Get P/E ratios, dividend yields, and price-to-book ratios for all stocks
AI agents call getStockPERatios to retrieve information from TWSE 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 publicly available financial metrics and valuation ratios from the Taiwan Stock Exchange. It performs a read-only query operation that does not create, modify, delete, execute commands, or move money. The risk is minimal—misuse would only expose publicly available market information. Severity is low because the data is typically public and non-sensitive.
From the tool's definition Tool name 'getStockPERatios' and description 'Get P/E ratios, dividend yields, and price-to-book ratios' indicate data retrieval with no modification or deletion.
Attacks that exploit this kind of access
Get P/E ratios, dividend yields, and price-to-book ratios for all stocks. It is categorised as a Read tool in the TWSE MCP Server MCP Server, which means it retrieves data without modifying state.
Register the TWSE MCP Server MCP server in PolicyLayer and add a rule for getStockPERatios: 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 TWSE MCP Server. Nothing to install.
getStockPERatios 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 getStockPERatios 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 getStockPERatios. 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.
getStockPERatios is provided by the TWSE MCP Server MCP server (pyang2045/twsemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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