create-element-type

SERVERMcp Dev SOURCE@umbraco-cms/mcp-dev

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mcp-dev/create-element-type.md

WHAT IT DOES

What create-element-type does on Mcp Dev

AI agents use create-element-type to create or update resources in Mcp Dev, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Dev environment.

RISK

Why create-element-type is rated Medium

This tool creates new content schema elements (element types) in Umbraco, which is a reversible write operation. It modifies the CMS structure by adding new element type definitions, but does not execute arbitrary code, delete data, or move money.

From the tool's definition Tool description states 'Creates a new element type in Umbraco' - the word 'creates' indicates data modification. Element types are schema/configuration objects in Umbraco CMS.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create-element-type safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Dev, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create-element-type, this is the rule to start with:

create-element-type Rate-limited

create-element-type 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create-element-type": {
      "limits": [
        {
          "counter": "create-element-type_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Dev, apply this rule, and every create-element-type call is checked against it from then on.

FAQ

Questions about create-element-type

What does the create-element-type tool do? +

Creates a new element type in Umbraco. IMPORTANT: IMPLEMENTATION REQUIREMENTS 1. ALWAYS use the get-icons tool to find a valid icon name 2. When referencing data types, first find them using find-data-type to get their correct IDs 3. When adding compositions, first use get-document-type-root to find the actual ID of the document type 4. The tool will automatically generate UUIDs for properties and containers 5. Always create new element types in the root before copying to a new folder if required 6. Property container structure: - Properties MUST specify either a. It is categorised as a Write tool in the Mcp Dev 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-element-type? +

Register the Mcp Dev MCP server in PolicyLayer and add a rule for create-element-type: 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 Mcp Dev. Nothing to install.

What risk level is create-element-type? +

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

Can I rate-limit create-element-type? +

Yes. Add a rate_limit block to the create-element-type 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-element-type completely? +

Set action: deny in the PolicyLayer policy for create-element-type. 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-element-type? +

create-element-type is provided by the Mcp Dev MCP server (@umbraco-cms/mcp-dev). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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