Conciseness

Mostly efficient with purposeful sections, but the 'CRITICAL RULE' block re-states the code-block preservation rules already given under 'Preserve EXACTLY', and the backup location is stated twice (Purpose and Boundaries). Not 4: the duplication is more than a minor trim (~16 redundant lines); not 2: the rest of the body is dense and earns its tokens.

Actionability

Fully executable guidance: the exact command ('python3 -m scripts <absolute_filepath>'), explicit failure handling (retry up to 2 times, leave original untouched), concrete extension allow/deny lists, and two worked before/after examples covering the common cases. Not 4: no meaningful gaps — everything needed to run the skill is copy-paste ready.

Workflow Clarity

Numbered process with explicit validation ('validate output (no tokens)'), a bounded feedback loop ('cherry-pick fix ... retry up to 2 times'), and safe failure ('report error to user, leave original file untouched') — with a backup made before the destructive overwrite. The destructive-operation cap does not apply since validation and error recovery are present. Not 4: no validation gaps identified.

Progressive Disclosure

Well-organized single-file structure with clean, verified one-level references into the scripts bundle ('scripts/__main__.py', 'scripts/compress.py' both exist; no references/ or assets/ dirs). Not 5: at ~106 lines (over the 50-line simple-skill threshold), the detailed Compression Rules and Pattern sections could be split one level deep to keep SKILL.md a leaner overview; not 3: structure is good and references are clearly signaled.

Specificity

Names the domain ('memory file such as CLAUDE.md or a todo list') and 1-2 concrete actions ('Compress ... into caveman format', 'keeping a readable backup'), but coverage is not comprehensive — one core capability rather than several listed actions. Not 4: it does not list several specific actions; not 2: the actions given are concrete, not generic.

Completeness

The 'what' is clear and concrete, and a 'when' is explicitly present via 'Trigger: /caveman-compress', but only as a slash command rather than a natural-language 'Use when ...' clause, so it could be more explicit. Not 5: no concrete natural trigger phrases; not 3: trigger guidance is explicit, not merely weakly implied.

Trigger Term Quality

Good natural keyword coverage ('Compress', 'memory file', 'CLAUDE.md', 'todo list', 'save input tokens'), but common synonyms ('shrink', 'reduce tokens') and file extensions (.md) are missing, and the only explicit trigger is the slash command. Not 5: coverage is not comprehensive; not 3: several relevant natural terms are present, matching 'a few natural terms missing'.

Distinctiveness Conflict Risk

Caveman-format compression of memory files (CLAUDE.md, todo lists) is a clear niche with a distinct trigger and minimal conflict risk with other skills. Not 4: no meaningful overlap with closely related skills — the object ('memory file such as CLAUDE.md') disambiguates the otherwise ambiguous word 'compress'.