AI agents call get_stock_code 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.
This tool appears to retrieve or list stock codes—financial identifiers used in quantitative analysis. This is a data retrieval operation with no side effects on the data store. No money moves, no data is modified or deleted, and no arbitrary code is executed. It falls cleanly into the Read category.
From the tool's definition Tool is named 'get_stock_code' and exists within a financial data server alongside sibling tools like 'get_historical_stockprice_data', 'get_stock_financial_abstract', and 'get_stock_business_structure', which are all clearly data retrieval operations.
Documented attack patterns abuse exactly the kind of access get_stock_code 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 get_stock_code:
{
"version": "1",
"default": "deny",
"tools": {
"get_stock_code": {}
}
}get_stock_code is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_stock_code. 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 get_stock_code: 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.
get_stock_code 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_stock_code 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_stock_code. 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_stock_code 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.