AI agents call get_option_butterfly to retrieve information from Futu Stock MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The name and server context indicate this retrieves market data about option butterfly spreads, which is a Read operation (query/fetch financial data). However, confidence is moderate because the description is empty and the tool name alone could theoretically relate to execution or analysis.
From the tool's definition Tool name 'get_option_butterfly' suggests querying option butterfly spread data (a financial analysis function). No description provided to clarify intent.
Documented attack patterns abuse exactly the kind of access get_option_butterfly gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Futu Stock MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_option_butterfly:
{
"version": "1",
"default": "deny",
"tools": {
"get_option_butterfly": {}
}
}get_option_butterfly is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_option_butterfly. It is categorised as a Read tool in the Futu Stock MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Futu Stock MCP Server MCP server in PolicyLayer and add a rule for get_option_butterfly: 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 Futu Stock MCP Server. Nothing to install.
get_option_butterfly 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_option_butterfly 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_option_butterfly. 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_option_butterfly is provided by the Futu Stock MCP Server MCP server (shuizhengqi1/futu-stock-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 44 Futu Stock MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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44 Futu Stock MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.