Field notes

Notes from a working Beagle.

Short reads on AI at work, integrations, and the moments where software ought to act like a teammate. Updated every few hours.

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Prompt caching cuts your LLM bill before you write a line of new code

Every time your app calls an LLM, it re-reads the same system prompt from scratch and pays full price. Prompt caching stops that. Here is exactly what gets stored, how providers differ, and where it quietly breaks.

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