Conciseness

The body is dense with repo-specific rules and gotchas Claude would not know (Cluso embed exclusion, the check.js regex conflation, vendor bundle regeneration) and avoids explaining general concepts; a few clauses are slightly verbose (e.g. the long random-island-preview sentence, 'Owner-approved override of the prior rule' aside), so it sits at anchor 4 ('Efficient; minor instances of over-explanation that could be trimmed').

Actionability

It gives concrete, executable commands and code throughout — 'npm run vendor:three', 'npm run build', the perl/node parser one-liner, 'http://localhost:3000/tiny-world-builder', the exact check.js regex, and copy-paste HTML examples — fully executable and covering the common cases, matching anchor 5 ('Fully executable; copy-paste ready code or commands; specific examples cover the common cases').

Workflow Clarity

The body sequences edit-time rules, an explicit validation block (npm test, parser one-liner, browser check, console errors), and a feedback-loop gotcha ('has burned us twice') with regex + fix pattern; validation checkpoints and error-recovery guidance are explicit, fitting anchor 5 ('Clear sequence with explicit validation steps; feedback loops for error recovery').

Progressive Disclosure

Content is well-organized into labeled sections (Core rules, Validation, the script gotcha, Related durable systems) with one-level-deep pointers to sibling skills (.codex/skills/tinyworld-runtime-state, tinyworld-island-and-planes); however no bundle files exist and some durable detail (random-island-preview, Cluso) is inlined rather than split out, so it lands at anchor 4 ('Good structure; most content appropriately placed; minor organization gaps').

Specificity

The description names a concrete domain (Tiny World Builder repo, tiny-world-builder.html) and a concrete preservation action, but the only action verb is 'preserve ... structure and workflow' — it does not enumerate multiple distinct capabilities, so it falls at anchor 3 ('Names domain and 1-2 concrete actions, but not comprehensive').

Completeness

It answers 'when' explicitly ('Use when editing the Tiny World Builder repo, especially tiny-world-builder.html') and 'what' ('preserve the static classic-script Three.js r185 app structure and local edit/reload workflow'); both are present, though 'what' leans toward a single preservation goal rather than multiple concrete actions, fitting anchor 4 ('Has both what and when; when could be more explicit or specific').

Trigger Term Quality

It opens with a natural trigger ('Use when editing the Tiny World Builder repo') and names the key file 'tiny-world-builder.html', but lacks common synonyms/variations a user might say (e.g. 'tiny world', 'Three.js builder', 'r185') beyond the repo name, placing it at anchor 3 ('Some relevant keywords but missing common variations or synonyms').

Distinctiveness Conflict Risk

The trigger is tightly bound to a specific repo and file ('Tiny World Builder repo', 'tiny-world-builder.html', 'Three.js r185'), creating a clear niche with minimal overlap risk against other skills, matching anchor 5 ('Clear niche with distinct triggers; minimal conflict risk').