insert_table_rows · N8n MCP: Risk & Policy

WHAT IT DOES

What insert_table_rows does on N8n

AI agents use insert_table_rows 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 insert_table_rows needs a policy

This tool modifies data by inserting new rows into a data table, which is a reversible write operation. The rows can be deleted or modified later. It does not delete data (Destructive), move money (Financial), execute arbitrary code (Execute), or merely read data (Read). The 'write_mode' requirement suggests safety controls are in place.

From the tool's definition Tool description explicitly states 'Insert rows into a data table' and 'Requires write_mode', indicating it creates/adds data reversibly without permanent deletion or financial operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

insert_table_rows Rate-limited

insert_table_rows 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": {
    "insert_table_rows": {
      "limits": [
        {
          "counter": "insert_table_rows_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 insert_table_rows

What does the insert_table_rows tool do? +

Insert rows into a data table. Each row is a dict of column_name: value. Requires write_mode. 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 insert_table_rows? +

Register the N8n MCP server in PolicyLayer and add a rule for insert_table_rows: 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 insert_table_rows? +

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

Can I rate-limit insert_table_rows? +

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

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

insert_table_rows 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.