yahoo_quote_summary
AI agents call yahoo_quote_summary 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 summary data from Yahoo Finance. Despite the empty description, the naming convention, sibling tools, and server purpose all indicate read-only query operations. No side effects or state changes are performed. Confidence is slightly reduced (0.85 rather than higher) due to the empty description, but the categorical evidence from context is strong.
From the tool's definition Tool name 'yahoo_quote_summary' with sibling tools 'yahoo_quote', 'yahoo_stock_history', 'yahoo_search', 'yahoo_chart' all indicate data retrieval operations.
Attacks that exploit this kind of access
yahoo_quote_summary. 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_summary: 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_summary 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_summary 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_summary. 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_summary 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.
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