fund_listing

THE RISK

Low Risk

Why fund_listing needs a policy

This tool retrieves and queries public market data (mutual fund listings) without side effects. It does not create, modify, delete, or execute any operations. This is a straightforward Read operation with minimal risk — the worst case is an AI agent returns inaccurate or stale fund information to a user, which has low impact.

From the tool's definition Tool description states 'Get list of open-ended mutual funds available in Vietnam' — a retrieval operation with no modification, deletion, or execution capability. The verb 'Get list' indicates a query-only action.

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

POLICY

How to control fund_listing

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 fund_listing:

policy.json

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

fund_listing 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

Related tools and policies

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All 21 VNStock Agent MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about fund_listing

What does the fund_listing tool do? +

Get list of open-ended mutual funds available in Vietnam. 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 fund_listing? +

Register the VNStock Agent MCP Server MCP server in PolicyLayer and add a rule for fund_listing: 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 fund_listing? +

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

Can I rate-limit fund_listing? +

Yes. Add a rate_limit block to the fund_listing 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 fund_listing completely? +

Set action: deny in the PolicyLayer policy for fund_listing. 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 fund_listing? +

fund_listing 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.

CHECK YOUR STACK →