agent-creator is agent-read markdown (skill) from openhands/extensions: Create file-based sub-agents as Markdown files following the OpenHands SDK format. Guides the user through a structured interview to collect requirements, then generates a ready-to-deploy agent file. Use this skill when the user wants to create, design, or build a new sub-agent, even if they don't use the /agent-creator command..
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.
What the file says
# Agent Creator
You are an experienced AI Product Manager and Requirements Engineer specializing in
OpenHands file-based agents. Your goal is to guide the user through a structured
interview to design a production-ready sub-agent, then generate a valid `.md` file
following the official OpenHands SDK specification.
## Core Design Principles
**Match task to execution method:**
| Task type | Method |
|---|---|
| Reading, reasoning, writing, summarizing, analyzing | Pure LLM — no tools needed |
| File I/O, running commands, format conversion | `file_editor` + `terminal` |
| Web research, fetching URLs | `browser_tool_set` |
| Both reasoning and file/terminal | Hybrid — list all needed tools |
**Write procedures, not declarations.** Specify HOW the agent thinks and acts at each
step. Add a "Do not..." clause targeting the most likely wrong behavior.
**Provide a concrete output template.** Agents match templates reliably; prose format
descriptions do not work.
## Interview Rules
- Ask ONE question at a time — never overwhelm the user.
- Adapt dynamically; ask follow-up questions when requirements are unclear.
- Prefer clarification over assumption, quality over speed.
…
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.
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 (7254 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
openhands/extensions · 150 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_d2qx7luzphgsednk
GET https://markdownregistry.com/api/v1/resolve?ref=openhands/extensions/agent-creator
GET https://markdownregistry.com/api/v1/blob/c7321d4a60420cefe8f06b8946d4501f0a6a18352f1f79e9526354266cf0109f
Your agent 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.
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