Conciseness

The body is dense and almost every section earns its place: classification tables, worked selector-isolation examples, and a bounded report format. Minor repetition could be trimmed — the 'do not execute' prohibition and the SAFE-selector caveat each recur across the Boundary, classification, report, and Anti-Patterns sections — matching the level-4 anchor of minor over-explanation rather than the tighter level-5.

Actionability

Fully executable guidance: exact selector-to-result tables (package@^1.2.0 → MEDIUM, @sha256 digest → SAFE), concrete parsing examples for npx --package, docker run, uvx --from, and pipx --spec, a ready-to-use report table, and a complete input/output example. For an instruction-only skill this is copy-paste-ready guidance covering the common cases.

Workflow Clarity

A clearly sequenced five-step workflow (locate → parse → classify → recommend fix → report) with an explicit uncertainty rule ('If the syntax is ambiguous, return REVIEW rather than guessing') and a bounded report format with closing boundary statements. The read-only nature means the destructive-operation validation cap does not apply, and ambiguity handling serves as the error-recovery loop.

Progressive Disclosure

The single file is well organized into clearly signaled sections (When to Activate, Review Boundary, Classification Rules, Workflow, Example, Anti-Patterns), and the single external link is explicitly optional. However, at ~170 lines with no bundle files, the extended Python/Docker rules and Anti-Patterns could partially live in reference files; this fits the level-4 anchor (good structure, minor organization gaps) rather than a fully split level-5 layout.

Specificity

The description names its domain ('Statically review MCP configuration for mutable package references') and one concrete action plus a no-execution constraint, matching the anchor for domain plus 1-2 concrete actions. It does not list several distinct actions (classify, recommend pins, produce report), so it falls short of level 4, but it is far more concrete than the generic level-2 anchor.

Completeness

It explicitly answers both questions: 'Statically review MCP configuration for mutable package references… without executing discovered MCP servers' states what it does, and 'Use when reviewing .mcp.json, Cursor, VS Code, Claude, Windsurf, or other repo-scoped MCP config' gives concrete when-triggers, matching the level-5 anchor.

Trigger Term Quality

Natural terms are well covered: '.mcp.json', 'Cursor', 'VS Code', 'Claude', 'Windsurf', 'MCP config', 'CI', and 'approval' are phrases users would actually say. It misses a few natural terms the skill itself handles (uvx, pipx, Docker image references, 'version pin'), keeping it below the comprehensive level-5 anchor.

Distinctiveness Conflict Risk

A clear niche (repo-scoped MCP configuration dependency review) with distinct triggers tied to specific MCP config files and tool names. Minimal overlap risk with generic security-review skills since those triggers are specific to MCP configuration review.