langchain-ai / langchain

The agent engineering platform.

langchain-ai / langgraph

Build resilient agents.

decodingai-magazine / building-a-coding-agent-from-scratch-course

Learn harness engineering by building Claude Code from scratch. Free, open-source course: 8 articles, 6 videos, 1 codebase.

pydantic / pydantic-ai

How Python does AI. Agents, realtime voice, image generation, embeddings. Every model, every interface, typed end to end.