company_news

THE RISK

Low Risk

Why company_news needs a policy

This tool performs a read-only query operation to fetch news data for a given stock symbol. It has no side effects, cannot modify or delete data, and does not execute external operations or commit financial transactions. The blast radius of misuse is minimal—an agent could only retrieve publicly available news information, which poses no security or operational risk.

From the tool's definition Tool retrieves 'latest news about a company' with parameters for stock ticker and data source selection. No modification, deletion, or execution capabilities are described.

Documented attack patterns abuse exactly the kind of access company_news gives an agent:

POLICY

How to control company_news

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_news:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "company_news": {}
  }
}

company_news is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register VNStock Agent MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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FAQ

Questions about company_news

What does the company_news tool do? +

Get latest news about 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.

How do I enforce a policy on company_news? +

Register the VNStock Agent MCP Server MCP server in PolicyLayer and add a rule for company_news: 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.

What risk level is company_news? +

company_news is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit company_news? +

Yes. Add a rate_limit block to the company_news 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.

How do I block company_news completely? +

Set action: deny in the PolicyLayer policy for company_news. 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.

What MCP server provides company_news? +

company_news 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.

Enforce policy on every VNStock Agent MCP Server tool call.

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.

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