check_domain

THE RISK

Low Risk

Why check_domain needs a policy

This tool performs a read-only check of domain availability. It queries information from the Porkbun registry but does not create, modify, delete, or execute any state-changing operations. The severity is low because misuse would only retrieve informational data with no blast radius to production systems or financial consequences.

From the tool's definition Tool name 'check_domain' and description 'Checks the availability of a domain name' indicate a query operation that retrieves availability status without modifying, deleting, or executing external operations.

Documented attack patterns abuse exactly the kind of access check_domain gives an agent:

POLICY

How to control check_domain

PolicyLayer is an MCP gateway — it sits between your AI agents and Porkbun MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for check_domain:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "check_domain": {}
  }
}

check_domain is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Porkbun MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Porkbun MCP Server tools

Destructive delete_dns_record Removes a specific DNS record using its ID. Destructive delete_dns_record_by_name_type Deletes all DNS records matching a domain, subdomain (optional), and type. Corresponds to Destructive delete_dnssec_record Deletes a DNSSEC record associated with the domain at the registry by Key Tag. Destructive delete_url_forward Deletes a URL forward record for a domain by its ID. Write add_url_forward Adds URL forwarding for a domain or subdomain. Write create_dns_record Adds a new DNS record to a specified domain. Write create_dnssec_record Creates a DNSSEC record at the registry for the domain. Write edit_dns_record Modifies an existing DNS record using its ID.

All 20 Porkbun MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about check_domain

What does the check_domain tool do? +

Checks the availability of a domain name. It is categorised as a Read tool in the Porkbun MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on check_domain? +

Register the Porkbun MCP Server MCP server in PolicyLayer and add a rule for check_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 Porkbun MCP Server. Nothing to install.

What risk level is check_domain? +

check_domain is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit check_domain? +

Yes. Add a rate_limit block to the check_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.

How do I block check_domain completely? +

Set action: deny in the PolicyLayer policy for check_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.

What MCP server provides check_domain? +

check_domain is provided by the Porkbun MCP Server MCP server (miraclebakelaser/porkbun-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Porkbun MCP Server tool call.

Start from Porkbun MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →