This strips prompts down to pure semantic content by yanking out articles, auxiliary verbs, and grammatical scaffolding. It keeps nouns, main verbs, adjectives, numbers, and anything that actually changes meaning, while aggressively removing "the", "is", "was", "for", and other predictable words. Useful when you're hitting context limits and need to cram more information into fewer tokens without losing what matters. The compression is surprisingly readable once you see a few examples. It won't save you from genuinely verbose prompts, but it does squeeze out the grammatical air between words. Think of it as a last resort before you start cutting actual content.
npx skills add https://github.com/jwiegley/claude-prompts --skill caveman