Mostly efficient with no concept-explanation fluff, but the '<required>' TodoWrite block and the detailed RED/GREEN/REFACTOR sections restate the same workflow, so not every token earns its place; a 3 would require eliminating that redundancy.

Provides fully executable TypeScript examples, concrete bash commands ('npm test path/to/test.test.ts'), and specific verification checklists; the good/bad example pairs are copy-paste ready and contrastive.

Clear RED/GREEN/REFACTOR sequence with explicit validation checkpoints ('Verify RED - Watch It Fail', 'Verify GREEN - Watch It Pass'), checklists, and a feedback loop ('three loops without making progress, switch to ...').

Self-contained single-purpose workflow with no bundle files and no nested references; content is organized into clearly labeled sections with easy navigation, which fits the well-organized-sections allowance for single-purpose skills.

Lists multiple concrete actions — 'write the test first', 'watch it fail', 'write minimal code to pass' — matching the anchor for several specific concrete actions; not below since it goes well beyond naming only a domain.

Explicitly answers both what ('write the test first, watch it fail, write minimal code to pass') and when ('Use when implementing any feature or bugfix'); the explicit 'Use when' clause clears the completeness cap.

Contains natural phrases users say ('write the test first', 'watch it fail', 'implementing any feature or bugfix') with good coverage; exceeds the single-keyword anchor for 2, though the 'TDD'/'test-driven' abbreviation is absent.

Occupies a clear niche (test-first development) with distinctive triggers unlikely to match other skills; the 'any feature or bugfix' opening is broad but the test-first qualifier unmistakably scopes it to TDD.