AI agents call stock_yjkb_em to retrieve information from China Stock MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a data retrieval tool that queries financial reports and performance metrics. It has no ability to modify data, execute code, delete information, or commit financial transactions. The blast radius of misuse is minimal—an agent could at worst retrieve financial data it shouldn't have access to, which is a confidentiality concern but not a capability to cause irreversible damage or execute arbitrary operations.
From the tool's definition The tool name 'stock_yjkb_em' and description indicate it retrieves '业绩快报' (performance/earnings quick reports) from 东方财富's data center. The description uses 'Get', which is a retrieval operation.
Documented attack patterns abuse exactly the kind of access stock_yjkb_em gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and China Stock MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for stock_yjkb_em:
{
"version": "1",
"default": "deny",
"tools": {
"stock_yjkb_em": {}
}
}stock_yjkb_em 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.
Get 东方财富-数据中心-年报季报-业绩快报. It is categorised as a Read tool in the China Stock MCP Server MCP Server, which means it retrieves data without modifying state.
Register the China Stock MCP Server MCP server in PolicyLayer and add a rule for stock_yjkb_em: 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 China Stock MCP Server. Nothing to install.
stock_yjkb_em 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_yjkb_em 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_yjkb_em. 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_yjkb_em is provided by the China Stock MCP Server MCP server (peikuo/china-stock-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from China Stock 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.
351 China Stock MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.