Lean and efficient throughout: the runtime-GC analogy is a one-line frame, not padding, and no section explains concepts Claude already knows; every section (channels table, workflow, commands, anti-patterns) earns its tokens.

Provides fully executable bash/jq commands — the orphaned-hook grep loop, the duplicate-permission jq pipeline, and the soft-delete/log snippets are copy-paste ready, with a deliberate macOS/BSD portability note ('du -k instead of GNU-only find -printf').

The six-step workflow (Scan, Rank, Confirm, Soft-delete, Log, Report) is explicitly sequenced with a human-in-the-loop checkpoint ('[y/n/skip]' per item) and anti-patterns (bulk approval, hard-deleting on first pass) that function as validation guardrails for destructive/batch operations.

Self-contained SKILL.md with no bundle files and no nested references; content is organized into well-signaled sections (channels table, workflow, example commands, anti-patterns, related skills) that stay one level deep, satisfying the simple-skill bar for organized single-file skills.

Lists multiple concrete actions — 'Periodically scans ~/.claude (skills, memory, hooks, permissions, MCP servers, caches) for redundant, stale, orphaned, or low-value items, then walks the user through a confirm-each-deletion cleanup' — naming both the targets and the action sequence.

Clearly answers both what (scan and confirm-each-deletion cleanup) and when via the explicit 'Use when the user says...' clause, satisfying the full what-and-when bar.

Quotes natural phrases a user would actually say — "clean up my config", "config GC", "too many skills", "audit my setup", "my .claude is bloated" — giving strong coverage of realistic trigger language.

The config-GC niche and its specific quoted triggers ('config GC', 'my .claude is bloated') are clearly distinguishable from general cleanup skills and unlikely to fire for the wrong skill.