{
  "schema_version": "1.0",
  "surface_type": "guide_answer",
  "guide_id": "cache-hit-rate-for-rag",
  "question": "How does cache hit rate change agent unit cost?",
  "canonical_url": "https://www.unitcostai.com/guides/cache-hit-rate-for-rag",
  "related_tool_url": "https://www.unitcostai.com/tools/ai-workflow-cost",
  "formula": "effective_cost_per_request = base_cost_per_request * (1 - cache_hit_rate)",
  "assumptions": [
    "Cache-hit requests avoid most generation and retrieval costs",
    "Hit rate is measured on production-like traffic",
    "Freshness constraints cap achievable hit rate"
  ],
  "example": "0.02 base cost with 0.4 cache hit rate gives 0.012 effective cost per request."
}