// what you'll learn
- Two parts of every prompt. the big stable prefix vs the tiny variable tail.
- The win. cached reads cost ~0.1× of normal input price — about 90% off — and they're faster.
- The one rule. the cached prefix must be byte-identical and in the same order: stable first, variable last.
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Start with MCP in one page — then caching, agents, and the rest.
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