Conciseness

The body is dense and assumes Claude's competence (channels table, executable commands, no basic concept explanations), but the human-in-the-loop rule is stated three times (Design Philosophy #4/#5, Workflow step 3, Anti-Patterns 'Bulk approval') and the Related Skills section adds marginal tokens. Not 3: padding is minor, not pervasive; not 5: some repetition and the Related Skills list could be trimmed.

Actionability

Copy-paste-ready executable bash covering the common cases: orphaned-hook detection loop, duplicate/shadowed permission detection with jq, du -k cache sizing, soft-delete with undo logging, and backup-then-remove of a permission entry via jq. Not 4: the commands are complete and directly runnable, with the macOS/BSD portability choice even justified inline.

Workflow Clarity

The six-step workflow (Scan, Rank, Confirm one-by-one, Soft-delete, Log, Report) has an explicit validation checkpoint (per-candidate '[y/n/skip]' with the user able to stop) and undo paths (`.disabled`, `_gc_trash/<date>/`, `.bak`), so the destructive-operation cap of 3 does not apply. Not 3: validation is present; not 5: the jq permission-removal example lacks a post-edit verification that the rewritten JSON is valid before it replaces the live settings file.

Progressive Disclosure

No bundle files exist; the skill is a single well-sectioned document with a clear channels table and organized sections, and it needs no external references. Not 3: structure is good and nothing is buried; not 5: at ~113 lines with eight channels, some per-channel detection logic could be split into reference files, and the under-50-line simple-skill exception does not strictly apply.

Specificity

The description lists multiple concrete, comprehensive 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'), but 'Garbage collection for your Claude Code configuration' uses second-person voice, which the rubric penalizes by one point. Not 3: action coverage is comprehensive rather than partial; not 5: the second-person penalty applies.

Completeness

Both 'what' (scan channels for redundant/stale/orphaned items, then confirm-each-deletion cleanup) and 'when' ('Use when the user says ... or asks for a periodic config review') are explicit and concrete. Not 4: the 'when' clause enumerates specific trigger phrases rather than being merely adequate.

Trigger Term Quality

'clean up my config', 'config GC', 'too many skills', 'audit my setup', 'my .claude is bloated', and 'periodic config review' comprehensively cover the natural phrases a user would say, including slang ('bloated') and the skill's own nickname ('config GC'). Not 4: no common variation is missing.

Distinctiveness Conflict Risk

A clear niche (garbage-collecting the Claude Code configuration under ~/.claude) with distinct triggers ('config GC', 'my .claude is bloated') minimizes conflict with other skills. Not 4: the scope and paths named leave essentially no ambiguity about which skill should fire.