AI agents call market_subscribe_hq to retrieve information from TdxQuant MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool subscribes to market quotation (行情) updates, which is a read operation that retrieves live financial data. The explicit mention of it being a placeholder callback that only completes the subscription on the terminal side indicates no actual data modification or side effects occur within the MCP server itself. The blast radius of misuse is limited to receiving unwanted market data streams.
From the tool's definition Tool name 'market_subscribe_hq' and description '行情数据：订阅行情更新（MCP 内为占位回调，仅完成终端侧订阅）' indicates subscription to market data updates.
Documented attack patterns abuse exactly the kind of access market_subscribe_hq gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and TdxQuant MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for market_subscribe_hq:
{
"version": "1",
"default": "deny",
"tools": {
"market_subscribe_hq": {}
}
}market_subscribe_hq is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
行情数据：订阅行情更新（MCP 内为占位回调，仅完成终端侧订阅）。. It is categorised as a Read tool in the TdxQuant MCP Server MCP Server, which means it retrieves data without modifying state.
Register the TdxQuant MCP Server MCP server in PolicyLayer and add a rule for market_subscribe_hq: 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 TdxQuant MCP Server. Nothing to install.
market_subscribe_hq 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 market_subscribe_hq 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 market_subscribe_hq. 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.
market_subscribe_hq is provided by the TdxQuant MCP Server MCP server (lingfan/tdxquant-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from TdxQuant MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
39 TdxQuant MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.