Han is a plugin that gives solo product engineers access to 15 specialized AI skills and 21 AI agents that work together like a small team. It runs inside Claude Code, an AI coding assistant. You can use it to plan features through evidence-based interviews, review code with adversarial eyes, investigate bugs with root-cause analysis, maintain documentation, and post detailed pull request reviews—all by calling simple named commands. The skills are designed to compose, so planning feeds into implementation, which feeds into review, which feeds into documentation. It's built by Test Double, a software consulting company, and is open source under the MIT license.
How It Works
As a solo engineer, you wish you had specialists to bounce ideas off—someone to review your code, help you plan features, and keep your docs up to date.
You connect Han to your AI coding assistant with two simple commands, unlocking a whole suite of specialist skills you can call on whenever you need them.
You ask your assistant to plan a feature, and it brings in a project manager agent who interviews you, challenges your assumptions, and builds a solid plan.
Run an investigation skill that digs through your code, finds the root cause, and validates any proposed fix before you commit to it.
Have a code review skill examine your changes from multiple angles—security, architecture, testing coverage—and post feedback directly to your pull request.
Keep your documentation fresh with a skill that creates and maintains reference material as your project evolves.
The agents hand off to each other seamlessly—planning feeds into review, review feeds into documentation—so nothing falls through the cracks.
You have a feature spec, tested code, thorough review, and updated docs—all from a team of AI specialists that fits in your pocket.
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