create-language

Creates a new language

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-language.md

WHAT IT DOES

What create-language does on Mcp Dev

AI agents use create-language 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-language is rated Medium

This tool creates a new language configuration in Umbraco CMS, which is a reversible operation. The language can be modified or removed later. While it affects system configuration, it does not execute arbitrary code, delete data irreversibly, or involve financial transactions. The 'create' operation falls squarely into the Write category.

From the tool's definition Tool name is 'create-language' and description states 'Creates a new language'. The verb 'creates' indicates a data modification operation that adds a new entity to the system.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create-language 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-language, this is the rule to start with:

create-language Rate-limited

create-language 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-language": {
      "limits": [
        {
          "counter": "create-language_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-language call is checked against it from then on.

FAQ

Questions about create-language

What does the create-language tool do? +

Creates a new language. 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-language? +

Register the Mcp Dev MCP server in PolicyLayer and add a rule for create-language: 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-language? +

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

Can I rate-limit create-language? +

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

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

create-language 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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