Langfuse

MCP Server to connect to langfuse for usage & cost analysis.

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Language

7 months ago

First Indexed

3 months ago

Catalog Refreshed

Documentation & install

Readme and setup notes from the catalogue, plus a client-ready config you can copy for your MCP host.

Installation

Add the following to your MCP client configuration file.

Configuration

View docs

{
  "mcpServers": {
    "therealsachin-langfuse-mcp": {
      "command": "npx",
      "args": [
        "@therealsachin/langfuse-mcp"
      ],
      "env": {
        "LANGFUSE_BASEURL": "https://us.cloud.langfuse.com",
        "LANGFUSE_MCP_MODE": "readwrite",
        "LANGFUSE_PUBLIC_KEY": "pk-lf-xxx",
        "LANGFUSE_SECRET_KEY": "sk-lf-xxx"
      }
    }
  }
}

Available tools

list_projects

List all configured Langfuse projects

project_overview

Get cost, tokens, and trace summary for a project

usage_by_model

Break down usage and cost by AI model

usage_by_service

Analyze usage by service/feature tag

top_expensive_traces

Identify the most expensive traces

get_trace_detail

Retrieve detailed information for a specific trace

get_projects

Alias for list_projects to fetch available Langfuse projects

get_metrics

Query aggregated metrics with flexible filtering

get_traces

Fetch traces with comprehensive filtering options

get_observations

Get LLM generations and spans with details and filtering

get_cost_analysis

Cost breakdowns by model/user/daily trends

get_daily_metrics

Daily usage trends and averages

get_observation_detail

Detailed information about a specific observation

get_health_status

Monitor Langfuse system health and status

list_models

List all AI models available in the project

get_model_detail

Get detailed information about a specific AI model

list_prompts

List all prompt templates with filtering and pagination

get_prompt_detail

Get detailed information about a specific prompt template