AI agents call get_margin_ratio to retrieve information from Moomoo Api without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves financial market data (margin ratios) but does not execute trades, move money, or modify any account state. It is purely informational, similar to sibling tools like get_account_summary, get_historical_klines, and get_deals which are all Read operations. Even though it concerns financial markets, the action itself is read-only querying with no financial consequences.
From the tool's definition Tool name 'get_margin_ratio' and description 'Get margin ratio for stocks' indicate a query operation that retrieves margin ratio data without modifying or executing trades. This is a data retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access get_margin_ratio gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Moomoo Api, and nothing reaches the server without passing your rules. This is the rule we recommend for get_margin_ratio:
{
"version": "1",
"default": "deny",
"tools": {
"get_margin_ratio": {}
}
}get_margin_ratio is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get margin ratio for stocks. It is categorised as a Read tool in the Moomoo Api MCP Server, which means it retrieves data without modifying state.
Register the Moomoo Api MCP server in PolicyLayer and add a rule for get_margin_ratio: 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 Moomoo Api. Nothing to install.
get_margin_ratio 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 get_margin_ratio 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 get_margin_ratio. 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.
get_margin_ratio is provided by the Moomoo Api MCP server (litash/moomoo-api-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Moomoo Api, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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22 Moomoo Api tools catalogued and risk-classified — across an index of 43,000+ MCP servers.