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Most production LLM apps start with one giant system prompt: safety rules, product persona, tool instructions, and tenant policy jammed into a single string. That works until legal updates the refusal policy, product changes the tone, and engineering adds three tools in the same week. Suddenly nobody knows which copy of the prompt is live, and a canary becomes a full rewrite. Image: mikemacmarketing / photo on flickr via Wikimedia Commons (CC BY 2.0) Image: Uliana Bakhtina via Wikimedia Commons (CC BY-SA 4.0) Modular system prompt assembly treats the system message as a composed document. You keep small, versioned sections in a library, pick the ones a request needs, and concatenate them in a fixed order with clear separators. The model still sees one system message. Your team sees editable fragments you can test and roll out independently. Why a monolith prompt breaks in production A single unbounded string creates three operational problems. Change couplin...