AI agents call stock_news to retrieve information from FinQ4Cn MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool is named 'stock_news' and sits within a server designed for 'free, open-source access to China A-share financial data.' Financial news retrieval is a pure-read operation—it queries and returns news without modifying, deleting, or executing external operations. Confidence is moderate (0.8) due to the empty description, but the naming and context strongly indicate a read-only data retrieval function.
From the tool's definition Tool name 'stock_news' and server context (financial data provider for quantitative analysis) indicate this retrieves news data.
Documented attack patterns abuse exactly the kind of access stock_news gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FinQ4Cn MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for stock_news:
{
"version": "1",
"default": "deny",
"tools": {
"stock_news": {}
}
}stock_news is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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stock_news. It is categorised as a Read tool in the FinQ4Cn MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FinQ4Cn MCP Server MCP server in PolicyLayer and add a rule for stock_news: 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 FinQ4Cn MCP Server. Nothing to install.
stock_news 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 stock_news 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 stock_news. 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.
stock_news is provided by the FinQ4Cn MCP Server MCP server (jinhongzou/finq4cn-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from FinQ4Cn 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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13 FinQ4Cn MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.