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Building an AI PDF Chatbot with LangChain, MongoDB Atlas Vector Search, and Gemini

A working RAG pipeline for chatting over PDF documents — chunking, embeddings, an Atlas vector index, and a retrieval chain wired up to Gemini.

Sep 10, 2026·5 min read
raglangchainmongodbgeminivector-search
01Debugging a Windows-Only LangGraph CLI CrashA FileNotFoundError that only happened on my machine, traced down to mixed path separators inside the LangGraph CLI's dependency resolver.debugginglanggraphwindowsclipython02The Circuit Breaker Pattern, Explained by Someone Who Used to Install Real OnesRetry storms, cascading failures, and why the software pattern named after an electrical safety device works for exactly the same reason the real thing does.backendsystem-designresiliencetypescript