han-coding

A collection of coding tools for writing, testing, reviewing, investigating, and documenting software. It includes workflows for TDD, refactoring, API design, code overviews, and test planning.

In plain words
What is it for?
Use it when building features, changing existing code, reviewing a branch, investigating bugs, designing an API, or planning automated and manual tests.
Why use it?
It brings related development tasks into one add-on so an agent can follow consistent workflows across a project. The individual tools address both implementation and analysis work.

Plugin for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code
/plugin marketplace add testdouble/han
agentmods
npx agentmods add plugins/testdouble/han/han-coding
Clone the repo
git clone --depth 1 https://github.com/testdouble/han

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

han-coding scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

han-coding/.claude-plugin/plugin.json · 7 lines

What it actually says

{
  "name": "han-coding",
  "description": "Coding-facing skills for the Han suite: writing, reviewing, testing, investigating, and standardizing code. Home of the tdd skill, which drives a feature or behavior through a BDD-framed red-green-refactor loop with an enforced observed-failure gate, and the refactor skill, which restructures existing code without changing its behavior through a test-gated refactoring loop, plus design-an-api (designing an interface contract for one stated goal through an options round, a question round, and an adversarial validation round), code-review (comprehensive review of local changes), code-overview (a progressive-disclosure, understand-now overview of unfamiliar code or a PR's changes), code-walkthrough (a paced, one-step-at-a-time walk through a branch's changes in conversation), architectural-analysis (module-level coupling, data flow, concurrency, risk, and SOLID assessment), automated-test-planning (coverage-gap and edge-case test plans), manual-test-planning (plain-language manual test plans a person runs by hand), investigate (evidence-based root-cause debugging), and coding-standard (creating and updating coding standards). Depends on han-core and han-communication; bundled by the han meta-plugin.",
  "version": "3.3.0",
  "dependencies": ["han-communication", "han-core"]
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 7 lines scan A e2cee385195c

Subscribe to this mod's changes

han-coding is a plugin published in the GitHub repository testdouble/han (247 stars, last pushed 3d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.