Every section earns its place. No explanation of what TDD is conceptually—jumps straight to the cycle. The worked example is dense but necessary for demonstrating triangulation. Anti-patterns table is efficient.

Fully executable Python examples throughout. The Cart example shows complete red-green-refactor with real code. The rate limiter transcript provides a realistic worked example. Output format template is copy-paste ready.

The cycle diagram is explicit with clear sequencing. Each step has validation built in ('Run it. Confirm it fails for the RIGHT reason'). The worked transcript demonstrates the feedback loop explicitly. Anti-patterns table reinforces what not to skip.

Well-structured single file appropriate for the content scope. Clear sections progress from concept → examples → anti-patterns → output format. No need for external references given the self-contained nature of TDD instruction.

Lists multiple specific concrete actions: 'writes a failing test from a requirement', 'generates the minimal code to pass it', 'refactors', and explicitly names the methodology 'strict red-green-refactor cycles'.

Clearly answers both what (generates code test-first with red-green-refactor cycles) AND when with explicit 'Use when' clause covering three distinct scenarios: clear specs, uncertain design, and high coverage needs.

Includes some relevant terms like 'test-first', 'red-green-refactor', 'coverage', and 'tests to drive it', but misses common user phrases like 'TDD', 'test driven development', 'unit tests', or 'write tests first'.

The 'test-first' and 'red-green-refactor' methodology creates a clear niche distinct from general coding skills or testing skills; unlikely to conflict with skills that write tests after code or general development skills.