Breadcrumb: Open-Source LLM Tracing Tool for AI Agent Monitoring
By
Joshua Knauber
Tired, dry, slightly forgotten on the back of the tray.
Summary
Breadcrumb is an open-source, self-hosted LLM tracing tool designed for developers to monitor and debug AI agents. It provides visibility into agent behavior with minimal setup, automatically detecting issues like incorrect tool calls, agent loops, and cost spikes. The tool allows users to query trace data in plain English and receive visual charts in response.
Key quotes
· 3 pulledBreadcrumb is the Plausible of LLM tracing. Self-hosted, open source, and built for developers who just want to understand what their agents are actually doing without the enterprise bloat of LangFuse or LangSmith.
Three lines to get your app traced. An LLM watches every trace and automatically flags issues: wrong tool calls, looping agents, oversized models and cost spikes, all before you even know something's wrong.
Ask questions about your traces in plain English and get charts back.
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