AI agents call get_zz500_stocks to retrieve information from A Share without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves static or reference data about which stocks comprise the CSI 500 index. It is purely informational (Read category), poses minimal risk if misused by an AI agent, and aligns with the server's stated purpose of providing 'data queries' for A-share market information. No data is modified, deleted, executed, or used for financial transactions.
From the tool's definition Tool name 'get_zz500_stocks' and description 'CSI 500 constituents' indicate a retrieval operation that queries data about stock constituents with no side effects.
Documented attack patterns abuse exactly the kind of access get_zz500_stocks gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and A Share, and nothing reaches the server without passing your rules. This is the rule we recommend for get_zz500_stocks:
{
"version": "1",
"default": "deny",
"tools": {
"get_zz500_stocks": {}
}
}get_zz500_stocks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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CSI 500 constituents. It is categorised as a Read tool in the A Share MCP Server, which means it retrieves data without modifying state.
Register the A Share MCP server in PolicyLayer and add a rule for get_zz500_stocks: 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 A Share. Nothing to install.
get_zz500_stocks 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_zz500_stocks 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_zz500_stocks. 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_zz500_stocks is provided by the A Share MCP server (shouldnotappearcalm/a-share-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from A Share, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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55 A Share tools catalogued and risk-classified — across an index of 43,000+ MCP servers.