Conciseness

The body is ~35 lines of dense, imperative policy with zero background explanation — 'Choose the narrowest validation target', 'Reject pipe-to-shell install instructions', 'Never discover targets with an `ads-*` glob'. Every sentence carries novel instruction and assumes Claude's competence, matching the 'lean and efficient; every token earns its place' anchor. It is not level 4 because there is no over-explanation to trim.

Actionability

The guidance names concrete criteria (SHA-256 checksums verified against a trusted release channel, exact ownership-manifest paths, `ads-*` glob prohibition), but gives no executable commands or entry points — 'use the deterministic core validator' and 'dispatch a fresh-context release verifier' are never tied to a script path, command, or interface. This sits between the 'minimal concrete guidance' anchor (2) and the 'concrete code or commands with minor gaps' anchor (4): the details of what to check are concrete, but how to execute any step is missing.

Workflow Clarity

The destructive path has explicit validation gates and error-recovery feedback ('Validate the entire manifest and configured root boundaries before any deletion', 'If the manifest is absent, invalid, mismatched, or unsafe, stop before deleting anything and require manual review'), and the output contract ('Return machine-readable pass/fail results, the highest-priority blocker, exact evidence, and recovery steps') defines a clear sequence. It is not level 5 because the main validation flow (choose target → run checks → report) is a categorized rule list rather than an explicitly sequenced workflow with per-target checkpoints, and the general run/repo/release paths lack their own failure-recovery loops.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/ directories), and the body is under 50 lines with a single coherent purpose and well-organized sections, which per the rubric's simple-skill guidance earns a 5. All content is appropriately inline at this size; there are no buried or nested references, so it does not fall to level 4's 'minor organization gaps'.

Specificity

The description enumerates concrete validation targets — 'Validate Claude Ads contracts, scoring inputs, run bundles, capabilities, source freshness, safety, installation, uninstall, or release readiness' — covering the domain comprehensively rather than gesturing vaguely. It clearly matches the 'multiple specific concrete actions; comprehensive coverage' anchor and exceeds the level-4 anchor, which expects minor coverage gaps.

Completeness

It explicitly answers 'what' ('Validate Claude Ads contracts, scoring inputs, run bundles, capabilities...') and 'when' ('Use for ads validate, ads status, ads next...') with concrete trigger phrases. This matches the level-5 anchor exactly; it is not level 4 because the 'when' clause is not merely present but enumerates specific invocation scenarios.

Trigger Term Quality

Phrases like 'ads validate', 'ads status', 'ads next', 'maturity checks', 'checksum verification', 'preflight', 'QA', and 'release audits' give good natural keyword coverage that a user of this toolchain would plausibly say. It falls short of the level-5 anchor (comprehensive synonyms/extensions), because several triggers are internal jargon ('ownership-manifest uninstall', 'stale claims with missing tool access') rather than user-natural phrasings.

Distinctiveness Conflict Risk

The 'Claude Ads' niche with triggers like 'ads validate', 'ads status', and 'ownership-manifest uninstall' creates a clear, distinct trigger surface with minimal overlap against generic validation or QA skills. Not level 4 because no closely related skill in this set would plausibly compete for these triggers.