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