SEP-1034：为征询 schema 中所有基本类型支持默认值

def reply_to_email_thread(
    thread_id: str,
    content: str,
    recipient_list: List[str] = [],
    cc_list: List[str] = []
) -> None:
    # Ambiguity: Does empty list mean "no recipients" or "use defaults"?
    # Complex logic needed to handle different combinations

def reply_to_email_thread(
    thread_id: str,
    content: Optional[str] = ""
) -> None:
    # Code can lookup the participants from the original thread
    # and prepare an elicitation request with the defaults setup

const response = await client.request("elicitation/create", {
  message: "Configure email reply",
  requestedSchema: {
    type: "object",
    properties: {
      recipients: {
        type: "string",
        title: "Recipients",
        default: "alice@company.com, bob@company.com"  // Pre-filled
      },
      cc: {
        type: "string",
        title: "CC",
        default: "john@company.com"  // Pre-filled
      },
      content: {
        type: "string",
        title: "Message"
        default: "" // If provided in the tool above
      }
    }
  }
});

export interface StringSchema {
  type: "string";
  title?: string;
  description?: string;
  minLength?: number;
  maxLength?: number;
  format?: "email" | "uri" | "date" | "date-time";
  default?: string; // NEW
}

export interface NumberSchema {
  type: "number" | "integer";
  title?: string;
  description?: string;
  minimum?: number;
  maximum?: number;
  default?: number; // NEW
}

export interface EnumSchema {
  type: "string";
  title?: string;
  description?: string;
  enum: string[];
  enumNames?: string[];
  default?: string; // NEW - must be one of enum values
}

// BooleanSchema already has default?: boolean