testdouble/han

Han: For the Solo Product Engineer

<img src="images/han-banner.png">

Han is a suite of AI skills and agents for solo (or small-team) product engineers. It combines evidence-based planning, test-driven implementation, full documentation maintenance, deep code review, and architectural analysis into a team of specialists you can dispatch from Claude Code.

What this plugin does

Han turns planning, implementation, review, and documentation work that would normally take a team into a set of deterministic skills you run from Claude Code. Each skill dispatches specialist agents (project managers, adversarial reviewers, investigators, architectural analysts, testing and security specialists) to do the judgment-heavy work, then folds their findings into an artifact you can trust.

The skills are designed to compose. You can plan a feature, then plan its implementation, then iterate on the plan, then build it test-first, then review the resulting code, then write the PR description. All through named skills that hand off to each other cleanly.

Read Concepts for the skill-and-agent model that runs through the whole plugin.

For Solo Product Engineers and Small Teams

Han is purpose-built for solo product engineers and small teams, instead of large teams or enterprise. This does not mean it can't work in larger teams, though. Read about why Han's focus is solo product engineers and small teams to understand Han's positioning and what it does not bring to the table.

Installation

Add the Test Double skills marketplace to Claude Code, then install the plugin:

/plugin marketplace add testdouble/han
/plugin install han@han

Han ships as multiple plugins:

• han: the parent plugin that brings in han.core, han.github, and han.reporting
• han.core: the planning, investigation, review, and documentation skills plus every agent
• han.github: GitHub-facing skills like posting a code revi