{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://adcontextprotocol.org/schemas/3.2.5/core/vendor-metric-optimization-supported-metric.json",
  "title": "Vendor Metric Optimization Supported Metric",
  "description": "One vendor-defined metric that a product can optimize toward. Identified by the tuple `(vendor, metric_id)` plus the supported target kinds for optimization goals.",
  "type": "object",
  "properties": {
    "vendor": {
      "$ref": "https://adcontextprotocol.org/schemas/3.2.5/core/brand-ref.json",
      "description": "Vendor that defines and computes this metric. The vendor's `brand.json` is the discovery anchor for the measurement agent (entry with `type: 'measurement'` in the `agents[]` array); the metric's definition, methodology, and unit live at that agent's `get_adcp_capabilities.measurement.metrics[]` and are not duplicated inline here. Same shape as the `vendor` field on `reporting_capabilities.vendor_metrics` for symmetry across optimization and reporting capability declarations."
    },
    "metric_id": {
      "$ref": "https://adcontextprotocol.org/schemas/3.2.5/core/vendor-metric-id.json",
      "description": "Identifier for the metric within the vendor's vocabulary (e.g., `attention_score`, `attention_seconds`, `gco2e_per_impression`, `awareness_lift`). MUST be present in the vendor's published `measurement.metrics[]` catalog."
    },
    "supported_targets": {
      "type": "array",
      "description": "Target kinds available for `vendor_metric` goals against this `(vendor, metric_id)` pair. Values match `target.kind` on the optimization goal. `cost_per` — target cost per metric unit (e.g., $0.05 per attention-second). `threshold_rate` — minimum per-impression value (e.g., attention_score ≥ 70). Only these target kinds are accepted — goals with unlisted target kinds will be rejected. A goal without a target implicitly maximizes the metric within budget — no declaration needed for that mode. When omitted, buyers can still set target-less vendor_metric goals.",
      "uniqueItems": true,
      "items": {
        "type": "string",
        "enum": [
          "cost_per",
          "threshold_rate"
        ]
      }
    }
  },
  "required": [
    "vendor",
    "metric_id"
  ],
  "additionalProperties": false
}