the cache-indirection instruction, direct-invocation behavior, and a one-line workflow pointer — with no explanation of concepts Claude already knows; matches the 'lean and efficient, every token earns its place' anchor.

Actionability

Gives concrete, copy-paste-ready file paths ('${CLAUDE_PLUGIN_ROOT}/.../references/step-0-fast-path.md' and '.../ensure-config.md') and a precise procedure ('follow its instructions (Layers 1–3, then Layer 4 cache write)'); as an instruction-only skill the absence of inline code is not penalized because the guidance is actionable.

Workflow Clarity

Clearly sequences both invocation paths (entry-point → step-0-fast-path cache check → fallthrough vs. direct → full validation) and explicitly names the cache-check validation gate with its hit/miss branching, meeting the 'clear sequence with explicit validation steps' anchor at the overview level.

Progressive Disclosure

The body is a clean overview pointing one level deep to real, well-signaled references (step-0-fast-path.md, ensure-config.md, cache-check.sh) with content appropriately split; the referenced files contain the actual instructions rather than further redirects.

Specificity

Names the domain and a single action — 'verify that Arness Code configuration is present for the current project' — but does not enumerate multiple concrete actions, matching the 'names domain and some actions, but not comprehensive' anchor; not a 1 (not vague) and not a 3 (no list of several specific actions).

Completeness

Explicitly states what ('verify that Arness Code configuration is present') and when via an explicit 'should be used when the user says...' trigger clause, satisfying both what-and-when with explicit triggers; the missing-'Use when' cap does not apply.

Trigger Term Quality

Lists multiple natural trigger phrases a user would say — 'ensure config', 'check arness config', 'verify arness setup' — giving good coverage; the 'arn-code-ensure-config' slug is technical but the natural terms dominate, clearing the 'good coverage' anchor over the 'some keywords, missing variations' level.

Distinctiveness Conflict Risk

Targets a clear niche (Arness Code config verification) with distinctive 'arness'-prefixed triggers, making conflict with unrelated skills unlikely; matches the 'clear niche with distinct triggers' anchor.