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Healthcare RAG Agent
3-tool LangGraph RAG agent over CMS Medicare regulations. Hybrid retrieval (pgvector + BM25 fused with RRF) and a BGE cross-encoder reranker achieve 93.1% routing accuracy and 1.00 Recall@5. Deployed with a FastAPI/SSE streaming backend and an MCP server. Built with Python, LangGraph, pgvector, and FastAPI.