MCP Tools Keep Timing Out? The Async Pattern That Fixes 424 Errors

MCP tools calling external APIs hang for minutes, killing AI agents with 424 errors. The async handleId pattern fixes this: start_long_job returns a job ID immediately, check_job_status polls results.

MCPAsyncTimeoutFastMCP

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Speaker

Elizabeth Fuentes Leone

Developer Advocate

Resources

Why AI Agents Fail: 3 Failure Modes That Cost You Tokens and Time

Blog post with the MCP timeout section and async pattern

Demo: MCP Timeout Fix

Async handleId pattern with FastMCP

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