add_node_intent · n8n Workflow Builder MCP: Risk & Policy

WHAT IT DOES

What add_node_intent does on n8n Workflow Builder

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

WHY IT NEEDS A POLICY

Why add_node_intent needs a policy

This tool creates new nodes in n8n workflows, which is a reversible Write operation. It modifies workflow configuration without executing it or permanently deleting data.

From the tool's definition Tool name 'add_node_intent' and description '📝 Add' indicate creation of new workflow nodes. The context of 'n8n Workflow Builder' confirms this modifies workflow structure by adding components.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_node_intent Rate-limited

add_node_intent 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": {
    "add_node_intent": {
      "limits": [
        {
          "counter": "add_node_intent_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 Workflow Builder, so you can run agents against it safely.

FAQ

Questions about add_node_intent

What does the add_node_intent tool do? +

📝 Add. It is categorised as a Write tool in the n8n Workflow Builder MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_node_intent? +

Register the n8n Workflow Builder MCP server in PolicyLayer and add a rule for add_node_intent: 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 Workflow Builder. Nothing to install.

What risk level is add_node_intent? +

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

Can I rate-limit add_node_intent? +

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

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

add_node_intent is provided by the n8n Workflow Builder MCP server (schimmilab/n8n-workflow-builder). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.