Function: update_market_status
Description: This tool belongs to the trading system, which allows users to trade stocks, manage their account, and view stock information. Tool description: Update the market status based on the current time.
Parameters:
type: dict
properties: current_time_str: type: string
description: Current time in HH:MM AM/PM format. 
required: current_time_str
Response:
type: dict
properties: status: type: string
description: Status of the market. [Enum]: ["Open", "Closed"]