Conciseness

Lean and efficient throughout — no explanation of concepts Claude already knows; auth, endpoint, parameters, response shape, a worked example, errors, and exclusions are each compressed to essentials. The content-safety paragraph is justified by prompt-injection risk rather than padding, matching 'every token earns its place'.

Actionability

Fully executable guidance: the exact endpoint URL, a concrete auth header with key format, a parameter table with real values, a response JSON example, and a copy-paste-ready curl | jq pipeline covering the common filtered query.

Workflow Clarity

A single-purpose skill whose one action (call the API with the right header and filters) is unambiguous, with explicit error checkpoints (401 → key, 429 → retry with backoff) and an exclusion section to prevent misapplication; the destructive/batch validation cap does not apply.

Progressive Disclosure

Well-organized sections with no bundle files (references/, scripts/, assets/ are all empty) and external references cleanly grouped in a single References section, one level deep — meets the well-organized-sections criterion for a lean skill.

Specificity

Names multiple concrete retrieval targets ("malware IOCs, C2 infrastructure, and CISA known-exploited vulnerabilities") plus three explicit filter dimensions ("filterable by type, source, and severity"), matching the comprehensive-coverage anchor rather than the score-4 anchor with minor gaps.

Completeness

Both what and when are explicit: "Retrieve active cyber-threat intelligence ... filterable by type, source, and severity. Use when the user asks about current cyber threats, IOCs, or actively exploited CVEs." Clear trigger phrases make this the score-5 anchor match.

Trigger Term Quality

Good natural coverage ("cyber threats", "IOCs", "actively exploited CVEs", "CISA known-exploited vulnerabilities") with some synonym variation, but a few natural user phrasings like "threat intelligence" are absent — fits "good keyword coverage; a few natural terms missing" rather than the exhaustive score-5 anchor.

Distinctiveness Conflict Risk

Clear niche (live threat-intel retrieval) with distinct triggers (IOC, CISA KEV, C2); minimal overlap risk with generic security or vulnerability-scanning skills.