Conciseness

The classification tables and runner-parsing rules are dense and earn their tokens, but the same boundary statements repeat three to four times (the no-execution rule at lines 11/27/95, the SAFE caveat at lines 61/118, mutable-≠-breach at lines 31/117/150, and the scope boundary at lines 23/81/158-162). This is 'some unnecessary explanation or could be tightened' (anchor 3) rather than the 'minor instances' required for anchor 4.

Actionability

Fully actionable for an instruction-only skill: a concrete config path list, exhaustive selector-classification tables, worked parsing examples for each runner ("npx --package ecc-universal ecc", "docker run --rm -i example/server:1.2.3 serve", "uvx --from example-tool==1.2.3 example-command"), a fixed six-column report format, and a complete input-to-output example. These are copy-paste-ready decision rules covering the common cases, matching anchor 5.

Workflow Clarity

Five clearly sequenced steps with per-step guardrails, an explicit ambiguity fallback ("If the syntax is ambiguous, return REVIEW rather than guessing"), unknown-version handling ("If the reviewed version is unknown, say so"), a never-omit-completeness rule, and a closing boundary checklist for the report. This is a read-only review with no destructive or batch operations, so the validation cap does not apply, and the edge-case feedback paths satisfy anchor 5 better than anchor 4's 'minor validation gaps'.

Progressive Disclosure

Well-organized sections with clear headers, easy navigation, and no buried or nested references (the skill has no bundle files, and the only pointers are clearly signaled cross-skill names and one optional external link). Not 5 because everything is inline in a ~170-line file: the runner-specific parsing details and the extended Docker/Python tables sit at a detail level that could be split into a one-level-deep reference file, leaving SKILL.md as an overview.

Specificity

"Statically review MCP configuration for mutable package references" names the domain and one concrete action with method/timing modifiers, but does not enumerate the fuller capability set (classification levels, bounded report, pin recommendations). This matches anchor 3 (domain plus 1-2 concrete actions, not comprehensive); anchor 4 requires several distinct specific actions, which the single 'review' verb does not provide.

Completeness

Explicit what ("Statically review MCP configuration for mutable package references") plus an explicit when-equivalent ("before approval or CI"), clearing the cap of 3 for missing trigger guidance. Not 5 because the when clause covers only approval/CI timing and omits other concrete triggers, e.g. a config using @latest or reviewing .mcp.json changes.

Trigger Term Quality

Good natural keyword coverage: "MCP configuration", "package references", "approval", "CI", "MCP servers" — comparable to the anchor-4 example. Not 5 because common user phrasings and extensions are missing (".mcp.json", "npx", "@latest", "pin", "dependencies"); above 3 because coverage is good rather than merely 'some relevant keywords'.

Distinctiveness Conflict Risk

Clear niche (static MCP-config dependency-drift review) with distinct triggers; "MCP configuration for mutable package references" is unlikely to fire for generic code-review or security skills. Fits anchor 5 (clear niche, minimal conflict) better than anchor 4, whose 'minor overlap with closely related skills' is not present in the description text itself.