n8n_create_user · n8n MCP Server MCP: Risk & Policy

WHAT IT DOES

What n8n_create_user does on n8n MCP Server

AI agents use n8n_create_user to create or update resources in n8n MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your n8n MCP Server environment.

WHY IT NEEDS A POLICY

Why n8n_create_user needs a policy

This tool creates a new user account in n8n, which modifies the system's user database. This is a Write operation (reversible modification of data). Severity is high because creating unauthorized user accounts could grant attackers persistence, lateral movement, or access to sensitive workflows and credentials within the n8n instance.

From the tool's definition Tool name: n8n_create_user. Tool description: 'Create a new user'. Creates a new user account in the n8n instance, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

n8n_create_user Rate-limited

n8n_create_user 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": {
    "n8n_create_user": {
      "limits": [
        {
          "counter": "n8n_create_user_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 n8n MCP Server, so you can run agents against it safely.

FAQ

Questions about n8n_create_user

What does the n8n_create_user tool do? +

Create a new user. It is categorised as a Write tool in the n8n 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 n8n_create_user? +

Register the n8n MCP Server MCP server in PolicyLayer and add a rule for n8n_create_user: 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 n8n MCP Server. Nothing to install.

What risk level is n8n_create_user? +

n8n_create_user is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit n8n_create_user? +

Yes. Add a rate_limit block to the n8n_create_user 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 n8n_create_user completely? +

Set action: deny in the PolicyLayer policy for n8n_create_user. 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 n8n_create_user? +

n8n_create_user is provided by the n8n MCP Server MCP server (shravan1610/n8n-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.