AI agents call search_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.
Despite the empty tool description, the naming pattern and context from the server description and sibling tools clearly indicate this is a query/search operation for stock data. The server explicitly provides '实时行情、历史K线、财务报表' (real-time quotes, historical K-lines, financial statements) retrieval. No side effects or data modification are implied.
From the tool's definition Tool name 'search_stocks' and server context indicating 'data query' (数据查询) capabilities. All sibling tools are data retrieval operations (get_adjust_factor_data, get_balance_data, get_cash_flow_data, etc.) with no modification or deletion semantics.
Documented attack patterns abuse exactly the kind of access search_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 search_stocks:
{
"version": "1",
"default": "deny",
"tools": {
"search_stocks": {}
}
}search_stocks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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search_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 search_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.
search_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 search_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 search_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.
search_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.