AI agents call stock_margin_ratio_pa 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 appears to retrieve margin ratio information for stocks, which is a read operation with no side effects. However, confidence is moderate (0.75) rather than high because the description is empty, preventing direct confirmation. The context from sibling tools and server purpose strongly suggests data retrieval, but without explicit documentation we cannot definitively rule out a misnamed execute tool.
From the tool's definition Tool name 'stock_margin_ratio_pa' suggests querying stock margin ratio data. The server description emphasizes 'fetch real-time and historical data' and sibling tools (stock_a_all_pb, stock_a_high_low_statistics, etc.) are all clearly data-retrieval functions.
Documented attack patterns abuse exactly the kind of access stock_margin_ratio_pa 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_margin_ratio_pa:
{
"version": "1",
"default": "deny",
"tools": {
"stock_margin_ratio_pa": {}
}
}stock_margin_ratio_pa is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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stock_margin_ratio_pa. 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_margin_ratio_pa: 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_margin_ratio_pa 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_margin_ratio_pa 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_margin_ratio_pa. 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_margin_ratio_pa 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.