What Langfuse does
Langfuse is an open-source AI engineering platform for tracing, evaluating and iterating on LLM applications and agents. Its hierarchical traces capture every LLM call, tool invocation and retrieval step, and it also provides prompt management, datasets, experiments and evaluators using LLM-as-a-judge, heuristic functions or human review.
Why teams reach for it: Langfuse keeps tracing, prompt management, datasets, experiments and human annotation in one open-source platform a team can self-host, and its tracing is built on OpenTelemetry, so instrumentation is not tied to Langfuse's own SDK and the data can leave with the team.
How Langfuse compares
Fields the vendor doesn't document are left blank here rather than guessed — a blank means nothing verified, not a "no."
- Perspective
- Agent developer
- Instrumentation Method
- server SDK, OpenTelemetry
- Traces
- Yes
- Evaluations
- Yes
- Datasets
- Yes
How will you trace quality and operations?
Observability & evaluation tools track how well an MCP server is performing and help catch issues once it's live.