My MCP Server Got Rate-Limited After Auth. Here's the 5-Line Fix.

A Sentry MCP user reported it on March 18: "all API calls being rate-limited within a few minutes of auth." The OAuth handshake works fine. It's the calls after auth that quietly burn the budget, one runaway automation loop already cost a team $47,000 in eight hours. If you run an MCP server today, that's the bill you wake up to. Not a security breach. Not a leaked key. Just a polite agent doing what it was told, hammering your paid backend at machine speed because the token said it could. OAuth