connectonion

ConnectOnion is a Python agent framework built on one idea: you write the prompt and the tools, and it handles everything else. Plain functions become tools with no schema writing. The whole thing is Apache 2.0 and free, including the CLI, the prebuilt Gmail, calendar, and browser tools, and a ready-made chat frontend.

There is no server to run. It's a pip install, and a working agent is three lines of code. The interesting part is the host function: one call exposes your agent over HTTP and a peer-to-peer relay so other agents can discover and call it. Dangerous operations like shell commands go through a built-in approval system instead of you writing permission logic.

Solo builders and small teams get the most here. It's one of the fastest paths from idea to working agent in Python. Larger teams already invested in LangGraph (langchain-ai/langgraph) or CrewAI (crewAIInc/crewAI) won't find a reason to migrate.

The catch is maturity. The framework is young, the docs move fast, and the multi-agent relay network is the part most likely to change under you. Build side projects on it today, not your production support bot.