tl;dr: An open-source agent skill forces LLMs to write documentation following ASD-STE100 Simplified Technical English, the controlled language aerospace has used since 1983 (max 20 words per sentence, one word per meaning, active voice, no hedging modals). It installs via `npx skills add` and works with Claude Code, Cursor, Copilot, Gemini CLI, and others via the Agent Skills standard. Benchmarks across 6 Claude models show a 72.9% average reduction in STE violations and shorter outputs; it's explicitly scoped to docs, errors, runbooks, and incident reports—not marketing copy.