yfinance_get_top
AI agents call yfinance_get_top to retrieve information from Yahoo Finance MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Based on naming convention and context within a Yahoo Finance data-fetching server, this tool retrieves ranking or list data (likely top stocks/gainers/losers) without modifying, executing external operations, or affecting financial transactions. No query execution, code execution, or destructive capability is implied.
From the tool's definition Tool name 'yfinance_get_top' follows the 'yfinance_get_*' pattern consistent with sibling tools that fetch financial data (yfinance_get_financials, yfinance_get_price_history, yfinance_get_ticker_info, yfinance_get_ticker_news).
Attacks that exploit this kind of access
yfinance_get_top. It is categorised as a Read tool in the Yahoo Finance MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Finance MCP Server MCP server in PolicyLayer and add a rule for yfinance_get_top: 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 Yahoo Finance MCP Server. Nothing to install.
yfinance_get_top 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 yfinance_get_top 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 yfinance_get_top. 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.
yfinance_get_top is provided by the Yahoo Finance MCP Server MCP server (narumiruna/yfinance-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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