Get financial ratios for a stock.
AI agents call get_financial_ratios 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.
This tool retrieves and presents calculated financial metrics (P/E ratio, debt-to-equity, ROA, etc.) for a given stock ticker. It queries existing financial data to compute ratios but performs no write, execute, destructive, or financial transaction operations. The information returned is read-only analytical data.
From the tool's definition Tool name 'get_financial_ratios' and description 'Get financial ratios for a stock' indicate data retrieval with no modification or execution. The verb 'Get' is characteristic of Read operations.
Attacks that exploit this kind of access
Get financial ratios for a stock. 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 get_financial_ratios: 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.
get_financial_ratios 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_financial_ratios 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_financial_ratios. 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_financial_ratios is provided by the Yahoo Finance MCP Server MCP server (leo-ye0/mcp-finance-data). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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