n8n_create_workflow · n8n MCP Server MCP: Risk & Policy

WHAT IT DOES

What n8n_create_workflow does on n8n MCP Server

AI agents use n8n_create_workflow 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_workflow needs a policy

This is a Write action—it creates new data (a workflow) reversibly. While workflows can contain arbitrary logic including destructive operations, the tool itself only creates/stores the workflow definition. However, severity is high because a malicious workflow could be created to exfiltrate data, trigger destructive actions, or compromise the n8n system.

From the tool's definition Tool creates a new workflow object in n8n with nodes, connections, and settings. The description explicitly states 'Create a new workflow' and accepts parameters that define workflow logic (nodes array, connections object).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

n8n_create_workflow Rate-limited

n8n_create_workflow 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_workflow": {
      "limits": [
        {
          "counter": "n8n_create_workflow_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_workflow

What does the n8n_create_workflow tool do? +

Create a new workflow in n8n. Args: - name (string): Workflow name - nodes (array): Array of node objects (n8n node definitions) - connections (object): Node connection map - settings (object?): Workflow settings - active (boolean): Whether to activate immediately (default false) Returns: Created workflow with its ID. 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_workflow? +

Register the n8n MCP Server MCP server in PolicyLayer and add a rule for n8n_create_workflow: 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_workflow? +

n8n_create_workflow is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit n8n_create_workflow? +

Yes. Add a rate_limit block to the n8n_create_workflow 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_workflow completely? +

Set action: deny in the PolicyLayer policy for n8n_create_workflow. 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_workflow? +

n8n_create_workflow is provided by the n8n MCP Server MCP server (verzth/mcp-n8n). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.