# Implement Feature Tdd > Use this workflow to implement ANY new feature following Test-Driven Development strictly. - Skill: `tomevault-io/implement-feature-tdd` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/implement-feature-tdd` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/implement-feature-tdd/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Productivity - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/implement-feature-tdd --- ## Workflow Steps 1. **Write failing E2E tests FIRST (RED)**: - Write E2E test for API boundaries (Controller/Resolver) using `/add-e2e-test` skill. - Run `npm run test:e2e` to verify it FAILS. 2. **Write unit tests (RED)**: - Use the `/add-tests` skill to write failing unit tests for the Services and Resolvers/Controllers. - Run `npm run test` to verify they FAIL. 3. **Write implementation (GREEN)**: - Implement the minimum code required in the Controller/Resolver and Service to make both E2E and unit tests pass. - Run tests until they PASS. 4. **Refactor and Check (REFACTOR)**: - Run `npm run check` to fix linting and types. - Run `npm run test:cov` to ensure test coverage remains above 80%. Do not write production code before writing the test assertions. --- > Source: [uxname/liteend](https://github.com/uxname/liteend) — distributed by [TomeVault](https://tomevault.io).