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LangChain Forum - Topics tagged intro-to-langgraph

Null-drift: A bare-metal O(1) Memory Store for continuous LangGraph agents Interrupt does not work correctly in LangGraph Pre-interrupt() code re-runs on resume — anti-pattern, or is there a sanctioned way to detect resume? Would pre-inference routing help long-context agent workflows? Improving citation accuracy and reducing hallucinations in custom Parent-Child RAG pipeline (Gemma3:4B + FAISS+BM25 + Cross-encoder reranker) WikipediaLoader endup in JSONDecodeError Using LangGraph interrupt for multi-step wizards with branching — right tool or wrong abstraction? Built NORNR for spend governance in agent workflows Discussion about why LangGraph JS ToolNode doesn’t inject ToolRuntime.state like Python does, and what the correct workaround or intended design pattern is. No cost displayed in LangSmith when using LiteLLM + LangGraph LiteLLM Router in LangChain: Missing Model Name and Cost in LangSmith Traces I find langgraph chat in documents useful, how can I hook it up as mcp or skill or a tool for the Claude Code? Can I get User IDs and Bot IDs of bots used in Slack channels for personal projects [Docs/Cookbook] Request to add a design pattern for "Package-Skill" with internal retries Using the useStream frontend API with custom FastAPI backend When is it actually a failure? Diagnosing agent behavior beyond LangGraph traces Can the input and output of deep_agent's sub-agents be output in streaming mode? Complete context compression through middleware Feedback Wanted: My Structured Multi-Agent Research Assistant (Inspired by LangGraph Academy) Problems encountered when study is interrupted Can you provide a learning roadmap for LangChain and LangGraph suitable for beginners? What is the return type of StateGraph.compile()? Does the cache param do anything when using create_agent? Issues about the entry points of RAG knowledge Is the way RAG stores retrieved information in the state also just by directly concatenating it like historical memory? Regarding whether the knowledge base recall can be excluded from the context and used as a node-level system prompt for the response model Extending LangSmith Auto Cost Tracking to Include Agent API Calls Best Practice for Assigning MCP Tools to Sub-Agents in a Multi-Tool MCP Server? Reducing Latency in GPT-5: Controlling Reasoning in LangChain Advice for implementing complex Customer AI HealthCare Assistant Pattern for Persisting Structured Agent Outputs in LangGraph State (Instead of ToolMessage History) Langchiain deep_agent very slowly Stopping endpoint for deep agents Clarification on Official Container Images, Supported Python Versions, and the Recommended LangGraph Deployment Path Create_agent : Tool Invocation Failure in LangGraph Agent Chat model returns empty content when I inject a delayed ToolMessage from a scheduled callback Are dynamic tool lists allowed when using create_agent? Files in Agent Chat Make a llm.with_structured_output call a tool Seeking help with some merge message issues when LangGraph is called in parallel - LangGraph - LangChain Forum
LangGraph + PostgreSQL: Chat history and summarization best practice
prakash · 2026-04-20 · via LangChain Forum - Topics tagged intro-to-langgraph
Hi everyone, I am building a chatbot using LangGraph with PostgreSQL as the checkpointer and storage layer. C…

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