Verified65% confidenceSolutionExact time
The general principle for achieving cache hits is to keep the prefix of the request context as stable as possible, placing fixed content such as system prompts and tool definitions at the very front, with per-turn user input appended at the end.
3
Sources
65%
Confidence
Long-term
Relevance
7/20/2026
First Seen
Sources
Related Claims
UnverifiedTo maximize prefix reuse, stable, unchanging content (system prompts, tool schemas) should be placed at the beginning of the prompt, with variable content placed at the end.77% similarUnverifiedTo maximize cache hit rate, stable content (system prompts, file contents) should be placed at the prefix of the prompt, with dynamic content appended at the end77% similarUnverifiedCore techniques of context engineering include separating stable system prompts from dynamic content, compressing or summarizing historical turns, and trimming tool return values.76% similarUnverifiedPreferences, background, and commonly used formats can be codified through system prompts or custom instructions, avoiding the need to repeat them every time.76% similarUnverified自定义指令本质上是一种系统提示词（System Prompt）的持久化机制，将用户规则注入系统提示词层75% similar
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