Fetches historical K-line (OHLCV) data for a Chinese A-share stock.

    Args:
        code: The stock code in Baostock format (e.g., 'sh.600000', 'sz.000001').
        start_date: Start date in 'YYYY-MM-DD' format.
        end_date: End date in 'YYYY-MM-DD' format.
        frequency: Data frequency. Valid options (from Baostock):
                     'd': daily
                     'w': weekly
                     'm': monthly
                     '5': 5 minutes
                     '15': 15 minutes
                     '30': 30 minutes
                     '60': 60 minutes
                   Defaults to 'd'.
        adjust_flag: Adjustment flag for price/volume. Valid options (from Baostock):
                       '1': Forward adjusted (后复权)
                       '2': Backward adjusted (前复权)
                       '3': Non-adjusted (不复权)
                     Defaults to '3'.
        fields: Optional list of specific data fields to retrieve (must be valid Baostock fields).
                If None or empty, default fields will be used (e.g., date, code, open, high, low, close, volume, amount, pctChg).
        limit: Max rows to return. Defaults to 250.
        format: Output format: 'markdown' | 'json' | 'csv'. Defaults to 'markdown'.

        Returns:
            A Markdown formatted string containing the K-line data table, or an error message.
            The table might be truncated if the result set is too large.
        

    Fetches basic information for a given Chinese A-share stock.

    Args:
        code: The stock code in Baostock format (e.g., 'sh.600000', 'sz.000001').
        fields: Optional list to select specific columns from the available basic info
                (e.g., ['code', 'code_name', 'industry', 'listingDate']).
                If None or empty, returns all available basic info columns from Baostock.

    Returns:
        Basic stock information in the requested format.
    

    Fetches dividend information for a given stock code and year.

    Args:
        code: The stock code in Baostock format (e.g., 'sh.600000', 'sz.000001').
        year: The year to query (e.g., '2023').
        year_type: Type of year. Valid options (from Baostock):
                     'report': Announcement year (预案公告年份)
                     'operate': Ex-dividend year (除权除息年份)
                   Defaults to 'report'.

    Returns:
        Dividend records table.
    

    Fetches adjustment factor data for a given stock code and date range.
    Uses Baostock's "涨跌幅复权算法" factors. Useful for calculating adjusted prices.

    Args:
        code: The stock code in Baostock format (e.g., 'sh.600000', 'sz.000001').
        start_date: Start date in 'YYYY-MM-DD' format.
        end_date: End date in 'YYYY-MM-DD' format.

    Returns:
        Adjustment factors table.
    

    Aggregated financial indicators from 6 Baostock APIs into one convenient query.

    **Data is returned by QUARTER** (Q1, Q2, Q3, Q4) based on financial report dates.
    Input date range determines which quarters to fetch.

    Combines data from:
    - 盈利能力 (Profitability): roeAvg, npMargin, gpMargin, epsTTM
    - 营运能力 (Operation): NRTurnRatio, INVTurnRatio, CATurnRatio
    - 成长能力 (Growth): YOYNI, YOYEquity, YOYAsset
    - 偿债能力 (Solvency): currentRatio, quickRatio, liabilityToAsset
    - 现金流量 (Cash Flow): CFOToOR, CFOToNP, CAToAsset
    - 杜邦分析 (DuPont): dupontROE, dupontAssetTurn, dupontPnitoni

    Output columns include prefixes: profit_*, operation_*, growth_*,
    balance_*, cashflow_*, dupont_* to distinguish data sources.
    

    Fetch trading dates within a specified range.

    Args:
        start_date: Optional. Start date in 'YYYY-MM-DD' format. Defaults to 2015-01-01 if None.
        end_date: Optional. End date in 'YYYY-MM-DD' format. Defaults to the current date if None.

    Returns:
        Markdown table with 'is_trading_day' (1=trading, 0=non-trading).
    

    Fetch a list of all stocks (A-shares and indices) and their trading status for a date.

    Args:
        date: Optional. The date in 'YYYY-MM-DD' format. If None, uses the current date.

    Returns:
        Markdown table listing stock codes and trading status (1=trading, 0=suspended).
    

    Search stocks by code substring on a date.

    Args:
        keyword: Substring to match in the stock code (e.g., '600', '000001').
        date: Optional 'YYYY-MM-DD'. If None, uses current date.
        limit: Max rows to return. Defaults to 50.
        format: Output format: 'markdown' | 'json' | 'csv'. Defaults to 'markdown'.

    Returns:
        Matching stock codes with their trading status.
    

    List suspended stocks for a date.

    Args:
        date: Optional 'YYYY-MM-DD'. If None, uses current date.
        limit: Max rows to return. Defaults to 250.
        format: Output format: 'markdown' | 'json' | 'csv'. Defaults to 'markdown'.

    Returns:
        Table of stocks where tradeStatus==0.
    

    提供基于数据的股票分析报告，而非投资建议。

    Args:
        code: 股票代码，如'sh.600000'
        analysis_type: 'fundamental'|'technical'|'comprehensive'
    

    List valid constants for tool parameters.

    Args:
        kind: Optional filter: 'frequency' | 'adjust_flag' | 'year_type' | 'index'. If None, show all.