probity
Probity forces AI coding agents to follow your rules. It hooks into your agent and checks every file write and shell command before it happens. When an action breaks a rule, Probity blocks it and tells the agent why.
1 hook245
@nizosTesting
Plugin
tdd-guard
Enforces test-driven development in Claude Code by checking that tests are written before implementation code. Includes a setup skill that installs the matching test reporter for your framework. The creator says this project has moved to Probity, which new projects should use.
Plugin Signal65/100Solid
maintained96
capable14
documented80
adopted72
Claude Code
> /plugin marketplace add nizos/tdd-guard> /plugin install tdd-guard@tdd-guard
Codex
$ npx skills add nizos/tdd-guard -a codex
Cursor
$ npx skills add nizos/tdd-guard -a cursor
Gemini CLI
$ npx skills add nizos/tdd-guard -a gemini-cli
GitHub Copilot
$ copilot plugin marketplace add nizos/tdd-guard$ copilot plugin install tdd-guard@tdd-guard
OpenCode
$ npx skills add nizos/tdd-guard -a opencode
Windsurf
$ npx skills add nizos/tdd-guard -a windsurf
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TDD Guard
Important TDD Guard grew into Probity: the same TDD enforcement, now for Claude Code, Codex, and GitHub Copilot CLI, with more reliable validation and no test reporters to set up. New projects should start there. TDD Guard remains maintained for the projects that rely on it.
Automated Test-Driven Development enforcement for Claude Code.
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.
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, RSpec, Minitest)
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
- Ruby/RSpec & Minitest support: @Hiro-Chiba
Support
- Discussions - Ask questions and share ideas
- Issues - Report bugs and request features
License
Stars on GitHub
Momentum
- stars in total
- 2.4k
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@confident-aiQuestions about tdd-guard.
Install it with the command on its page. It includes setup. Its skills do not fire on their own yet. Free and open source.
- What is tdd-guard?
- nizos/tdd-guard is a plugin that enforces test-driven development in Claude Code, blocking changes that skip the test-first cycle. It ships a setup skill that detects your test framework and installs the matching reporter. The summary says it has grown into Probity, which new projects should use instead.
- How do I install tdd-guard?
- Run these in Claude Code: /plugin marketplace add nizos/tdd-guard then /plugin install tdd-guard@tdd-guard. Then prompt normally.
- Does tdd-guard auto-invoke its skills?
- Not yet. It is indexed on Flowy as a plain plugin.
- Is tdd-guard free?
- Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.
- Which coding agents can use tdd-guard's skills?
- tdd-guard installs in Claude Code, and its skills also install in Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf with the skills CLI. Each skill's page has the install command. Flowy's auto-invocation, which fires a skill when your prompt matches, runs in Claude Code only.
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