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LangChain Forum - Topics tagged python-help

Best practices for self-hosting LangGraph Server OSS without LangGraph keys Dynamically Enabling/Disabling Graphs in a LangGraph Server at Runtime LangGraph thread copy can take 12+ minutes: recommended production pattern? Will DeltaChannel be the default for AgentState.messages, or expected to stay opt-in? Proposal: additional docs for implementing custom DB checkpointers or a guide on generic base checkpointer Prompt_cache_retention: '24h' supported in langchain agents and where to provide it, inside invoke or while creating client? Could RAG pipelines realistically cause deployment timeouts, is Render suitable for first-time RAG deployments? How do I use langchain_postgres' init_vectorstore_table correctly? Support timedelta for CachePolicy.ttl, consistent with TimeoutPolicy Anyone confirms this issue that deepagent ui streaming is disturb by update in deepagent or bug issue Best Stack for Building AI Applications Seeking help regarding the connection between Websocket and tool calls Tool invocation error with empty error message when using `InjectedState` + `Command` return in async tool How to use @langchain/react Built llmsessioncontract on AgentMiddleware: runtime enforcement of tool-call protocols — feedback wanted Improving citation accuracy and reducing hallucinations in custom Parent-Child RAG pipeline (Gemma3:4B + FAISS+BM25 + Cross-encoder reranker) Built a live autonomous AI agent network using LangGraph-style economics — looking for feedback How to use tool calling using ChatLlamaCpp and Gemma 4 E4B with create_agent? The Docs says open router can be used with init_chat_model but throws an error Interested to contribute to langgraph postgre checkpointer for multiple adapter support SSL certificate error from httpx with LangGraph server [Feature Request] Wire allowed_msgpack_modules in langgraph.json Serving an agent with the LangGraph CLI dev command Proposal: implement delete_for_runs for SQLite checkpoint savers WikipediaLoader endup in JSONDecodeError Human-in-the-loop approval dashboard for LangGraph agents — open source, free to deploy Should interrupt() be split into two primitives — one for human input, one for s2s data fetching? Feature Request: Driver abstraction for checkpoint-postgres: to build support for asyncpg and other adapters .Interested to contribute to langgraph (python) Feature Request: @task metadata How should I provide an agent to a LangGraph server? Parallel astream() on the same compiled graph leaks messages between streams Where should I define the name and description for subagents? Add Qdrant-backed checkpoint saver and memory store (langgraph-checkpoint-qdrant) The output content has been corrupted Feature Request: Simple cryptographic provenance for who authorized what in LangGraph multi-agent graphs LangGraph + PostgreSQL: Chat history and summarization best practice Using SQLRecordManager multi-agent systems debugging agent-to-agent Proposal: Add save_local and load_local to USearch VectorStore (Feature Parity with FAISS) Tiny LangGraph -> Assay evidence sample from tasks v2 Help with local RAG pipeline – poor retrieval quality, wrong page numbers LOGIC.md — declarative reasoning contracts that compile to LangGraph StateGraph Distinguishing internal vs final streamed chunks in Supervisor multi-agent architecture Are people hitting race conditions in multi-agent LangChain setups? How do ContextEditingMiddleware and SummarizationMiddleware interact when used together?Combining ContextEditingMiddleware + SummarizationMiddleware — execution order and behavior when both trigger? How to register type in langgraph Are there any frontends for interacting with a LangGraph agent? Langchain.schema is not available while using in python code In-place model update on a compiled create_agent and per-subagent model update for deep agents - is this possible? Feature Request: Native Support for A2A Protocol (Remote Agents as Sub-Graphs) Feature Request: Image Input support for ChatMistralAI Multiple response formats when creating agents? Unable to parse docstring from OpenAI schema Hosting an agent server on Heroku How should I deploy a self-hosted multi-agent system? No cost displayed in LangSmith when using LiteLLM + LangGraph New integration: langchain-w2a — LangChain tools for W2A-enabled websites LiteLLM Router in LangChain: Missing Model Name and Cost in LangSmith Traces Issues and PRs in langchain-experimental have been stalled for a month Is there anyway that I can remove grep, glob, write_todos, task from deepagents? ObjectId handling by msgpack in MongoDb checkpointer Typing of streamed chunks? When I call a MCP Tool using FastMCP, I am not getting Context initialized correctly How to disable automatic_function_calling with ChatGoogleGenerativeAI How to implement the Router Pattern in Deep Agents? (Routing to multiple specialized Deep Agents with different structured outputs) I find langgraph chat in documents useful, how can I hook it up as mcp or skill or a tool for the Claude Code? Bogus warning messages after upgrading dependencies which could have security impact if not addressed `anyio.CancelScope(shield=True)` not working inside langgraph node Handling Non-PDF File Attachments in LangChain HumanMessage How are teams handling evals when agent pipelines span multiple LangSmith projects? DeepAgents CLI: Do subagents have to be defined in Python, or can they be defined via YAML? Feature request: Configurable PostgreSQL schema for langgraph-checkpoint-postgres (parity with LangGraphJS) Using the useStream frontend API with custom FastAPI backend Qwen 3.5 tool calling How to propagate cancellation across multi-level LangGraph agents When is it actually a failure? Diagnosing agent behavior beyond LangGraph traces When to use config['configurable'] vs. context in graph nodes? Tool.func typing [DashScope] reasoning parameter on ChatOpenAI breaks subagent tool calling — use separate models as workaround Structured data fields (1000+): Dedicated LLM channel vs vectorized field names? PollerCompletionQueue._handle_events BlockingIOError spam in LangGraph Cloud logs Parallel Nodes: how to manage failures or exceptions With too many fields, how should deepagents handle this properly? Inability to Determine the Breakpoint between s1 and s2 due to Current Windowing Logic Guarding tool calls against prompt injection / exfiltration Feature Discussion: Opt-In Recursive Long-Context Executor for LangGraph Persisting HITL payloads Multi-Agent Architecture Are dynamic tool lists allowed when using create_agent? Langgraph RemoteGraph How to make an image tool?
Proposal: Graph-wide default error handler for StateGraph (fallback for nodes without error_handler)
gouveags · 2026-05-12 · via LangChain Forum - Topics tagged python-help
Post body (copy/paste) Context I’m following up on an earlier GitHub issue: Original issue: More robust error…