여러 종목의 시세를 비교합니다. Args: stock_names: 비교할 종목명 (쉼표 구분, 예: "삼성전자,SK하이닉스,NAVER") date: 조회일 (YYYY-MM-DD). 빈 문자열이면 최근 영업일. Returns: 종목별 시세 비교 (종가, 등락률, 거래량, 시가총액)
Part of the Korean Stock Market Data server.
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AI agents call compare_stocks to retrieve information from Korean Stock Market Data without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though compare_stocks only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"compare_stocks": {}
}
}See the full Korean Stock Market Data policy for all 7 tools.
These attack patterns abuse exactly the kind of access compare_stocks gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
여러 종목의 시세를 비교합니다. Args: stock_names: 비교할 종목명 (쉼표 구분, 예: "삼성전자,SK하이닉스,NAVER") date: 조회일 (YYYY-MM-DD). 빈 문자열이면 최근 영업일. Returns: 종목별 시세 비교 (종가, 등락률, 거래량, 시가총액). It is categorised as a Read tool in the Korean Stock Market Data MCP Server, which means it retrieves data without modifying state.
Register the Korean Stock Market Data MCP server in PolicyLayer and add a rule for compare_stocks: 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 Korean Stock Market Data. Nothing to install.
compare_stocks 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 compare_stocks 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 compare_stocks. 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.
compare_stocks is provided by the Korean Stock Market Data MCP server (https://korean-stock-mcp.onrender.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 7 Korean Stock Market Data tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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