MCP Academy · Lesson

Async Tools That Don't Block

Use async I/O to serve many calls at once.

One Slow Tool, Everyone Waits

If a tool does slow work synchronously, it blocks the whole server, so every other call has to wait its turn. ⏳

Most Slowness Is Waiting

A tool that calls a database or API spends most of its time on I/O, just waiting for a reply rather than using the CPU.

All lessons in this course

  1. Async Tools That Don't Block
  2. Concurrency & Backpressure
  3. Trim Token-Heavy Results
  4. Scale Horizontally with Sessions
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