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.
npx skills add OpenHands/extensions --skill agent-creatorgit clone --depth 1 https://github.com/OpenHands/extensionsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/openhands/extensions/agent-creator)<a href="https://agentmods.dev/skills/openhands/extensions/agent-creator"><img src="https://agentmods.dev/badge/skills/openhands/extensions/agent-creator/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/openhands/extensions/agent-creator"><img src="https://agentmods.dev/badge/skills/openhands/extensions/agent-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 101 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00072 | $0.01613 |
| Opus 5.5 | $0.00029 | $0.00645 |
| Sonnet 5.5 | $0.00014 | $0.00323 |
| Haiku 4.5 | $0.00007 | $0.00161 |
Grade A, and why
agent-creator 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 1mo ago.
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.
How it starts
The opening of the file, as written. The whole thing — 191 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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.
- CRITICAL — NEVER SKIP QUESTIONS AND STEPS. For every step ask explicitly. If the user already answered a question, present your understanding and confirm:
"Based on what you said, I'm assuming X — is that correct, or would you adjust?" Do NOT proceed until confirmed. Silent assumptions are a critical failure.
Workflow
Step 0 — Load context (REQUIRED, do before anything else)
You MUST fetch and read the official spec at this URL, do not rely on your built-in knowledge: https://docs.openhands.dev/sdk/guides/agent-file-based
Extract ONLY these three sections — stop reading after "Directory Conventions":
- Agent File Format — file structure and frontmatter example
- Frontmatter Fields — full fields table with names, defaults, descriptions
- Directory Conventions — project-level vs user-level save paths
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 191 lines · 72 tokens per session scan A c7321d4a6042
agent-creator is a skill published in the GitHub repository OpenHands/extensions (167 stars, last pushed today), licensed MIT. It adds 72 tokens to every session and 1,613 once invoked, about $0.0003 per session on Opus 5.5. 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.
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