AI agents call vercel_domains to retrieve information from Access 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 domain configuration data without creating, modifying, or deleting resources. It is a read-only query operation. Severity is low because the blast radius of an AI agent listing domains is minimal—viewing domain assignments poses no immediate risk to systems or data.
From the tool's definition Tool name 'vercel_domains' and description 'List all custom domains configured across Vercel projects' indicates a retrieval operation. The phrase 'check configuration' and 'audit domain assignments' confirms query-only intent with no modification or deletion.
Attacks that exploit this kind of access
List all custom domains configured across Vercel projects, including their DNS verification status and associated project. Use this to audit domain assignments or check configuration. It is categorised as a Read tool in the Access MCP Server, which means it retrieves data without modifying state.
Register the Access MCP server in PolicyLayer and add a rule for vercel_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 Access. Nothing to install.
vercel_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_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_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_domains is provided by the Access MCP server (scottpedia0/access). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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