list_variables

A read tool on the n8n MCP server.

SERVERn8n MCP Server SOURCEandhit-r/n8n-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/andhit-r-n8n-mcp/list-variables.md

WHAT IT DOES

What list_variables does on n8n MCP Server

AI agents call list_variables to retrieve information from n8n MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_variables is rated Low

The 'list_' prefix is a strong indicator of a read operation that queries and returns a collection of items (variables in this case). No side effects are implied. Although the description is empty, the naming convention combined with the tool's position among other n8n management tools strongly suggests this retrieves variable metadata without modification.

From the tool's definition Tool name 'list_variables' with prefix 'list' indicates retrieval of existing data without modification. The sibling tools on this server show a clear pattern: 'create_*', 'delete_*', 'activate/deactivate_*' for write/destructive/execute operations, while…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_variables 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 list_variables, this is the rule to start with:

list_variables Allowed

list_variables is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_variables": {}
  }
}

ALLOW ONLY 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 list_variables call is checked against it from then on.

FAQ

Questions about list_variables

What does the list_variables tool do? +

list_variables is a read tool on the n8n MCP Server MCP server. It is categorised as a Read tool in the n8n MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_variables? +

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

list_variables is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_variables? +

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

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

list_variables 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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