Conciseness

The body is lean — one-line tool bullets ('Fast, template-based CVE/misconfiguration scanning'), guardrail rules ('Never run DAST tools against live production environments'), a scoring table, and anti-patterns, with no explanations of concepts Claude already knows. It is not 5 because of small redundancies: the link to references/implementation.md is repeated three times ('See [implementation guide](references/implementation.md)' twice plus the References section), and the 'Priority: P1 (HIGH)' heading adds little.

Actionability

The body gives concrete direction (specific tools, probe targets like '/metrics, /health, .git, /.env, /api-docs', headers like 'X-Forwarded-For'), but contains no executable commands itself — every command is deferred via 'See [implementation guide](references/implementation.md) for all commands', and tool bullets only describe rather than instruct. This matches the anchor 'Some concrete guidance but incomplete... missing key details' rather than 4, because a reader of the body alone could not execute a scan without opening the reference.

Workflow Clarity

The content is organized by tool category rather than as a sequenced process — there is no 'select target → run scan → triage findings → score' workflow and no validation checkpoints (e.g., verify the target is staging before scanning). The Always-Apply rules ('No Scanning Production... Use local or staging replicas only', 'Always set max-depth or max-duration') act as guardrails, which keeps this above 2, but DAST is a risky batch operation and the rubric caps workflow clarity at 3 without explicit validation steps, which is the binding constraint here.

Progressive Disclosure

The body is a well-organized overview (rules, tool catalog by platform, scoring table, anti-patterns) and all executable commands are appropriately split into references/implementation.md, which exists (verified in the bundle) and is referenced one level deep with clear signaling in three places. This matches the anchor 'Clear overview with well-signaled one-level-deep references; content appropriately split'.

Specificity

The description names multiple concrete capabilities across three named domains — 'backend APIs, frontend web apps, and mobile clients' — and enumerates specific tooling ('ZAP, Nuclei, Nikto, sqlmap, ffuf, browser automation, mobile proxy interception, and AI-driven curl probes'). This matches the anchor 'Lists multiple specific concrete actions; comprehensive coverage'; it is not score 4 because coverage of the domains and tools is comprehensive rather than having minor gaps.

Completeness

It explicitly answers what ('Standardize dynamic application security testing... Covers ZAP, Nuclei...') and when ('Use when advising on or running dynamic security scans on local/staging environments') with concrete trigger phrases. This is a clear match for the anchor 'Clearly and explicitly answers both what AND when'; not 4, because the 'when' clause is explicit and specific rather than generic.

Trigger Term Quality

Natural terms like 'dynamic security scans', 'security testing', and tool names (ZAP, sqlmap, ffuf) are present and would be said by users needing this skill. It falls short of 5 because common synonyms such as 'DAST' (the acronym users actually type), 'pentest', 'penetration testing', and 'vulnerability scan' are absent from the description itself (they only appear in the metadata triggers).

Distinctiveness Conflict Risk

The niche is clear — dynamic (not static) security scanning with named tools — and the 'Use when' clause scopes it to advising/running scans on local/staging environments, giving minimal conflict risk with other security or browser-automation skills. Not 4, because the dynamic-vs-static framing and specific tool names leave virtually no overlap ambiguity.