Get major shareholders of a company. Args: symbol: Stock ticker symbol (e.g. VNM, FPT, ACB) source: Data source - VCI or KBS (default: VCI)
AI agents call company_shareholders to retrieve information from VNStock Agent MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a query operation to fetch shareholder information, which is a read-only action with no side effects. It does not create, modify, delete, or execute any operations. The data returned (shareholder lists) is informational and publicly available financial data. Even if misused by an AI agent, it would only retrieve information without causing any system or data damage.
From the tool's definition Tool retrieves 'major shareholders of a company' with arguments for stock symbol and data source selection. No modification, deletion, or execution capabilities are present. This is a straightforward data retrieval operation.
Documented attack patterns abuse exactly the kind of access company_shareholders gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and VNStock Agent MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for company_shareholders:
{
"version": "1",
"default": "deny",
"tools": {
"company_shareholders": {}
}
}company_shareholders is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get major shareholders of a company. Args: symbol: Stock ticker symbol (e.g. VNM, FPT, ACB) source: Data source - VCI or KBS (default: VCI). It is categorised as a Read tool in the VNStock Agent MCP Server MCP Server, which means it retrieves data without modifying state.
Register the VNStock Agent MCP Server MCP server in PolicyLayer and add a rule for company_shareholders: 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 VNStock Agent MCP Server. Nothing to install.
company_shareholders 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 company_shareholders 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 company_shareholders. 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.
company_shareholders is provided by the VNStock Agent MCP Server MCP server (mrgoonie/vnstock-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from VNStock Agent MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
21 VNStock Agent MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.