When writing complex software, it now makes sense to make custom devtools.

The custom devtools lets the human peer into the innards of the system.

The LLMs understand it already, but humans are not machines.

Custom devtools used to be unthinkably expensive, reserved only for the most well-funded or must-not-fail projects.

But now you can do it for even throwaway projects.

It gives you leverage, because it allows you to peer into the innards and find high-leverage mistakes.