The body is mostly lean and assumes Claude's competence, but it duplicates content already present in the bundle files — notably the Step 4.1 severity-threshold table (fully covered in references/severity-thresholds.md) and the file-type table (in references/supported-languages.md) — so not every token earns its place.

It provides concrete, executable guidance: specific git diff commands, named MCP tools with their parameters (path, severity_threshold, all_projects), hunk-parsing filter logic for @@ -X,Y +A,B @@ ranges, and a copy-ready report template.

The process is clearly sequenced across Phases 1–5 with numbered steps, validation checkpoints in the filter-to-new-issues and block-decision phases, and explicit retry/feedback loops in the error-handling table.

Bundle files exist in references/ (severity-thresholds.md, supported-languages.md) but the body never signals or links to them, and their content is inlined rather than split out — fitting the anchor for references present but not clearly signaled with content that should be separate kept inline.

The description names multiple concrete actions — 'detects changes, runs appropriate scans (SAST, SCA, IaC), filters to only NEW issues, and prevents vulnerabilities at the source' — matching the anchor for listing several specific actions.

It states both what the skill does (proactive scanning, change detection, filtering to new issues) and when to use it via an explicit 'Use this skill when:' list with multiple triggers.

It includes natural phrases users would say such as "scan for security issues", "check my changes", "secure at inception", "proactive scan", and "security check", giving good coverage of likely utterances.

It carves a clear niche — Snyk-backed proactive security scanning of newly generated/modified code — with distinct triggers unlikely to fire for unrelated skills, though 'check my changes' is mildly generic.