MARSYS is an open-source Python framework for building multi-agent workflows. Define your agents and who talks to who – the framework handles parallel execution, branch isolation, convergence, context management, and routing automatically. It works with 7+ LLM providers out of the box (OpenAI, Anthropic, Google, local models), ships with ready-to-use agents (browser, file operations, code executor, data analyst), and lets you fine-tune local models directly from execution traces. pip install marsys and you’re running.
