Lists multiple specific concrete actions: 'Validate input', 'secure auth tokens', and 'prevent injection attacks', all within a named technology (TypeScript).

Clearly answers both 'what' (validate input, secure auth tokens, prevent injection attacks in TypeScript) and 'when' with an explicit 'Use when...' clause listing multiple trigger scenarios.

Includes strong natural keywords users would say: 'validating input', 'auth tokens', 'sanitizing data', 'injection attacks', 'secrets', 'sensitive configuration'. These cover common variations of security-related queries.

Targets a clear niche: security-focused TypeScript tasks including input validation, auth tokens, injection prevention, and secrets management. This is distinct from general TypeScript coding skills or other domain-specific skills.

Mostly efficient but has some redundancy — the reference link appears twice (top and bottom), and some explanations like 'Cross-Site Scripting (XSS)' and 'command injection (OWASP A03)' explain things Claude already knows. The bold formatting is also excessive and adds visual noise.

Provides specific tool/library recommendations and some inline code snippets (e.g., parameterized queries, execFileSync usage), but lacks complete executable examples. Most guidance is directive rather than copy-paste ready — actual code patterns are deferred to the reference file.

The verification step mentioning getDiagnostics is a good checkpoint, but the overall workflow is not clearly sequenced — it reads more like a checklist of concerns than a step-by-step process. For security validation tasks involving multiple steps (validate → sanitize → authenticate), explicit sequencing with validation checkpoints would improve clarity.

Good structure with a concise overview in the main file and clear one-level-deep references to REFERENCE.md for detailed patterns. Sections are well-organized by concern (input validation, injection prevention, authentication, anti-patterns) with clear navigation.