AI agents call vercel_list_domains to retrieve information from Vercel without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves domain information associated with a Vercel project without modifying, deleting, or executing any operations. It has minimal blast radius—an AI agent listing domains cannot cause financial loss, data destruction, or unauthorized code execution. The only minor concern is information disclosure, but domain lists are typically not sensitive.
From the tool's definition Tool name 'vercel_list_domains' and description 'List all domains' indicate a retrieval operation with no side effects. The verb 'list' is a classic read-only operation.
Documented attack patterns abuse exactly the kind of access vercel_list_domains gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vercel, and nothing reaches the server without passing your rules. This is the rule we recommend for vercel_list_domains:
{
"version": "1",
"default": "deny",
"tools": {
"vercel_list_domains": {}
}
}vercel_list_domains 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 domains. It is categorised as a Read tool in the Vercel MCP Server, which means it retrieves data without modifying state.
Register the Vercel MCP server in PolicyLayer and add a rule for vercel_list_domains: 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 Vercel. Nothing to install.
vercel_list_domains 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 vercel_list_domains 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 vercel_list_domains. 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.
vercel_list_domains is provided by the Vercel MCP server (xiayeai/vercel-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Vercel, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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13 Vercel tools catalogued and risk-classified — across an index of 43,000+ MCP servers.