AI agents call stock_mda_ym 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.
Despite the empty description lowering confidence, the naming convention and server context (comprehensive access to Chinese stock market data) strongly suggest this is a Read operation that retrieves or queries stock metrics or statistics. No indicators suggest data modification, deletion, code execution, or financial transactions.
From the tool's definition Tool name 'stock_mda_ym' with no description provided. Based on sibling tools on this server (stock_a_all_pb, stock_a_below_net_asset_statistics, stock_a_high_low_statistics, etc.), this appears to be a stock data retrieval/analytics tool following the…
Documented attack patterns abuse exactly the kind of access stock_mda_ym 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_mda_ym:
{
"version": "1",
"default": "deny",
"tools": {
"stock_mda_ym": {}
}
}stock_mda_ym is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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stock_mda_ym. 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_mda_ym: 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_mda_ym 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_mda_ym 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_mda_ym. 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_mda_ym 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.