Agent Breadcrumbs

Agent Breadcrumbs (Breadcrumb) is an open-source, self-hosted LLM tracing tool that gives developers visibility into what their AI agents are actually doing at runtime. It deploys an AI-powered monitoring agent that reads every trace and automatically surfaces issues such as silent failures, agent loops, wrong tool calls, hallucinations, context loss, and cost spikes. It also includes a natural-language explore tab where users can ask questions about their traces and receive real charts in response. Built on Clickhouse for scalable trace storage, it integrates out of the box with the Vercel AI SDK via a TypeScript SDK.