agent-builder SKILL.md skillA
agent-builder from testdouble/han is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add testdouble/han/agent-builder@git:20260818.55bdb1dPins git:20260818.55bdb1d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- testdouble/han
- Path
han-plugin-builder/skills/agent-builder/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260818.55bdb1d, committed Aug 18, 2026
- First version recorded
- Jul 23, 2026
- Size
- 15,444 bytes
- Repository stars
- 338
- License
- MIT
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…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
## Project Context
- personal config directory: !`bash "${CLAUDE_PLUGIN_ROOT}/scripts/han-config-dir.sh" 2>/dev/null || echo "$HOME/.claude"`
- project .han/config.md: !`cat .han/config.md 2>/dev/null || echo ""`
As your first action, use the Read tool on `.han/config.md` inside the `personal config directory` path above. A read
that returns no file is no personal configuration: continue silently. When that file or the `project .han/config.md`
probe supplies content, apply it per [config-rule.md](../../references/config-rule.md), which governs precedence
between the two files, relative-path resolution, and what to do with a file that reads but cannot be used.
## Guidance Location
The authoritative agent-authoring guidance ships in this plugin. Read the specific document a decision needs, when that
decision is on the table — never read them all up front, because that defeats progressive disclosure and burns context
on guidance the current agent does not touch.
- Plugin-building guidance root: `${CLAUDE_PLUGIN_ROOT}/skills/guidance/references/`
- Agent-specific guidance: `${CLAUDE_PLUGIN_ROOT}/skills/guidance/references/agent-building-guidelines/`
…Read the whole file at its exact version.
How to install
mdr add testdouble/han/agent-builder@sha256:4d3877bb5f7274b2The line at the top of this page pins the label git:20260818.55bdb1d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_r75wa2z4e5imwfkz)
6 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Jul 23, 2026 and Aug 18, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260818.55bdb1d latest | 2026-08-18 | 55bdb1d | 15,444 B | A | view · diff |
| git:20260731.e79299f | 2026-07-31 | e79299f | 15,330 B | A | view · diff |
| git:20260730.78dc4f8 | 2026-07-30 | 78dc4f8 | 15,535 B | A | view · diff |
| git:20260730.e86a73d | 2026-07-30 | e86a73d | 15,355 B | A | view · diff |
| git:20260723.75448b5 | 2026-07-23 | 75448b5 | 15,016 B | A | view |
Audit of the latest version
- 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
testdouble/han · 338 stars · license MIT · pushed 2026-11-01 · 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
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.