Advanced8 min

LangSmith MCP Server

Access your LangSmith workspace via Model Context Protocol — query traces, manage prompts, run experiments, and monitor billing from any MCP-compatible client.

Quick Reference

→The hosted MCP server is available at https://langsmith-mcp-server.onrender.com/mcp — no deployment needed
→Provides tools for traces, datasets, experiments, prompts, conversation history, and billing
→Uses character-based pagination for large result sets — pass start_char and char_limit parameters
→Self-host via Docker for private deployments or to customize tool access
→A TypeScript community port exists for Node.js-native environments

MCP for LangSmith

The LangSmith MCP Server exposes your LangSmith workspace as a set of tools accessible via the Model Context Protocol. Any MCP client — Claude Desktop, Cursor, VS Code with Copilot, or custom agents — can connect and interact with your traces, datasets, prompts, and experiments programmatically. Instead of switching to the LangSmith UI, you query your observability data directly from your development environment.

Hosted vs self-hosted

LangChain provides a hosted version at langsmith-mcp-server.onrender.com/mcp that requires only your API key. For teams with compliance requirements or custom access controls, the server can be self-hosted via Docker with the official image.

Claude Desktop configuration for the hosted MCP server

Available Tools

Tool Category	Tools	Description
Traces	list_traces, get_trace, search_traces	Query and inspect production traces with filters
Datasets	list_datasets, get_dataset, create_dataset	Browse and manage evaluation datasets
Experiments	list_experiments, get_experiment_results	Review experiment scores and comparisons
Prompts	list_prompts, get_prompt, create_prompt	Manage prompt versions in the LangSmith Hub
Conversation History	list_sessions, get_session_messages	Retrieve conversation threads by session
Billing	get_usage, get_billing_info	Monitor API usage, costs, and plan limits

Self-Hosted Docker Deployment

For teams that need to self-host — whether for compliance, VPC isolation, or custom tool restrictions — the LangSmith MCP Server is available as a Docker image. You provide your API key as an environment variable and expose the MCP endpoint on your chosen port.

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