Fetch current stock quote data from Yahoo Finance for a given ticker symbol.
AI agents call get_stock_quote to retrieve information from StockQuotes MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries publicly available stock market data. It has no side effects—it does not create, modify, delete, execute code, or move money. The data fetched is read-only market information. Even though it relates to financial markets, it is a passive data retrieval operation, not a financial transaction or commitment of funds.
From the tool's definition Tool name 'get_stock_quote' and description 'Fetch current stock quote data from Yahoo Finance for a given ticker symbol' indicate retrieval of existing financial data with no modification, deletion, or financial transaction capability.
Documented attack patterns abuse exactly the kind of access get_stock_quote gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and StockQuotes MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_stock_quote:
{
"version": "1",
"default": "deny",
"tools": {
"get_stock_quote": {}
}
}get_stock_quote is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch current stock quote data from Yahoo Finance for a given ticker symbol. It is categorised as a Read tool in the StockQuotes MCP MCP Server, which means it retrieves data without modifying state.
Register the StockQuotes MCP server in PolicyLayer and add a rule for get_stock_quote: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches StockQuotes MCP. Nothing to install.
get_stock_quote is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_stock_quote rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for get_stock_quote. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
get_stock_quote is provided by the StockQuotes MCP server (lionelschiepers/stockquotes.mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from StockQuotes MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
4 StockQuotes MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.