AI agents call get_history_kline to retrieve information from 富途 MCP 服务器 (Futu MCP Server) without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical market data (candlestick/K-line charts) from the Futu API. It performs a read-only query operation with no side effects, no code execution, and no data modification. The blast radius of misuse is minimal—an AI agent could retrieve market data unnecessarily or repeatedly, but cannot alter market data, execute trades, delete information, or cause financial harm through this tool alone.
From the tool's definition Tool name 'get_history_kline' and description '获取历史K线数据' (retrieve historical K-line data) indicate data retrieval with no modification, deletion, or execution capabilities.
Documented attack patterns abuse exactly the kind of access get_history_kline gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and 富途 MCP 服务器 (Futu MCP Server), and nothing reaches the server without passing your rules. This is the rule we recommend for get_history_kline:
{
"version": "1",
"default": "deny",
"tools": {
"get_history_kline": {}
}
}get_history_kline is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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获取历史K线数据，支持分钟、日、周、月K线. It is categorised as a Read tool in the 富途 MCP 服务器 (Futu MCP Server) MCP Server, which means it retrieves data without modifying state.
Register the 富途 MCP 服务器 (Futu MCP Server) MCP server in PolicyLayer and add a rule for get_history_kline: 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 富途 MCP 服务器 (Futu MCP Server). Nothing to install.
get_history_kline 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_history_kline 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_history_kline. 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_history_kline is provided by the 富途 MCP 服务器 (Futu MCP Server) MCP server (shuchaang/futu-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from 富途 MCP 服务器 (Futu 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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10 富途 MCP 服务器 (Futu MCP Server) tools catalogued and risk-classified — across an index of 43,000+ MCP servers.