list_monitors_vast

THE RISK

Low Risk

Why list_monitors_vast needs a policy

This tool retrieves information about predefined monitors used for performance visualization. It performs a read-only query operation with no side effects, data modifications, code execution, or destructive actions. The blast radius of misuse is minimal—an agent could only enumerate available monitors, not alter system state or access sensitive data beyond monitor metadata.

From the tool's definition Tool name contains 'list' and description states 'List all available predefined monitors for performance graphs' — indicates querying/retrieving existing monitoring configuration without modification.

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

POLICY

How to control list_monitors_vast

PolicyLayer is an MCP gateway — it sits between your AI agents and VAST Admin MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_monitors_vast:

policy.json

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

list_monitors_vast 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 VAST Admin 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 →

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EXPLORE

Related tools and policies

More VAST Admin MCP Server tools

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All 16 VAST Admin 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 list_monitors_vast

What does the list_monitors_vast tool do? +

List all available predefined monitors for performance graphs. It is categorised as a Read tool in the VAST Admin MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_monitors_vast? +

Register the VAST Admin MCP Server MCP server in PolicyLayer and add a rule for list_monitors_vast: 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 VAST Admin MCP Server. Nothing to install.

What risk level is list_monitors_vast? +

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

Can I rate-limit list_monitors_vast? +

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

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

list_monitors_vast is provided by the VAST Admin MCP Server MCP server (vast-data/vast-admin-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every VAST Admin MCP Server tool call.

Start from VAST Admin 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 →