Get top 20 stocks by daily trading volume
AI agents call getTop20Volume 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 historical or current trading volume statistics from the Taiwan Stock Exchange. It is a read-only query that returns information for analysis purposes only. No data is created, modified, deleted, or used to execute trades or financial transactions. The low severity reflects minimal harm potential—an AI agent misusing this tool could only retrieve publicly available market information.
From the tool's definition Tool name 'getTop20Volume' and description 'Get top 20 stocks by daily trading volume' indicate a query operation that retrieves and displays market data without modifying or executing any actions.
Attacks that exploit this kind of access
Get top 20 stocks by daily trading volume. 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 getTop20Volume: 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.
getTop20Volume 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 getTop20Volume 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 getTop20Volume. 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.
getTop20Volume 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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