AI agents call list_vms to retrieve information from VMware Fusion MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns information about virtual machines without creating, modifying, deleting, or executing any operations on them. It is a passive read operation with minimal blast radius—an agent using this tool cannot cause damage or unintended system changes. Severity is low because listing VMs poses no operational risk.
From the tool's definition Tool name 'list_vms' and description 'List all VMs in VMware Fusion' indicate a query/retrieval operation with no side effects or modifications.
Documented attack patterns abuse exactly the kind of access list_vms gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and VMware Fusion MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_vms:
{
"version": "1",
"default": "deny",
"tools": {
"list_vms": {}
}
}list_vms is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all VMs in VMware Fusion. It is categorised as a Read tool in the VMware Fusion MCP Server MCP Server, which means it retrieves data without modifying state.
Register the VMware Fusion MCP Server MCP server in PolicyLayer and add a rule for list_vms: 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 VMware Fusion MCP Server. Nothing to install.
list_vms 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 list_vms 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 list_vms. 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.
list_vms is provided by the VMware Fusion MCP Server MCP server (yeahdongcn/vmware-fusion-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from VMware Fusion 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.
4 VMware Fusion MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.