Langfuse Observability Skill

Query Langfuse observability data via REST API to debug agent runs, analyze LLM costs, and inspect prompt versions. This skill complements the Langfuse Prompt MCP (built-in) which handles prompt CRUD — this skill covers everything else.

Prerequisites

Authentication: All API calls require HTTP Basic Auth.

• Username: LANGFUSE_PUBLIC_KEY (e.g., pk-lf-...)
• Password: LANGFUSE_SECRET_KEY (e.g., sk-lf-...)

Base URL: Read from .env:

grep LANGFUSE_BASE_URL .env  # e.g., http://localhost:4300

Quick connectivity check: