AI agents call stock_zt_pool_previous_em to retrieve information from China Stock 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 stock market data about daily limit-up (涨停板) stocks from the previous day. It is a read-only query operation that fetches and presents stock market information without modifying any data, executing code, or triggering financial transactions. The blast radius of misuse is minimal—returning incorrect or unexpected stock data would not cause harm beyond misinformation.
From the tool's definition Tool name 'stock_zt_pool_previous_em' and description 'Get 东方财富网-行情中心-涨停板行情-昨日涨停股池' (Fetch East Money Finance - Market Center - Daily Limit Up Stocks - Yesterday's Daily Limit Up Stock Pool).
Documented attack patterns abuse exactly the kind of access stock_zt_pool_previous_em gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and China Stock MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for stock_zt_pool_previous_em:
{
"version": "1",
"default": "deny",
"tools": {
"stock_zt_pool_previous_em": {}
}
}stock_zt_pool_previous_em is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get 东方财富网-行情中心-涨停板行情-昨日涨停股池. It is categorised as a Read tool in the China Stock MCP Server MCP Server, which means it retrieves data without modifying state.
Register the China Stock MCP Server MCP server in PolicyLayer and add a rule for stock_zt_pool_previous_em: 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 China Stock MCP Server. Nothing to install.
stock_zt_pool_previous_em 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 stock_zt_pool_previous_em 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 stock_zt_pool_previous_em. 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.
stock_zt_pool_previous_em is provided by the China Stock MCP Server MCP server (peikuo/china-stock-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from China Stock MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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351 China Stock MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.