An Agent Skill Enforcing 1983 Aerospace Writing Rules Cuts Documentation Violations 72.9% Across Six Claude Models

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SimpleEnglish is an Agent Skill that forces LLM-written docs into ASD-STE100 Simplified Technical English — the 53-rule controlled language aviation maintenance has used since 1983 (max 20 words per instruction, active voice only, simple tenses, no hedging modals, conditions before commands). Testing across six Claude models showed a 72.9% reduction in STE violations per 100 words with the skill enabled. The repo sits at 817 stars, installs via `npx skills add AminBlg/SimpleEnglish`, and works across roughly 25 agent frameworks including Claude Code, Cursor, VS Code Copilot and Gemini CLI; the HN thread hit 309 points and 113 comments.