K Retrostash 0.0.13: annotation-driven caching for Retrofit, OkHttp, and Ktor on Kotlin Multiplatform. Stock OkHttp cache only handles GET. POST queries (GraphQL, search, anything with a request body) bypass it. And no client gives you mutation-driven invalidation — when a POST mutates the server, you flush specific cached entries by hand. Retrostash fixes both. Annotate the function, declare which mutations invalidate which queries, get a typed cache that survives across Retrofit, OkHttp, and Ktor. Targets: Android, JVM, iOS, wasmJs. Maven Central + Swift Package Manager. Repo: github.com/logickoder/retrostash Docs: logickoder.dev/retrostash Tell me what breaks.