AI agents call stock_changes_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.
Based on the tool name and context of sibling tools on this server (all Read-category data retrieval functions), this tool appears to fetch or query stock price change information from Chinese stock exchanges. No write, delete, execute, or financial transaction capabilities are evident.
From the tool's definition Tool name 'stock_changes_em' suggests retrieval of stock change data from EM (East Money) data source. No description provided, but naming convention and sibling tools (all data retrieval functions like 'stock_a_all_pb', 'stock_a_high_low_statistics')…
Documented attack patterns abuse exactly the kind of access stock_changes_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_changes_em:
{
"version": "1",
"default": "deny",
"tools": {
"stock_changes_em": {}
}
}stock_changes_em is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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stock_changes_em. 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_changes_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_changes_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_changes_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_changes_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_changes_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.
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351 China Stock MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.