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LangChain Forum - Latest topics

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 FileSystem middleware Using ChatSnowflake with agents Built llmsessioncontract on AgentMiddleware: runtime enforcement of tool-call protocols — feedback wanted DeltaChannelHistory not found in langgraph-api:3.12 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 are you validating LangChain agent output before it executes shell commands? Cross-site pattern pool for production agent failures — looking for 5 pilot teams (open spec, CC-BY-4.0) Metadata filter not filtering for alerts Using custom MCP servers with assistants How to use tool calling using ChatLlamaCpp and Gemma 4 E4B with create_agent? CLI - No Longer Sending traces to Langsmith Connecting the Slack integration fails with invalid_team_for_non_distributed_app 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 Modal Inference Trouble understanding and editing experiment summary evaluators feedbacks 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 Ombre — open source security and audit layer for LangChain apps Should interrupt() be split into two primitives — one for human input, one for s2s data fetching? Unable to delete runs from annotation queue First Bedrock call after idle is slow on TTFT (follow-ups in the same trace are fast)
No cost displayed in LangSmith when using LiteLLM + LangG...
@pawel-tward · 2026-04-17 · via LangChain Forum - Latest topics

Hey, I’m using ChatLiteLLMRouter with LangGraph. Token count is tracked correctly in LangSmith, but cost is never shown - for any model (OpenAI, Anthropic, Gemini). I tried adding langsmith callback as described here: import litellm from langchain_litellm import ChatLiteLLMRouter litellm.success_callback = ["langsmith"] llm = ChatLiteLLMRouter( # then use `llm` in my graph router=litellm_router, model="heavy", temperature=0, streaming=True, ) This does show tokens + cost, but cr...