TDD Guard

Automated Test-Driven Development enforcement for Claude Code.

Overview

TDD Guard ensures Claude Code follows Test-Driven Development principles. When your agent tries to skip tests or over-implement, TDD Guard blocks the action and explains what needs to happen instead.

Click to watch TDD Guard in action

Features

Test-First Enforcement - Blocks implementation without failing tests
Minimal Implementation - Prevents code beyond current test requirements
Lint Integration - Enforces refactoring using your linting rules
Customizable Rules - Adjust validation rules to match your TDD style
Flexible Validation - Choose faster or more capable models for your needs
Session Control - Toggle on and off mid-session

Getting Started

Requirements

Node.js 22+
A supported test framework (Vitest, Jest, Storybook, pytest, PHPUnit, Go, Rust)

Installation

Open Claude Code in your project and run:

/plugin marketplace add nizos/tdd-guard
/plugin install tdd-guard@tdd-guard
/tdd-guard:setup

This adds the marketplace, installs the plugin, and configures the test reporter for your project. You may need to restart your terminal session or IDE extension for the setup skill to appear. For manual installation and configuration, see the installation guide.

Configuration

Custom instructions - Customize TDD validation rules
Lint integration - Automated refactoring support
Strengthening enforcement - Prevent agents from bypassing validation
Ignore patterns - Control which files are validated
Validation Model - Choose faster or more capable model
All settings - Complete settings documentation

Security

TDD Guard hooks run with your user permissions. We maintain automated security scanning, dependency audits, and welcome source code review. See Claude Code's security considerations for more on hook safety.

Development

Contributing

Contributions are welcome! See the contributing guidelines to get started.

Contributors:

Python/pytest support: @Durafen
PHP/PHPUnit support: @wazum
Rust/cargo support: @104hp6u
Go support: @sQVe, @wizzomafizzo
Storybook support: @akornmeier

Roadmap

Expand language and test framework support
Validate file modifications made through MCPs and shell commands
Encourage meaningful refactoring opportunities when tests are green
Add support for multiple concurrent sessions per project

Support

Discussions - Ask questions and share ideas
Issues - Report bugs and request features

License

MIT