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 Chinese ZZ500 (中证500) stock index data with no apparent side effects. It follows the read-only pattern of other 'get_' prefixed tools on the server. The empty description reduces confidence slightly, but the context and naming convention strongly indicate a data retrieval operation. Even if misused, it cannot modify, delete, or transfer financial assets—only expose publicly available market data.
From the tool's definition Tool name 'get_zz500_stocks' indicates a retrieval operation for stock data. Server description explicitly states it 'query[s]' stock data.
Attacks that exploit this kind of access
get_zz500_stocks. 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 (kissjerryfan/mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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