AI agents use vercel_add_domain to create or update resources in Vercel — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Vercel environment.
This tool creates/adds a new domain to a Vercel project, which is a reversible write operation (the domain can be deleted via vercel_delete_domain, which is present on the same server). It does not execute arbitrary code, delete data irreversibly, or move money.
From the tool's definition Tool name 'vercel_add_domain' and description 'Add a new domain' indicate a create operation that modifies project configuration by adding a new domain resource.
Documented attack patterns abuse exactly the kind of access vercel_add_domain 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_add_domain:
{
"version": "1",
"default": "deny",
"tools": {
"vercel_add_domain": {
"limits": [
{
"counter": "vercel_add_domain_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}vercel_add_domain stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Add a new domain. It is categorised as a Write tool in the Vercel MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vercel MCP server in PolicyLayer and add a rule for vercel_add_domain: 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_add_domain is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the vercel_add_domain 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_add_domain. 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_add_domain 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.
Free to start. No card required.
13 Vercel tools catalogued and risk-classified — across an index of 43,000+ MCP servers.