subtopic

Agents and chains behind a clean API

Expose the agent system through your FastAPI service: POST /v1/conversations to start, POST /v1/conversations/{id}/messages with streaming replies, GET for history; store conversation state in PostgreSQL via a checkpointer so any server can continue any conversation; human-approval steps become API endpoints (approve/reject). Know the managed options (LangGraph Platform, LangServe-style servers) and when they save time.

Builds on: 2.4 Build the agent, 2.5 Memory, 2.6 Human-in-the-loop