How far do you personalize?

I've been using Claude Code and other such tools for a while now and one of the most impactful customizations I've made is telling them how I think and how to communicate with me. For example, I put simple instructions in ~/.claude/CLAUDE.md that tell Claude that I want it to always lead with the conclusion then explain, that I'm prone to spending too long perfecting before shipping, and to be more aggressive in critiquing. That context will be superseded by any that contradicts it at the project level, but it means every new project I start has foundational context on how to work with and help me as the human.

I went through a process of asking Claude questions about what it knew about me and how I work, how I worked with it, etc. across many projects in Claude Desktop and Code, ran the same prompt with ChatGPT and Gemini (I use all three pretty extensively), then aggregated them and aggressively pruned to get a final instruction set based on the most accurate mirror of my actual usage I could manage. That's probably over the top, but was a fun experiment.

What if any personalization do you use, as in adjusting the tools to work better with you as the meat bag--err--human at the keyboard?

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