# Tdd Implementation > Enforces Test-Driven Development methodology Use when this capability is needed. - Skill: `tomevault-io/tdd-implementation` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/tdd-implementation` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/tdd-implementation/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/tdd-implementation --- Implements strict Test-Driven Development workflow: ## TDD Cycle ### 1. Red Phase - Write a failing test that clearly specifies desired behavior - Test should be specific, readable, and focused on one piece of functionality - Use descriptive test names that explain what is being tested - Include edge cases and error conditions in test scenarios ### 2. Green Phase - Write the minimal code required to make the test pass - Focus on making the test work, not on perfect implementation - Avoid adding functionality beyond what the test requires - Use simple, straightforward solutions initially ### 3. Refactor Phase - Improve code design while keeping tests green - Apply design patterns and clean code principles - Remove duplication and improve readability - Ensure all tests still pass after refactoring ## Verification Steps After each TDD cycle: 1. **Test Execution**: Run `uv run pytest` to verify all tests pass 2. **Quality Checks**: Run `uv run black .` for formatting 3. **Linting**: Run `uv run flake8 .` for style compliance 4. **Type Checking**: Run `uv run mypy .` for type safety 5. **Coverage**: Periodically run `uv run pytest --cov=ras_balancer` ## Chunking Strategy - Work in small, manageable pieces of functionality - Each chunk should implement one specific feature or behavior - Verify each chunk completely before moving to the next - Maintain a continuous green state throughout development ## Integration with AGENTS.md Follow project conventions for: - Test structure and naming - Assertion patterns (`np.allclose`, `pytest.raises`) - Fixture usage and test organization - Coverage requirements and quality gates This skill ensures systematic, test-first development that maintains high code quality throughout the implementation process. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/radema) — claim your Tome and manage your conversions.