get_stock_price_by_date

Retrieve the stock price for a specific symbol on a chosen date using Yahoo Finance data. Input the stock symbol and date in YYYY-MM-DD format for accurate results.

Instructions

Get the stock price for a given stock symbol on a specific date.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`date`	Yes	The date in YYYY-MM-DD format.
`symbol`	Yes	Stock symbol in Yahoo Finance format.

Implementation Reference

src/mcp_yahoo_finance/server.py:37-46 (handler)

Core handler function that implements the logic to fetch the closing stock price for a given symbol and date using yfinance library.

def get_stock_price_by_date(self, symbol: str, date: str) -> str:
    """Get the stock price for a given stock symbol on a specific date.

    Args:
        symbol (str): Stock symbol in Yahoo Finance format.
        date (str): The date in YYYY-MM-DD format.
    """
    stock = Ticker(ticker=symbol, session=self.session)
    price = stock.history(start=date, period="1d")
    return f"{price.iloc[0]['Close']:.4f}"

src/mcp_yahoo_finance/server.py:220-235 (registration)

Registration of all tools including get_stock_price_by_date via generate_tool in the MCP list_tools handler.

@server.list_tools()
async def list_tools() -> list[Tool]:
    return [
        generate_tool(yf.get_current_stock_price),
        generate_tool(yf.get_stock_price_by_date),
        generate_tool(yf.get_stock_price_date_range),
        generate_tool(yf.get_historical_stock_prices),
        generate_tool(yf.get_dividends),
        generate_tool(yf.get_income_statement),
        generate_tool(yf.get_cashflow),
        generate_tool(yf.get_earning_dates),
        generate_tool(yf.get_news),
        generate_tool(yf.get_recommendations),
        generate_tool(yf.get_option_expiration_dates),
        generate_tool(yf.get_option_chain),
    ]

src/mcp_yahoo_finance/server.py:243-245 (handler)
Dispatch handler in MCP call_tool that invokes the get_stock_price_by_date method with arguments and returns the result as TextContent.
```
case "get_stock_price_by_date":
    price = yf.get_stock_price_by_date(**args)
    return [TextContent(type="text", text=price)]
```

src/mcp_yahoo_finance/utils.py:31-65 (schema)

Helper function generate_tool that dynamically generates the JSON schema for the tool based on function signature, type annotations, and docstring.

def generate_tool(func: Any) -> Tool:
    """Generates a tool schema from a Python function."""
    signature = inspect.signature(func)
    docstring = inspect.getdoc(func) or ""
    param_descriptions = parse_docstring(docstring)

    schema = {
        "name": func.__name__,
        "description": docstring.split("Args:")[0].strip(),
        "inputSchema": {
            "type": "object",
            "properties": {},
        },
    }

    for param_name, param in signature.parameters.items():
        param_type = (
            "number"
            if param.annotation is float
            else "string"
            if param.annotation is str
            else "string"
        )
        schema["inputSchema"]["properties"][param_name] = {
            "type": param_type,
            "description": param_descriptions.get(param_name, ""),
        }

        if "required" not in schema["inputSchema"]:
            schema["inputSchema"]["required"] = [param_name]
        else:
            if "=" not in str(param):
                schema["inputSchema"]["required"].append(param_name)

    return Tool(**schema)

src/mcp_yahoo_finance/utils.py:7-28 (helper)

Supporting utility to parse Google-style docstrings for parameter descriptions used in schema generation.

def parse_docstring(docstring: str) -> dict[str, str]:
    """Parses a Google-style docstring to extract parameter descriptions."""
    descriptions = {}
    if not docstring:
        return descriptions

    lines = docstring.split("\n")
    current_param = None

    for line in lines:
        line = line.strip()
        if line.startswith("Args:"):
            continue
        elif line and "(" in line and ")" in line and ":" in line:
            param = line.split("(")[0].strip()
            desc = line.split("):")[1].strip()
            descriptions[param] = desc
            current_param = param
        elif current_param and line:
            descriptions[current_param] += " " + line.strip()

    return descriptions

MCP Yahoo Finance