Return the top N stocks ranked by daily change percent (descending).
AI agents call get_top_gainers to retrieve information from Kookmin Stock without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries historical/real-time Korean stock market data (top gainers by daily change). It has no side effects, does not create, modify, or delete data, does not execute code or financial transactions. It is a read-only data query matching the Read category definition.
From the tool's definition Tool description states 'Return the top N stocks ranked by daily change percent' — a pure retrieval operation with no modification, deletion, or execution of code.
Attacks that exploit this kind of access
Return the top N stocks ranked by daily change percent (descending). It is categorised as a Read tool in the Kookmin Stock MCP Server, which means it retrieves data without modifying state.
Register the Kookmin Stock MCP server in PolicyLayer and add a rule for get_top_gainers: 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 Kookmin Stock. Nothing to install.
get_top_gainers 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_top_gainers 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_top_gainers. 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_top_gainers is provided by the Kookmin Stock MCP server (jooseunghyeon/kookmin-university-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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