Langsmith Mcp Server

🦜🛠️ LangSmith MCP Server


[](https://opensource.org/licenses/MIT) [](https://www.python.org/downloads/release/python-3100/)

A production-ready [Model Context Protocol](https://modelcontextprotocol.io/introduction) (MCP) server that provides seamless integration with the [LangSmith](https://smith.langchain.com) observability platform. This server enables language models to fetch conversation history, prompts, runs and traces, datasets, experiments, and billing usage from LangSmith.

📋 Example Use Cases

The server enables powerful capabilities including:

• 💬 Conversation History: "Fetch the history of my conversation from thread 'thread-123' in project 'my-chatbot'" (paginated by character budget)
• 📚 Prompt Management: "Get all public prompts in my workspace" / "Pull the template for the 'legal-case-summarizer' prompt"
• 🔍 Traces & Runs: "Fetch the latest 10 root runs from project 'alpha'" / "Get all runs for trace <uuid> (page 2 of 5)"
• 📊 Datasets: "List datasets of type chat" / "Read examples from dataset 'customer-support-qa'"
• 🧪 Experiments: "List experiments for dataset 'my-eval-set' with latency and cost metrics"
• 📈 Billing: "Get billing usage for September 2025"

🚀 Quickstart

A **hosted version** of the LangSmith MCP Server is available over HTTP-streamable transport, so you can connect without running the server yourself:

• URL: https://langsmith-mcp-server.onrender.com/mcp
• Hosting: Render, built from this public repo using the project's Dockerfile.

Use it like any HTTP-streamable MCP server: point your client at the URL and send your LangSmith API key in the `LANGSMITH-API-KEY` header. No local in