Langfuse Observability

Agent Zero plugin for LLM observability via Langfuse.

Features

• Tracing — Automatic tracing of LLM calls, tool executions, and agent interactions
• Trace Viewer — Browse and inspect traces from the Agent Zero sidebar
• Chat Forking — Fork any conversation at any point to explore alternatives
• Prompt Lab — Test and refine prompts with judge-based evaluation
• Split View — Side-by-side comparison of chat responses

Installation

Clone or download this repo into your Agent Zero plugins directory:

git clone <repo-url> /path/to/agent-zero/usr/plugins/langfuse-observability

Configuration

Configure via the Agent Zero settings UI (Agent tab > Observability section), or set environment variables:

• LANGFUSE_PUBLIC_KEY — Your Langfuse project public key
• LANGFUSE_SECRET_KEY — Your Langfuse project secret key
• LANGFUSE_HOST — Langfuse instance URL (default: https://cloud.langfuse.com)

Requirements

The langfuse Python package is auto-installed on first use.