Conciseness

The ~28-line body is lean and fully operational — the one-line context note ("Claude Code keeps every version it has ever downloaded — this skill prunes all but the latest version of each plugin") is necessary framing, and every other line instructs rather than explains. Anchor 5 fits: nothing to trim; not 4 because there are no instances of over-explanation.

Actionability

Both script invocations are copy-paste ready with concrete flags ("node \"${CLAUDE_SKILL_DIR}/../../scripts/cleanup.js\" --dry-run" and "--delete"), the confirmation step names the exact tool (AskUserQuestion), and the two commands cover the common cases. Anchor 5 fits; not 4 because no key execution details are missing for the intended flow.

Workflow Clarity

This destructive operation has an explicit validation checkpoint (mandatory dry-run before any deletion), an early-exit feedback path ("If no old versions are found, tell the user the cache is already clean and stop"), and a hard confirmation gate ("Do NOT delete without explicit confirmation"), satisfying the destructive-operation requirement and matching the anchor-5 pattern. Not 4 because the validation and feedback steps are explicit rather than merely present.

Progressive Disclosure

The short, well-sectioned body delegates its logic to a single clearly signaled script reference, but that script is not present in the provided bundle (no scripts/ directory exists) and its path ("${CLAUDE_SKILL_DIR}/../../scripts/cleanup.js") resolves outside the skill directory, leaving navigation unverified. Anchor 4 fits; not 5 because the referenced bundle file cannot be verified in the actual bundle structure, and not 3 because the body itself is appropriately organized with a one-level-deep, clearly signaled reference.

Specificity

The description names the domain and one core concrete action — "Clean up old cached plugin versions to free disk space" — but lists only that single action rather than several specific actions, matching the anchor for 1-2 concrete actions without comprehensive coverage.

Completeness

It explicitly answers both "what" ("Clean up old cached plugin versions to free disk space") and "when" ("Use when the user says..." with concrete trigger phrases), directly matching the anchor-5 example pattern.

Trigger Term Quality

It quotes seven natural user phrases with good synonym variation ("clean cache", "cleanup plugins", "prune old versions", "free disk space", "plugin cache", "clear old plugins", "asks about plugin cache size"), providing comprehensive coverage of what a user would actually say.

Distinctiveness Conflict Risk

The plugin-cache niche and plugin-specific triggers ("cleanup plugins", "plugin cache", "clear old plugins") are distinct, but the broader triggers "free disk space" and "clean cache" could overlap with general disk- or cache-cleanup skills, giving minor rather than minimal conflict risk.