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Langfuse

Open-source LLM engineering platform: traces, evals, and prompts

monitoringobservabilityMCPCLI

Collect traces, scores, and metadata for LLM and agent runs with dashboards, datasets, and prompt versioning. Teams wire Langfuse into agent loops to debug failures, compare models, and measure quality in production.

Overview

Authapi key
PricingFree tier available · $0/month
SDKstypescript, python
OpenAPIYes
MCP SupportYes
Langfuse — Agent Tool — 4agent