Free · Open source · Runs in your browser
Build an AI Agent in
60 Lines of Python
No framework. No install. See what LangChain, CrewAI, and AutoGen actually do — by building it yourself.
9 interactive lessons. Write real Python, call real LLM APIs, see real traces. Everything runs in your browser.
This is the entire agent loop
while True:
response = llm(messages, tools)
if response.tool_call:
result = run_tool(response.tool_call)
messages.append(result)
else:
breakWatch the loop run. This is what every agent framework does.
Runs in Your Browser
Python via Pyodide. Real code, real API calls, real traces. No terminal, no venv, no Docker.
No Framework Required
Raw HTTP calls to the LLM API. See the actual POST request. No SDKs hiding the work.
See What Frameworks Do
Every lesson shows the LangChain or CrewAI equivalent — then the plain Python underneath.
9 lessons. Each one builds on the last.
Start anywhere. Every lesson runs live in your browser.
From a single function call to a complete agent framework — learn tool calling, conversation memory, state management, policy gates, and self-scheduling.
One function. One HTTP POST.
That's where it starts. The first lesson takes 2 minutes.
Start Lesson 1 →