create-stylesheet · Mcp Dev MCP: Risk & Policy

WHAT IT DOES

What create-stylesheet does on Mcp Dev

AI agents use create-stylesheet 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.

WHY IT NEEDS A POLICY

Why create-stylesheet needs a policy

This tool creates new stylesheets in the CMS, which modifies the system state by adding new resources. While creation is reversible (stylesheets can typically be deleted), it represents a Write operation rather than Read. The severity is medium because unauthorized stylesheet creation could alter site styling and appearance, but is not as severe as destructive deletion, financial impact, or arbitrary code execution.

From the tool's definition Tool is named 'create-stylesheet' with description 'Creates a new stylesheet.' The verb 'creates' indicates irreversible content generation in an Umbraco CMS context.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create-stylesheet Rate-limited

create-stylesheet 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-stylesheet": {
      "limits": [
        {
          "counter": "create-stylesheet_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Dev, so you can run agents against it safely.

FAQ

Questions about create-stylesheet

What does the create-stylesheet tool do? +

Creates a new stylesheet. 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-stylesheet? +

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

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

Can I rate-limit create-stylesheet? +

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

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

create-stylesheet 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.