listing_all_symbols

THE RISK

Low Risk

Why listing_all_symbols needs a policy

This tool queries and returns a static list of stock symbols from Vietnamese exchanges. It performs no write, delete, execute, or financial operations. The action is read-only data retrieval, making it the safest category. Severity is low because misuse would only expose publicly available market information.

From the tool's definition Tool description states 'Get all listed stock symbols' - a pure retrieval operation with no side effects. Arguments are limited to source selection (VCI or KBS), which only affects data retrieval, not modification or execution.

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

POLICY

How to control listing_all_symbols

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 listing_all_symbols:

policy.json

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

listing_all_symbols 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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FAQ

Questions about listing_all_symbols

What does the listing_all_symbols tool do? +

Get all listed stock symbols on Vietnamese exchanges (HOSE, HNX, UPCOM). Args: 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 listing_all_symbols? +

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

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

Can I rate-limit listing_all_symbols? +

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

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

listing_all_symbols 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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