#37MCP server

LangSmith MCP Server

Opens LangSmith traces, prompts, datasets and experiments to an agent.

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Rank

#37

of 445 · by weekly downloads

Weekly downloads

35K

npm + PyPI, last 7 days

Add it to your client

Official

Install

uvx langsmith-mcp-server

mcpServers

{
  "mcpServers": {
    "langsmith-mcp": {
      "command": "uvx",
      "args": [
        "langsmith-mcp-server"
      ]
    }
  }
}

Transport: both
Runtime: Python
Auth: Required
License: MIT

Tools

fetch_runslist_projectsget_thread_historylist_promptsget_prompt_by_namepush_promptlist_datasetsread_datasetcreate_datasetlist_examplesread_exampleupdate_examples+3

Repositoryhttps://github.com/langchain-ai/langsmith-mcp-server

LangSmith MCP Server gives agents read and write access to your LangSmith workspace, including run history, traces, prompts, datasets, and experiment results. It runs either locally via stdio using uvx or over HTTP for self-hosted deployments. LangChain now recommends the hosted remote endpoint for new setups.

Highlights

Access run history and conversation threads
Read and write prompt versions and dataset examples
Query experiment results and billing usage
Local stdio or HTTP deployment options
Full read/write workspace access for agents

Designed for LangChain users who want agents to explore and analyze their LangSmith experiments programmatically. Free to use; self-hosted deployments supported alongside the hosted remote endpoint.

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