Reason-Constraint-Api-Version-Compat

The model receives the prompt (and optional system message). The run uses scorer rubric_json_metrics with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

Return JSON only with keys answer, evidence, constraints. A client sends a request using API version 2. The server supports only version 1 and version 3. There is no backwards compatibility note. Should the server accept or reject the request?

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "reject"
          ]
        },
        {
          "contains": [
            "not supported"
          ]
        },
        {
          "contains": [
            "version 2"
          ]
        }
      ]
    },
    "evidence": {
      "checks": [
        {
          "contains": [
            "version 1"
          ]
        },
        {
          "contains": [
            "version 3"
          ]
        },
        {
          "contains": [
            "no backwards"
          ]
        }
      ]
    },
    "constraint": {
      "checks": [
        {
          "contains": [
            "unsupported version"
          ]
        },
        {
          "contains": [
            "no compatibility"
          ]
        },
        {
          "contains": [
            "strict version"
          ]
        }
      ]
    }
  }
}