update_nameservers

THE RISK

Medium Risk

Why update_nameservers needs a policy

This tool modifies domain configuration (nameservers) in a way that affects how the domain resolves, but the change is not irreversible. It belongs in Write rather than Execute because it doesn't run arbitrary code or trigger external operations—it simply updates a configuration value.

From the tool's definition Tool description states it 'Updates the nameservers for a specified domain.' Nameserver changes are configuration modifications that alter DNS resolution behavior for a domain but are reversible by updating them again.

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

POLICY

How to control update_nameservers

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 update_nameservers:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update_nameservers": {
      "limits": [
        {
          "counter": "update_nameservers_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

update_nameservers 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.

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.

LIMIT 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 →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about update_nameservers

What does the update_nameservers tool do? +

Updates the nameservers for a specified domain. It is categorised as a Write tool in the Porkbun MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_nameservers? +

Register the Porkbun MCP Server MCP server in PolicyLayer and add a rule for update_nameservers: 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 update_nameservers? +

update_nameservers is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit update_nameservers? +

Yes. Add a rate_limit block to the update_nameservers 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 update_nameservers completely? +

Set action: deny in the PolicyLayer policy for update_nameservers. 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 update_nameservers? +

update_nameservers 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 →