AI agents call stock_lh_yyb_control 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.
Based on sibling tools being read-only market data queries (e.g., 'stock_a_all_pb', 'stock_a_high_low_statistics'), this tool likely retrieves Chinese stock data without modification capabilities. The absence of verbs like 'create', 'delete', 'execute', or 'update' in the name suggests data retrieval. However, confidence is moderate due to missing description and unclear meaning of 'yyb_control' suffix.
From the tool's definition Tool name 'stock_lh_yyb_control' appears to be a data retrieval function following the naming pattern of sibling tools (all prefixed with 'stock_' or 'news_'). No description provided, but context suggests stock market data query functionality.
Documented attack patterns abuse exactly the kind of access stock_lh_yyb_control 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_lh_yyb_control:
{
"version": "1",
"default": "deny",
"tools": {
"stock_lh_yyb_control": {}
}
}stock_lh_yyb_control is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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stock_lh_yyb_control. 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_lh_yyb_control: 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_lh_yyb_control 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_lh_yyb_control 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_lh_yyb_control. 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_lh_yyb_control 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.
Free to start. No card required.
351 China Stock MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.