create_data_table · N8n MCP: Risk & Policy

WHAT IT DOES

What create_data_table does on N8n

AI agents use create_data_table to create or update resources in N8n — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your N8n environment.

WHY IT NEEDS A POLICY

Why create_data_table needs a policy

This tool creates new data tables with defined columns, which is a reversible write operation. It does not retrieve data (Read), execute arbitrary code (Execute), delete data permanently (Destructive), or involve financial transactions (Financial).

From the tool's definition Tool name 'create_data_table' and description 'Create a new data table' indicate a creation operation that modifies the system state by adding new persistent data structures.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_data_table Rate-limited

create_data_table 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_data_table": {
      "limits": [
        {
          "counter": "create_data_table_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, so you can run agents against it safely.

FAQ

Questions about create_data_table

What does the create_data_table tool do? +

Create a new data table. Columns need 'name' and 'type' (string/number/boolean/dateTime). It is categorised as a Write tool in the N8n 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_data_table? +

Register the N8n MCP server in PolicyLayer and add a rule for create_data_table: 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. Nothing to install.

What risk level is create_data_table? +

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

Can I rate-limit create_data_table? +

Yes. Add a rate_limit block to the create_data_table 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_data_table completely? +

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

create_data_table is provided by the N8n MCP server (siddharth0903/n8n-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.