Conciseness

Every bullet carries codebase-specific facts Claude cannot know — file ownership ('engine/world/47-worlds-room.js owns the playable... avatar'), exact crop math ('repeat.y = 1 / rows'), exact row orders, exact commands — with zero concept explanation or padding. Anti-drift check: anchor 4 requires 'minor instances of over-explanation' and none are present; dense detail here is earned specificity, not verbosity.

Actionability

Highly concrete: exact commands ('python3 tools/generate-playable-25d-classes.py', 'npm test', 'npm run build'), exact API names ('setAvatarClass(name)', 'cycleAvatarClass(delta)'), exact paths, and precise failure modes ('four stacked bodies render in-world'). Not 5 because the core step of the 'cloning into character classes' use case — 'Add... an overlay function in tools/generate-playable-25d-classes.py' — is given no signature or example, leaving the skill's most creative step underspecified; not 3 because everything else is executable rather than pseudocode.

Workflow Clarity

The 'When adding a class' section is a clear 3-step sequence ending with a validation checkpoint ('Regenerate sheets, then run npm test and npm run build'). Not 5 because sheet regeneration is a batch write operation with no explicit feedback loop (no 'if tests fail, fix and re-run' guidance); not 3 because the sequence is explicit and a real validation step is present, unlike the 'validation gaps' anchor.

Progressive Disclosure

The skill is under 50 lines with no external reference material needed, and per the rubric's simple-skill guidance this scores 5 with well-organized sections. The body is cleanly sectioned (Runtime / Assets / When adding a class), all paths referenced are project files verified to be described consistently, and there is no content that belongs in a separate bundle file.

Specificity

Names the domain and three concrete actions — 'changing the playable 2.5D template sprite', 'cloning it into character classes', 'wiring idle/walk/attack sprite-sheet playback' — but coverage has minor gaps: the skill also governs avatar runtime wiring and sheet regeneration, which the description omits. Not 5 because coverage is not comprehensive; not 3 because three specific actions exceed the '1-2 concrete actions' anchor.

Completeness

The 'Use when...' clause explicitly covers 'when' with three concrete trigger tasks, and the actions inside it ('changing... cloning... wiring...') double as the 'what'. Not 5 because the 'what' is never stated independently — what the skill actually contains (runtime integration, asset layout, regeneration tooling) must be inferred from the trigger list; not 3 because an explicit trigger clause is present and the 'what' is more than weakly implied.

Trigger Term Quality

Good natural keyword coverage — 'sprite sheet' (as 'sprite-sheet playback'), 'character classes', 'idle/walk/attack', 'playable' — phrasing a user in this codebase would plausibly say. Not 5 because common variations are missing ('avatar', 'texture', '.png', 'character sprite'); not 3 because the terms present go beyond 'some relevant keywords' with several natural user-facing phrases.

Distinctiveness Conflict Risk

A clear niche ('playable 2.5D template sprite', 'character classes') with triggers unlikely to fire for unrelated skills, but the body itself warns against confusion with a closely related crowd-system skill ('This is not the crowd system'), and the description does not carry that disambiguation. Not 5 because of that un-flagged overlap risk with a sibling skill; not 3 because 'playable template sprite' plus 'character classes' is far more specific than 'somewhat specific'.