{
  "type": "object",
  "properties": {
    "contents": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "role": {
            "type": "string",
            "enum": ["user", "system", "assistant"]
          },
          "parts": {
            "type": "array",
            "items": {
              "oneOf": [
                {
                  "type": "object",
                  "properties": {
                    "text": { "type": "string" }
                  },
                  "required": ["text"]
                },
                {
                  "type": "object",
                  "properties": {
                    "inline_data": {
                      "type": "object",
                      "properties": {
                        "mime_type": { "type": "string" },
                        "data": { "type": "string", "description": "Base64 encoded data" }
                      },
                      "required": ["mime_type", "data"]
                    }
                  },
                  "required": ["inline_data"]
                }
              ]
            }
          }
        },
        "required": ["role", "parts"]
      }
    },
    "tools": {
      "type": ["array", "null"],
      "description": "Functions the model can call, specified using OpenAPI schema",
      "items": {
        "type": "object",
        "properties": {
          "function_declarations": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "name": { "type": "string" },
                "description": { "type": "string" },
                "parameters": {
                  "type": "object",
                  "properties": {
                    "type": { "type": "string", "enum": ["object"] },
                    "properties": {
                      "location": { "type": "string" },
                      "movie": { "type": "string" }
                    },
                    "required": ["location", "movie"]
                  }
                }
              },
              "required": ["name", "parameters"]
            }
          }
        }
      }
    },
    "system_instructions": {
      "type": ["string", "null"],
      "description": "Instructions to guide the model's behavior"
    }
  },
  "required": ["contents"],
  "additionalProperties": false
}