{
  "status": "Illustrative acceptance plan, not an executable test suite or observed production result",
  "topic": "LLM fallback routing for production apps",
  "date": "2026-11-04",
  "sourceArticle": "https://aptixlabs.com/insights/llm-fallback-routing",
  "setup": [
    "Use synthetic accounts and records",
    "Record the environment and implementation version",
    "Agree the expected product contract before testing"
  ],
  "reviewSequence": [
    "Define explicit routing triggers and compatible capabilities",
    "Build a shared task and output evaluation set",
    "Track accepted results by route and provider"
  ],
  "cases": [
    {
      "id": "1",
      "condition": "Primary provider is unavailable",
      "expectedBehavior": "Only a compatible route is selected",
      "observedBehavior": null,
      "status": "not_run"
    },
    {
      "id": "2",
      "condition": "Fallback returns a different schema",
      "expectedBehavior": "Validation catches the mismatch",
      "observedBehavior": null,
      "status": "not_run"
    },
    {
      "id": "3",
      "condition": "A previous tool write already succeeded",
      "expectedBehavior": "The fallback does not execute it again",
      "observedBehavior": null,
      "status": "not_run"
    }
  ],
  "tradeoff": "Fallback adds configuration and testing overhead. A narrower product that admits temporary unavailability may be preferable to an untested chain of providers for sensitive workflows."
}