AI agents call stock_main_stock_holder 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.
The tool name suggests it retrieves information about major stockholders of stocks, which is a read-only data retrieval operation consistent with the server's data aggregation purpose. No side effects, modifications, deletions, or financial transactions are implied.
From the tool's definition Tool name 'stock_main_stock_holder' indicates retrieval of stockholder information data. Server purpose is to 'fetch real-time and historical data from various Chinese exchanges.' Sibling tools are all data retrieval operations (news_report_time_baidu,…
Documented attack patterns abuse exactly the kind of access stock_main_stock_holder 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_main_stock_holder:
{
"version": "1",
"default": "deny",
"tools": {
"stock_main_stock_holder": {}
}
}stock_main_stock_holder is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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stock_main_stock_holder. 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_main_stock_holder: 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_main_stock_holder 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_main_stock_holder 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_main_stock_holder. 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_main_stock_holder 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.