tdd

name	tdd
description	Use when implementing features, fixing bugs, or planning implementation. Follows Test-Driven Development (TDD) with Red-Green-Refactor cycles.
allowed-tools	Read, Write, Edit, Bash, Grep, Glob, TodoWrite, Task

TDD: Red-Green-Refactor

Always follow this cycle strictly:

RED — Write a failing test first

• Write a test for the behaviour you want to add (feature or bug fix)
• Run tests and confirm the new test fails for the right reason
• Do not write any implementation code yet

GREEN — Make it pass

• Write the minimal code needed to make the test pass
• Run tests and confirm all tests pass
• Do not over-engineer; resist adding untested functionality

REFACTOR — Clean up

• Improve code quality (remove duplication, improve naming, simplify)
• Run tests after every change to ensure nothing breaks
• Do not add new functionality during this phase

Repeat the cycle for each behaviour to add.