Claude is very resistant to instructions. I've been cultivating my own minimal skill to tame it for a couple months: https://github.com/ricardobeat/skills/tree/main/human

The key sentences to get rid of claude-isms so far:

- say what you have to say and stop

- [no] document-structure signposts

- [no] historical remarks that only warn about past states

- don't attribute agency to things

- never narrate your own changes, fixes, defects from the past, or what the code used to do

It works 100% of the time for other models, 70-80% for Claude, but already makes a big difference.