AI agents call stock_register_cyb 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 the server context (read-only Chinese stock market data via AKShare) and the naming pattern consistent with other sibling tools (all appear to be data retrieval tools), this tool likely retrieves registration or listing data for ChiNext Board (CYB = 创业板) stocks. No description is available to confirm, so confidence is reduced.
From the tool's definition Tool name 'stock_register_cyb' and server description mentions 'fetch real-time and historical data' — no description provided for this specific tool.
Documented attack patterns abuse exactly the kind of access stock_register_cyb 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_register_cyb:
{
"version": "1",
"default": "deny",
"tools": {
"stock_register_cyb": {}
}
}stock_register_cyb is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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stock_register_cyb. 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_register_cyb: 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_register_cyb 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_register_cyb 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_register_cyb. 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_register_cyb 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.