TL;DR. @llm-ports 0.1.0-alpha.19 ships a typed, provider-neutral surface for prompt caching across Anthropic, OpenAI, and Gemini. One optional cacheControl field on every request, four modes. Plus a BREAKING field rename: cost.cacheDiscountUSD → cost.cacheSavingsUSD. This is the third of four shape-locks before beta.0 on 2026-06-30.

Install: npm...