testdouble/han · han-plugin-builder/skills/agent-builder/SKILL.md

agent-builder skillA

agent-builder is agent-read markdown (skill) from testdouble/han: Builds a new Claude Code agent (subagent) from scratch through a relentless, evidence-based interview that walks the agent's design tree decision-by-decision — entity fit, domain focus and vocabulary, role identity, anti-patterns, description, model tier, tools, and self-containment — then reviews the finished agent against the plugin-building guidance and applies every fix it finds. Use when creating, authoring, scaffolding, designing, or drafting a new agent or subagent. Does not build a skill.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add testdouble/han/agent-builder@git:20260818.55bdb1d
Exact content
mdr add testdouble/han/agent-builder@sha256:4d3877bb5f7274b2

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_r75wa2z4e5imwfkz.svg)](https://markdownregistry.com/a/art_r75wa2z4e5imwfkz)

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Versions

versioncommittedcommitsizeaudit
git:20260818.55bdb1d latest2026-08-18 55bdb1d 15,444 BA view · diff
git:20260731.e79299f2026-07-31 e79299f 15,330 BA view · diff
git:20260730.78dc4f82026-07-30 78dc4f8 15,535 BA view · diff
git:20260730.e86a73d2026-07-30 e86a73d 15,355 BA view · diff
git:20260723.75448b52026-07-23 75448b5 15,016 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (15444 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

testdouble/han · 267 stars · license MIT · pushed 2026-09-15 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_r75wa2z4e5imwfkz
GET https://markdownregistry.com/api/v1/resolve?ref=testdouble/han/agent-builder
GET https://markdownregistry.com/api/v1/blob/4d3877bb5f7274b29e8e2f713886a88ca6daeb76649f5ce164531b578334875f

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.