AI agents call get_option_chain 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 tool retrieves options chain information (market data) from the Futu API without modifying or executing any operations. Although the description is empty, the name strongly indicates a query operation that returns options contract data. This follows the same pattern as other 'get_*' siblings on the server that fetch market data. No destructive, write, execute, or financial transaction capability is evident.
From the tool's definition Tool name 'get_option_chain' indicates data retrieval of options chain data. No side effects implied by the naming convention. Consistent with sibling tools like 'get_cur_kline', 'get_asset_list', and 'get_account_list' which are clearly read-only queries.
Documented attack patterns abuse exactly the kind of access get_option_chain 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_chain:
{
"version": "1",
"default": "deny",
"tools": {
"get_option_chain": {}
}
}get_option_chain 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_chain. 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_chain: 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_chain 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_chain 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_chain. 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_chain 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.