---
name: "tech-prompt-cache-byte-sensitive"
title: "Prompt cache is byte-sensitive"
description: "Any prefix byte change can bust LLM prompt cache"
type: "tech"
category: "agents"
tags: ["tech", "llm", "performance"]
related: ["[[project-open-managed-agents]]", "[[tech-ai-agent-stack]]"]
---
Prompt caching keys on exact prefix bytes. Unstable timestamps, random IDs, or reordered system text kill hit rates.

Related: [[project-open-managed-agents]], [[tech-ai-agent-stack]].