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Langfuse MCP

作者 langfuse · langfuse/mcp-server-langfuse

Manage Langfuse LLM-observability prompts from your agent.

Langfuse is open-source LLM observability and prompt management. This MCP lets Claude read prompt versions, fetch traces, and update prompt templates — useful for prompt engineers who want their assistant to actually touch the prompt store.

为什么要用

核心特性

实时演示

实际使用效果

langfuse-mcp.replay ▶ 就绪
0/0

安装

选择你的客户端

~/Library/Application Support/Claude/claude_desktop_config.json  · Windows: %APPDATA%\Claude\claude_desktop_config.json
{
  "mcpServers": {
    "langfuse-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@langfuse/mcp-server"
      ]
    }
  }
}

打开 Claude Desktop → Settings → Developer → Edit Config。保存后重启应用。

~/.cursor/mcp.json · .cursor/mcp.json
{
  "mcpServers": {
    "langfuse-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@langfuse/mcp-server"
      ]
    }
  }
}

Cursor 使用与 Claude Desktop 相同的 mcpServers 格式。项目级配置优先于全局。

VS Code → Cline → MCP Servers → Edit
{
  "mcpServers": {
    "langfuse-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@langfuse/mcp-server"
      ]
    }
  }
}

点击 Cline 侧栏中的 MCP Servers 图标,然后选 "Edit Configuration"。

~/.codeium/windsurf/mcp_config.json
{
  "mcpServers": {
    "langfuse-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@langfuse/mcp-server"
      ]
    }
  }
}

格式与 Claude Desktop 相同。重启 Windsurf 生效。

~/.continue/config.json
{
  "mcpServers": [
    {
      "name": "langfuse-mcp",
      "command": "npx",
      "args": [
        "-y",
        "@langfuse/mcp-server"
      ]
    }
  ]
}

Continue 使用服务器对象数组,而非映射。

~/.config/zed/settings.json
{
  "context_servers": {
    "langfuse-mcp": {
      "command": {
        "path": "npx",
        "args": [
          "-y",
          "@langfuse/mcp-server"
        ]
      }
    }
  }
}

加入 context_servers。Zed 保存后热重载。

claude mcp add langfuse-mcp -- npx -y @langfuse/mcp-server

一行命令搞定。用 claude mcp list 验证,claude mcp remove 卸载。

使用场景

实战用法: Langfuse MCP

Iterate on a production prompt with traceable versions

👤 Prompt engineers ⏱ ~15 min intermediate

何时使用: You want to A/B a prompt without leaving the chat.

前置条件
  • Server/skill installed and authenticated — See repo README
步骤
  1. Pull the current production prompt
    Get the 'support-triage' prompt labeled 'production' from Langfuse.✓ 已复制
    → Current prompt text + version number
  2. Test a tweak
    Create version with my proposed change labeled 'staging'. Don't promote.✓ 已复制
    → New version saved, 'production' label untouched

结果: Versioned, reviewable prompt history.

注意事项
  • Labels are mutable — Labels are mutable — moving 'production' to a new version is an instant rollout. Confirm before relabel.
搭配使用: filesystem

组合

与其他 MCP 搭配,撬动十倍杠杆

langfuse-mcp + filesystem

Pair with filesystem for complementary capabilities

Use this server together with filesystem to complete a multi-step task.✓ 已复制

工具

此 MCP 暴露的能力

工具输入参数何时调用成本
get_prompt name, version|label Retrieve a prompt for inspection or copying 1 API call
create_prompt name, prompt_text, labels Save a new version 1 API call
list_traces user_id|session_id, limit Debug a specific user/session 1 API call

成本与限制

运行它的成本

API 配额
See provider docs for rate limits
每次调用 Token 数
Varies by tool
费用
See repo README for pricing details
提示
Cache tool results and avoid repeated identical calls.

安全

权限、密钥、影响范围

凭据存储: Use environment variables; never commit secrets
数据出站: Tool calls go to the provider's API as documented

故障排查

常见错误与修复

401 Unauthorized

Create a project in Langfuse, generate a key pair, set LANGFUSE_PUBLIC_KEY and LANGFUSE_SECRET_KEY.

验证: get_prompt on a known name works
prompt not found

Prompts are project-scoped. Confirm LANGFUSE_HOST and that the prompt exists in the target project.

验证: Open the Langfuse UI for that project

替代方案

Langfuse MCP 对比其他方案

替代方案何时用它替代权衡
comet-ml/opik-mcpYou already use Opik for tracingSimilar feature set; different vendor

更多

资源

📖 阅读 GitHub 上的官方 README

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