Python LangGraph RAG AI Debugging Tip

🐛 A subtle Python bug that corrupted an entire AI-generated document I was using a LangGraph RAG agent to generate content for multiple document sections in parallel — each section with its own question. But the final document had duplicate content across sections. Different sections, same output. My first instinct was LangGraph. I debugged the agent, checked configurations, changed settings. Nothing worked. Then I printed the memory address of the dictionary being passed inside each thread. Every thread. Same memory address. That was the moment everything clicked. The threads weren't working with their own data — they were all pointing to the same dictionary object in memory. Each thread was overwriting the question, so every thread ended up running with the same question. Fix: One line — copy.deepcopy() inside the thread, before passing the dict to the agent. Every thread got its own independent copy. Unique questions. Unique outputs. Problem solved. Lesson: When parallel outputs look suspiciously similar — before blaming the AI, check your memory. #Python #LangGraph #RAG #Debugging #Multithreading #AI #LLM #ProblemSolving #MachineLearning

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