Draw a cache boundary before you write code

The move: separate the world before you cache it. Prompt caching fails quietly when reusable and volatile text are interleaved. You can add cache controls, but the boundary keeps shifting. The practical fix is to classify prompt material by change rate. Static Stable instructions, tool definitions, answer rubrics, examples, and reference docs should change only when you intentionally release a new prompt version. This is the strongest cache candidate. Semi-static Account playbooks, policy updates, price sheets, and campaign briefs change on a known cadence. They may deserve their own segment or breakpoint so updates do not invalidate the core instructions.…

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