Langfuse
Open-source LLM engineering platform for tracing, prompt management and evaluations.
What it is
Langfuse is an open-source platform for building and monitoring LLM applications. It covers tracing, prompt management, evaluations, datasets and experiments, metrics dashboards and a playground. All product features are MIT licensed and it can be self-hosted or used as Langfuse Cloud. It also ships a CLI and an MCP server so coding agents can query traces and manage prompts.
Heads up: ClickHouse has acquired Langfuse, which stays open source and keeps running as the same product.
MCP server
What an AI agent can do with it
- Read: list prompts and query traces and observations
- Write: create and manage prompts
MCP docs · Verified 9 Oct 2026
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