langroid/langroid: Multi-Agent LLM Programming Framework With Function Calling and Structured Output at 3.9K Stars

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Langroid provides a Python framework for building multi-agent LLM applications with function calling, structured outputs, and GPT/Claude integration. Unlike chain-based frameworks, Langroid models agents as first-class entities that communicate via messages, enabling complex multi-agent workflows. At 3,950 stars, it represents a growing alternative approach to agent orchestration focused on message-passing patterns.