Last week I watched a breakdown of how Andrej Karpathy uses Claude Code. One thing that stood out for me: he asks claude to explain things in ASD-STE100, Simplified Technical English. STE is the controlled language that aircraft maintenance manuals are written in. Short sentences, active voice, one word for one meaning. It exists so a mechanic cannot misread an instruction. I tested it in my own Claude Code sessions for the last few days. The replies got shorter and easier to act on. The answer comes first, steps come as a list, and a risk comes in one line at the top. Less scrolling, less re-reading, and fewer moments where I had to ask "so what do I do now?" Yesterday I made it permanent. If you want to try it out, paste this prompt into Claude and it does it for you: --- From now on, reply to me in ASD-STE100 (Simplified Technical English). Save this as a permanent rule in my instructions (CLAUDE.md in Claude Code), so it applies in every session, then show me the change: "Replies to me use ASD-STE100 (Simplified Technical English). Answer first. Sentences of 20 words or fewer, active voice, no filler or hedging. Steps and options as lists. Instructions in command form. If there is a risk, put it first, in one line. One term for one thing. Keep file names, commands and code exactly as they are. No summary at the end. Use it only in replies to me, not in files you write: code, comments, docs, emails or posts." --- Keep that last sentence. Your mails, posts and docs should still sound like you, so STE stays in the replies. In the Claude app, Claude cannot save its own settings. Ask it for the rule, then paste it into Settings > Profile > personal preferences. Run your next session and tell me below if the replies feel better or too blunt.