The description names the domain (cached plugin versions, disk space) and one action (clean up), but doesn't list multiple specific concrete actions like listing cache contents, showing cache size, selecting specific versions to remove, etc.

Clearly answers both 'what' (clean up old cached plugin versions to free disk space) and 'when' (explicit 'Use when' clause with multiple trigger phrases covering various ways a user might request this).

Excellent coverage of natural trigger terms including 'clean cache', 'cleanup plugins', 'prune old versions', 'free disk space', 'plugin cache', 'clear old plugins', and 'plugin cache size' — these are phrases users would naturally say.

Very specific niche — plugin cache cleanup is a distinct task unlikely to conflict with other skills. The trigger terms are narrowly scoped to plugin caching and version pruning.

Every sentence serves a purpose. No unnecessary explanations of what caching is or how plugins work. The brief context line about Claude Code keeping every version is the minimum needed to justify the skill's existence.

Provides exact executable commands with proper variable references (`${CLAUDE_SKILL_DIR}`), specific flags (`--dry-run`, `--delete`), and clear tool usage (`AskUserQuestion`). Copy-paste ready.

Clear 5-step sequence with an explicit dry-run validation step before any destructive action, a confirmation gate using a specific tool, and an early-exit condition (cache already clean). This is a textbook feedback loop for a destructive operation.

For a simple, single-purpose skill under 50 lines, the content is well-organized with a clear header and numbered workflow. No external references are needed, and the structure is clean and easy to navigate.