Lists multiple specific concrete actions: 'Reads tessl.json, fetches each skill's Snyk security score and findings from the registry, and presents a formatted security report with per-skill risk verdicts, finding categories, and an overall project risk profile with recommendations.'

Clearly answers both what (audit security using Snyk scores, read tessl.json, fetch scores, present formatted report) AND when (explicit 'Use this skill whenever...' clause with multiple trigger scenarios).

Excellent coverage of natural trigger terms users would say: 'audit their skills', 'check skill security', 'security review', 'how safe their installed skills are', 'tessl security report', 'prompt injection risks'. These are varied and natural phrasings.

Highly distinctive with clear niche: specifically targets 'tessl skills', 'Snyk security scores', 'Tessl Registry', and 'tessl.json'. These domain-specific terms make it unlikely to conflict with generic security or audit skills.

The background section explaining Snyk's ToxicSkills research and the eight categories is useful context but somewhat verbose. Claude doesn't need the marketing-style statistics ('36% contained prompt injection techniques') or the full category explanations to execute the audit.

Provides concrete URL patterns for both source types, exact table format to output, specific file paths to read, and clear examples for URL construction. The instructions are copy-paste ready and leave no ambiguity about what to do.

Clear three-step sequence (discover → fetch → report) with explicit handling for edge cases (missing tessl.json, 404 responses). The instruction to gather all data before writing prevents partial reports, and the ordering rules for the table are explicit.

Well-organized with clear section headers. Content is appropriately contained in a single file given the skill's scope. The structure flows logically from background to execution steps to output format.