create_variable

A write tool on the n8n MCP server.

SERVERn8n MCP Server SOURCEandhit-r/n8n-mcp

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/andhit-r-n8n-mcp/create-variable.md

WHAT IT DOES

What create_variable does on n8n MCP Server

AI agents use create_variable 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.

RISK

Why create_variable is rated Medium

This tool creates a new variable, a reversible data creation operation. It does not delete, execute code, move money, or query data. Severity is medium because variables in workflow systems can affect automation behavior; misconfiguration could trigger unintended workflows or expose secrets if mishandled, but the action itself is reversible (variables can be deleted via delete_variable).

From the tool's definition Tool named 'create_variable' with no description. Context from sibling tools and server description indicates this creates variables in an n8n workflow management system.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_variable safely

PolicyLayer is an MCP gateway: it sits between your AI agents and n8n MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_variable, this is the rule to start with:

create_variable Rate-limited

create_variable 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_variable": {
      "limits": [
        {
          "counter": "create_variable_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 n8n MCP Server, apply this rule, and every create_variable call is checked against it from then on.

FAQ

Questions about create_variable

What does the create_variable tool do? +

create_variable is a write tool on the n8n MCP Server MCP server. 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 create_variable? +

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

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

Can I rate-limit create_variable? +

Yes. Add a rate_limit block to the create_variable 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_variable completely? +

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

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

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