Claude has a tendency to reinvent the wheel heavily.

It'll create a massive bespoke class to do something that is already in the stdlib.

But if there's a pattern of already using stdlib functions, it can copy that easily.

Basically, to get the best out Claude (or any of the other agents) it if it is possible to tell it about something ahead of time time then it is generally wise to, be that in seed skeleton code, comments, CLAUDE.md etc