MCP

The MCP server gives your LLM read-only access to your trace data. Connect it to Claude, Cursor, or any MCP-compatible client to debug and improve your prompts from real production data.

Create an MCP key

Go to your user settings and create a new MCP key. Each key grants read-only access to traces across all your projects.

Install

claude mcp add --transport http breadcrumb https://app.breadcrumb.sh/mcp

Replace app.breadcrumb.sh with your instance domain if self-hosting.

What your LLM can do

• Read traces and spans - browse, filter, and inspect the full content of any trace including prompts, completions, and metadata
• Find problems - surface the slowest, most expensive, or highest-token traces across your projects
• Run queries - execute read-only SQL against your trace data for custom analysis
• Fix your code - read what actually happened in production and rewrite prompts or logic based on real data