create_subdomain | PolicyLayer

WHAT IT DOES

What create_subdomain does on Sperax Ecosystem Crypto & DeFI MCP Server

AI agents use create_subdomain to create or update resources in Sperax Ecosystem Crypto & DeFI MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sperax Ecosystem Crypto & DeFI MCP Server environment.

THE RISK

Medium Risk

Why create_subdomain needs a policy

This tool performs a reversible write operation by creating a new subdomain record. While it modifies blockchain state (ENS registry), the action is non-destructive and can be reverted. The severity is medium because misuse could spam subdomains under a compromised ENS name or cause naming confusion, but the blast radius is limited to the owner's ENS domain namespace.

From the tool's definition Tool description states it will 'Create a subdomain under an ENS name you own' - a create action that modifies ENS records and establishes new DNS/naming infrastructure.

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

POLICY

How to control create_subdomain

PolicyLayer is an MCP gateway — it sits between your AI agents and Sperax Ecosystem Crypto & DeFI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_subdomain:

policy.json

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

create_subdomain 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 Sperax Ecosystem Crypto & DeFI 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 →

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EXPLORE

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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 create_subdomain

What does the create_subdomain tool do? +

Create a subdomain under an ENS name you own. It is categorised as a Write tool in the Sperax Ecosystem Crypto & DeFI 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 create_subdomain? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for create_subdomain: 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 Sperax Ecosystem Crypto & DeFI MCP Server. Nothing to install.

What risk level is create_subdomain? +

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

Can I rate-limit create_subdomain? +

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

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

create_subdomain is provided by the Sperax Ecosystem Crypto & DeFI MCP Server MCP server (sperax/sperax-crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sperax Ecosystem Crypto & DeFI MCP Server tool call.

Start from Sperax Ecosystem Crypto & DeFI 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 →

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1318 Sperax Ecosystem Crypto & DeFI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.