Langfuse
Pull Langfuse traces and observations into your agent so you can debug LLM apps and monitor production agent behavior.
Overview
com.pulsemcp/langfuse is an MCP server for the Operate phase that queries Langfuse for LLM traces and observation analysis through your agent.
What is this MCP server?
- Langfuse observability MCP server v0.1.2 over stdio
- Trace retrieval and observation analysis tools for LLM runs
- Authenticates with LANGFUSE_SECRET_KEY and LANGFUSE_PUBLIC_KEY
- Configurable LANGFUSE_BASE_URL defaulting to https://cloud.langfuse.com
- Experimental PulseMCP package under pulsemcp/mcp-servers langfuse subfolder
- Server version 0.1.2
- 2 required secret environment variables plus optional LANGFUSE_BASE_URL
- Default API host https://cloud.langfuse.com
Community signal: 70 GitHub stars.
What problem does it solve?
Debugging agent and LLM issues in production is slow when traces live only in a separate observability dashboard.
Who is it for?
Solo builders already instrumenting with Langfuse who want MCP access from Claude Code or Cursor during incidents and reviews.
Skip if: Projects without Langfuse instrumentation or teams standardized on unrelated LLM analytics only.
What do I get? / Deliverables
Your agent can analyze Langfuse traces and observations inline while you fix prompts, tools, or retrieval code.
- MCP server wired to Langfuse cloud or self-hosted base URL
- Agent-readable trace and observation summaries for incidents
- Faster prompt and tool iteration tied to real production spans
Recommended MCP Servers
Journey fit
How it compares
Langfuse read/analysis MCP bridge, not a replacement for SDK instrumentation or a generic log tail skill.
Common Questions / FAQ
Who is com.pulsemcp/langfuse for?
Developers operating LLM and agent apps on Langfuse who want trace analysis inside MCP-capable coding agents.
When should I use com.pulsemcp/langfuse?
Use it when monitoring production agents, investigating failed traces, or reviewing observation details during ship and operate.
How do I add com.pulsemcp/langfuse to my agent?
Register npx -y langfuse-observability-mcp-server with LANGFUSE_SECRET_KEY, LANGFUSE_PUBLIC_KEY, and optional LANGFUSE_BASE_URL in MCP env.