Generate Your Agent Harness Boilerplate
Build starter code for an AI agent -- system prompt, tool schema and the tool-calling loop -- for Claude or OpenAI, in Python or TypeScript.
Generate BoilerplateWhy you'll like it
Claude & OpenAI
Generate the correct tool-calling format for Anthropic (Claude) or OpenAI, in Python or TypeScript.
Full Tool-Calling Loop
Get a working loop that sends messages, executes tool calls, and feeds results back until a final answer.
Custom Tools & Parameters
Define as many tools as you need, each with its own typed parameters, and get a matching schema and TODO stub.
One-Click Copy & Download
Copy the generated code to your clipboard, or download it as a ready-to-edit file.
Runs in Your Browser
Your system prompt and tool definitions never leave your browser -- nothing is sent to our servers.
No Sign-Up Required
Start generating your boilerplate right away -- there's no account to create and nothing to install.
How it works
Pick your language & provider
Choose Python or TypeScript, and Anthropic (Claude) or OpenAI.
Define your agent
Set the system prompt, model and tools -- each tool with its own parameters.
Copy or download
Copy the generated code, or download it as a ready-to-edit starter file.
Frequently asked questions
What is an AI agent harness?
An agent harness is the scaffolding code around a raw LLM call that turns it into a working agent -- the loop that sends messages, checks for tool calls, executes them, and feeds the results back until the model produces a final answer.
Is this generator free?
Yes, completely free with no sign-up required. Everything runs in your browser.
Does this tool store my system prompt or tool definitions?
No. Nothing you type here is sent to or stored on our servers -- the code is generated entirely in your browser.
Will the generated code run as-is?
It will run once you install the relevant SDK, set your API key as an environment variable, and implement the TODO stubs for each tool -- it's a working starting point, not a finished agent.
Can I add multiple tools with different parameters?
Yes. Add as many tools as you need, each with its own parameters, and they will all be included in the generated tool schema.
Which providers and languages are supported?
Python and TypeScript, for both Anthropic (Claude) and OpenAI -- four combinations in total, each using that provider's official tool-calling format.
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