List custom ISO images (user-uploaded).
AI agents call list_custom_isos to retrieve information from Vultr MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists existing custom ISO images owned by the user. It performs a read-only query against the Vultr infrastructure—no data is created, modified, deleted, or executed. The blast radius of misuse is minimal: an attacker could enumerate what ISO images exist in the account, but cannot execute code, corrupt data, or access resources outside Vultr.
From the tool's definition Tool name 'list_custom_isos' and description 'List custom ISO images (user-uploaded)' indicate a retrieval/query operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_custom_isos gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vultr MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_custom_isos:
{
"version": "1",
"default": "deny",
"tools": {
"list_custom_isos": {}
}
}list_custom_isos is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List custom ISO images (user-uploaded). It is categorised as a Read tool in the Vultr MCP MCP Server, which means it retrieves data without modifying state.
Register the Vultr MCP server in PolicyLayer and add a rule for list_custom_isos: 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 Vultr MCP. Nothing to install.
list_custom_isos 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_custom_isos 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_custom_isos. 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_custom_isos is provided by the Vultr MCP server (rsp2k/mcp-vultr). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Vultr MCP, 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.
284 Vultr MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.