Rate-Limiting and Backoff Patterns for MCP Servers That Don't Fall Over Under Load
A team I talked with last quarter had an agent stuck in a loop calling the same tool for eight hours. By the time someone noticed, it had run up a five-figure cloud bill. That's not a hypothetical — a runaway automation loop making 127,000 API calls in roughly 8 hours has been reported to cost around $47,000 in a single incident. No rate limiter, no circuit breaker, nothing between the agent and…
A team's agent was caught in a loop calling the same tool for eight hours, leading to a five-figure cloud bill. This incident highlights the importance of implementing rate limiting and retry/backoff patterns for MCP servers to prevent costly issues. The article focuses on designing rate limiting and retry/backoff for MCP servers to stop stuck agents quickly instead of expensively, without covering OAuth token refresh or full observability setup.
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