yahoo_quote
AI agents call yahoo_quote to retrieve information from YFinance MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves financial data (quotes) from Yahoo Finance with no apparent ability to modify, delete, or execute operations. The absence of a tool description lowers confidence slightly, but the naming convention and server context strongly suggest it queries and returns stock quote data only, consistent with Read category operations.
From the tool's definition Tool name 'yahoo_quote' and server purpose describe 'retrieval of real-time quotes' and 'seamless access to Yahoo Finance stock market data'.
Attacks that exploit this kind of access
yahoo_quote. It is categorised as a Read tool in the YFinance MCP Server MCP Server, which means it retrieves data without modifying state.
Register the YFinance MCP Server MCP server in PolicyLayer and add a rule for yahoo_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 YFinance MCP Server. Nothing to install.
yahoo_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 yahoo_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 yahoo_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.
yahoo_quote is provided by the YFinance MCP Server MCP server (szemeng76/yfinance-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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