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Making Claude Talk Like a Human: A Plain-English Standard From Aircraft Maintenance Manuals

Claude stopped talking like a human starting with 4.7, and I thought my English just wasn't good enough — until Reddit showed me native speakers complaining too. So I turned ASD-STE100, the simplified-English standard used in aircraft maintenance manuals, into a skill, and now I can finally understand its English.

I was complaining a while back that Claude stopped talking like a human starting with 4.7. For a moment I thought my English just wasn’t good enough, but then I hopped on Reddit and found native speakers complaining about it too.

But have you heard of ASD-STE100? It’s an internationally used simplified-English standard, originally built for aircraft maintenance manuals, and the point is to let non-native speakers clearly understand the content of English technical documents. Simplified grammar, controlled vocabulary, so readers with a limited word count don’t get confused.

Here’s an example:

The valve should be rotated and tested before continuing.

Gets rewritten into:

Turn the valve. Do a test of the valve. Continue the procedure.

So I turned it into a skill, and every time Claude starts showing off its vocabulary again I push it to fall in line. Ever since then, I can finally understand its English.

https://github.com/danyuchn/asd-ste100-skill

Postscript: A Month Later, Same Problem

The moment I finished typing a certain prompt, I felt an endless wave of exasperation. Claude, once the model with the best writing chops, has now become the worst offender for not talking like a human. I have to ask Gemini to fix the tone for me these days, and I have to warn it not to change it back.


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