AI agents call stock_yjbb_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 tool retrieves historical financial performance reports (年报季报 = annual/quarterly reports, 业绩报表 = performance statements) from a public financial data source. It has no capacity to modify, delete, or execute operations—it only queries and returns existing financial data.
From the tool's definition Tool name 'stock_yjbb_em' and description 'Get 东方财富-数据中心-年报季报-业绩报表' (retrieve performance/earnings reports from East Money data center) indicate a data retrieval operation. The verb 'Get' explicitly signals a read-only fetch operation.
Documented attack patterns abuse exactly the kind of access stock_yjbb_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_yjbb_em:
{
"version": "1",
"default": "deny",
"tools": {
"stock_yjbb_em": {}
}
}stock_yjbb_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-业绩报表. 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_yjbb_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_yjbb_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_yjbb_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_yjbb_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_yjbb_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.