{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/merge/refs/heads/main/json-structure/gateway-response-structure.json",
  "name": "GatewayResponse",
  "description": "An LLM response routed through Merge Gateway with vendor selection metadata.",
  "type": "object",
  "properties": {
    "id": { "type": "string" },
    "model": { "type": "string" },
    "vendor": { "type": "string" },
    "provider": { "type": "string" },
    "created_at": { "type": "datetime" },
    "output": { "type": "array", "items": { "type": "object" } },
    "usage": {
      "type": "object",
      "properties": {
        "input_tokens": { "type": "integer" },
        "output_tokens": { "type": "integer" },
        "cached_input_tokens": { "type": "integer" }
      }
    },
    "routing": {
      "type": "object",
      "properties": {
        "policy": { "type": "string" },
        "strategy": { "type": "string" },
        "tags": { "type": "array", "items": { "type": "string" } }
      }
    }
  }
}