Langfuse Docs MCP: what works in Claude, ChatGPT, Cursor, and Grok Bot
Langfuse docs remote MCP server: search docs and read pages for the open-source LLM observability platform. No sign-in needed.
Registry name: (v)
Set it up
URL https://langfuse.com/api/mcp. No sign-in. Paste the URL and it connects. Copy-paste setup: Claude | Claude Code | Cursor | VS Code | ChatGPT
Status grid
| App | Status | Date tested |
|---|---|---|
| Claude | Untested | Not yet tested |
| ChatGPT | Untested | Not yet tested |
| Cursor | Untested | Not yet tested |
| Grok Bot | Untested | Not yet tested |
| MCP Inspector (reference client) | Untested | Not yet tested |
| MCP TypeScript SDK (reference client) | Partial | Fri Oct 16 2026 |
Hands-on test results
| App | Task | Result | Time | Detail | Date tested |
|---|---|---|---|---|---|
| MCP TypeScript SDK (reference client) | connect (no auth) | Works | 485 ms | Connected without sign-in in 485 ms. | Oct 16, 2026, 4:46 PM CT |
| MCP TypeScript SDK (reference client) | list tools | Works | 192 ms | 4 tools: submitFeedback, searchLangfuseDocs, getLangfuseDocsPage, getLangfuseOverview. | Oct 16, 2026, 4:46 PM CT |
| MCP TypeScript SDK (reference client) | search docs ("trace sessions") | Works | 2347 ms | searchLangfuseDocs: about 79 KB returned. "{"content": [{"type": "document", "record_type": "documentation", "url": "https://langfuse.com/docs/observability/data-model", "title": "Cor" | Oct 16, 2026, 4:46 PM CT |
| MCP TypeScript SDK (reference client) | get a docs page (/docs/observability/overview) | Works | 154 ms | getLangfuseDocsPage: about 6 KB returned. "--- title: "Overview" seoTitle: "LLM Observability & Application Tracing (Open Source)" description: "Open source application tracing and ob" | Oct 16, 2026, 4:46 PM CT |
| MCP TypeScript SDK (reference client) | get overview | Works | 126 ms | getLangfuseOverview: about 17 KB returned. "# Langfuse > Langfuse is an **open-source AI engineering platform** ([GitHub](https://github.com/langfuse/langfuse)) that helps teams collab" | Oct 16, 2026, 4:46 PM CT |
| MCP TypeScript SDK (reference client) | search with nonsense query | Partial | 4736 ms | searchLangfuseDocs: about 70 KB returned. "{"content": [{"type": "document", "record_type": "site", "url": "https://github.com/langfuse/langfuse-k8s/blob/main/README.md", "title": "la" | Oct 16, 2026, 4:46 PM CT |
| MCP TypeScript SDK (reference client) | error handling (number as query) | Works | 226 ms | Protocol error: MCP error -32602: MCP error -32602: Invalid arguments for tool searchLangfuseDocs: [ { "code": "invalid_type", "expected": "string", "received": "number", "path | Oct 16, 2026, 4:46 PM CT |
Oct 16, 2026, 4:46 PM CT, MCP TypeScript SDK (reference client): Scripted client using the official MCP TypeScript SDK v1.32.1 against https://langfuse.com/api/mcp (Streamable HTTP, protocol 2025-06-18). No sign-in needed. Server mcp-typescript server on vercel v0.1.0. Read-only server, so no create task. 6 of 7 tasks passed.
Automated handshake
No public remote endpoint to check (local or package-only server).
Gotchas
- MCP TypeScript SDK (reference client): Search results are large (about 79 KB for one query).
- MCP TypeScript SDK (reference client): getLangfuseDocsPage needs a current path. An older path (/docs/tracing) returned a 404 error in our first run.
- MCP TypeScript SDK (reference client): A nonsense query took about 5 s and returned about 70 KB of loosely related results.
Errors and fixes
- MCP tool results too large: context window blown by one call
- MCP search returns results for nonsense queries
FAQ
Does the Langfuse Docs MCP server work?
In our hands-on test on Oct 16, 2026, 6 of 7 tasks passed. Main gotcha: Search results are large (about 79 KB for one query).
What is the Langfuse Docs MCP server URL?
https://langfuse.com/api/mcp (Streamable HTTP).
Does the Langfuse Docs MCP server need sign-in?
No sign-in. Paste the URL and it connects.
How do I add the Langfuse Docs MCP server to Claude, Cursor, VS Code or ChatGPT?
Follow our copy-paste setup guides: https://connectorreport.com/c/langfuse-docs/setup/claude https://connectorreport.com/c/langfuse-docs/setup/claude-code https://connectorreport.com/c/langfuse-docs/setup/cursor https://connectorreport.com/c/langfuse-docs/setup/vscode https://connectorreport.com/c/langfuse-docs/setup/chatgpt
What errors does the Langfuse Docs MCP server give?
MCP tool results too large: context window blown by one call. MCP search returns results for nonsense queries.
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