Langfuse Observability

Overview

Langfuse 3.x is the open-source LLM observability platform for tracing, monitoring, evaluation, and prompt management. Unlike LangSmith (proprietary), Langfuse is self-hosted, free, and designed for production LLM applications.

When to use this skill:

• Setting up LLM observability from scratch
• Debugging slow or incorrect LLM responses
• Tracking token usage and costs per agent/user/session
• Managing prompts in production with versioning
• Evaluating LLM output quality with automated scoring
• Migrating from LangSmith to Langfuse