# Lydia Hallie Lydia Hallie works at [[Anthropic]] in developer relations and education for [[Claude Code]]. On 2026-09-22, she shared that switching [[Claude Code effort levels|effort]] mid-session on [[Claude Opus 5.5]] doesn't break the [[Claude Code Prompt Caching|prompt cache]] (requires Claude Code v2.1.280+). On 2026-10-02, she published a video walkthrough of [[Claude Code Mods]], describing them as "really just plugins with a few special functions that let your code run inside Claude Code, like middleware". ## Quotes <!-- QueryToSerialize: LIST FROM #type/quote AND [[Lydia Hallie]] WHERE public_note = true SORT file.name ASC --> ## Books <!-- QueryToSerialize: LIST FROM #type/book AND [[Lydia Hallie]] WHERE public_note = true SORT file.name ASC --> ## Related - [[Anthropic]] - [[Claude Code]] - [[Claude Code Mods]] - [[Claude Opus 5.5]] ## References - https://x.com/lydiahallie - https://x.com/lydiahallie/status/2106127556491821499