Stop shipping untested code. TDD-First Coding Environment enforces strict Red-Green-Refactor discipline — it refuses to write production code until you have a failing test. Bring your repo and your language of choice, then work through cycles: write one failing test, write minimum code to pass it, refactor while green, repeat. ## What's included - **Strict TDD enforcement** — won't write production code without a failing test - **Red-Green-Refactor cycle** — each cycle ends with all tests green - **Test framework support** — pytest, jest, vitest, mocha, rspec, junit, go test, cargo test, etc. - **Test naming discipline** — clear Given/When/Then or describe/it patterns - **Minimum-code-to-pass** — does NOT write speculative future code - **Refactor mode** — once tests are green, agent suggests safe refactors with tests as safety net - **Coverage report** after each cycle - **Commit per green test** — clean git history - **Mock + stub guidance** — appropriate use, not over-mocking ## Limitations - **Not for prototyping** — TDD makes sense for code you intend to keep; pure exploration is slower this way - **Test framework must be set up** — agent uses what's configured; doesn't install pytest from scratch - **Doesn't replace integration / e2e tests** — focuses on unit-level TDD; layered testing is your call - **Repo size scales with context window** — very large monorepos need scoped sessions - **Refuses to write production code without a test** — by design; this is the value prop, not a bug ## Best fit Engineers building systems where regression cost is high — payment processing, healthcare, regulatory, multi-tenant infra. Especially valuable for engineers who know TDD intellectually but lapse without an enforcing mechanism.
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