Stella — Agentic AI Platform
The single AI orchestrator behind Fig's one-chat-box product. A LangGraph plan-and-perform loop on FastAPI + Claude drives every turn — building and deploying websites, generating image/video/music/slide media, researching the web and acting on the user's connected apps, all in one graph instead of a separate planner and executor. Parallelizable work fans out to recursive subagents: the same graph re-run with a narrowed toolset and a specialized prompt, so deep research can hit ~15 sources at once with no separate worker service. Turns stream over a resumable SSE block protocol backed by Redis event streams and PostgreSQL checkpointers, and a modular skills framework plus MCP servers load capabilities on demand.
- LangGraph
- FastAPI
- Claude
- MCP
- Subagents
- Python
- SSE
- Redis
- PostgreSQL
Private codebase · walkthrough on request