Get daily market index statistics including TAIEX and other indices
AI agents call getMarketIndex 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 read-only market data (daily index statistics like TAIEX). There is no data modification, deletion, code execution, or financial transaction capability. The blast radius of misuse is minimal—the worst case is returning inaccurate market information to an agent, which does not cause operational harm or irreversible damage. This is a standard data retrieval operation.
From the tool's definition Tool name 'getMarketIndex' and description 'Get daily market index statistics including TAIEX and other indices' indicate a retrieval operation that queries and returns market data without any side effects or modifications.
Attacks that exploit this kind of access
Get daily market index statistics including TAIEX and other indices. 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 getMarketIndex: 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.
getMarketIndex 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 getMarketIndex 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 getMarketIndex. 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.
getMarketIndex 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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