langfuse-observability

Langfuse observability plugin for Claude Code — captures and exports traces, spans, and session telemetry from Claude Code to Langfuse for LLM monitoring, debugging, and evaluation

Install

If the official marketplace isn’t added yet, run

Category: Monitoring
Author: Langfuse
GitHub: langfuse/claude-observability-plugin
Website: langfuse.com

Good for

Send Claude Code prompts, agent turns and tool calls to Langfuse
Track token usage and cost for each model generation
Debug and evaluate Claude Code sessions

Getting started

Make sure uv is on your PATH, or use Python 3.10+ with langfuse installed
Run /plugin install langfuse-observability@claude-plugins-official in Claude Code, then restart Claude Code
Use /plugin configure to enter LANGFUSE_PUBLIC_KEY and LANGFUSE_SECRET_KEY
Send a message and check the trace in Langfuse; if it fails, read ~/.claude/state/langfuse_hook.log

Before you install

Needs Langfuse API keys; without LANGFUSE_BASE_URL it sends to https://cloud.langfuse.com (EU region). Claude Desktop Chat mode is not traced.

Summarized by AI from the project docs; check the official docs before relying on it.

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