Breadcrumb
Open-source LLM tracing for agent visibility
Breadcrumb launched on March 26, 2026 with 163 votes, #202 of 23,380 launches that month and more than 99% of that year's launches.
What it does
Breadcrumb 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.
Breadcrumb is embeddable LLM tracing for TypeScript apps. It drops into your backend, stores traces in your own Postgres, and gives you a dashboard you mount in your app. Your database, your deployment, your UI.
LLM tracing for TypeScript apps that installs like a library, not a service. Traces land in the database you already run, and the dashboard is a component you mount in your own app. import { breadcrumb } from " @breadcrumb-sh/core " ; import { postgres } from " @breadcrumb-sh/core/adapters " ; export const bc = breadcrumb ( { database : postgres ( process . env . DATABASE_URL ! ) , basePath : " /api/breadcrumb " , mcp : { hidePayloads : true }, // your agent reads traces, not prompts } ); Integrate in your stack. One instance, pointed at the database you already run, mounted in your app behind your own auth. Instrument. Pass bc.telemetry() to the AI SDK, and wrap everything around it in…from breadcrumb.sh
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