n8n_set_workflow_tags · n8n MCP Server MCP: Risk & Policy

WHAT IT DOES

What n8n_set_workflow_tags does on n8n MCP Server

AI agents use n8n_set_workflow_tags 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.

WHY IT NEEDS A POLICY

Why n8n_set_workflow_tags needs a policy

This tool creates or modifies data (workflow tags) in a reversible manner. It does not delete workflows or data (Write vs Destructive), does not execute arbitrary code (Execute), and does not move money (Financial). The severity is medium because tag modifications could affect workflow organization and access control if tags are used for permissions, but the changes are easily reversible by re-applying tags.

From the tool's definition Tool description states 'Replace all tags on a workflow' and 'Pass an empty array to remove all tags.' This modifies workflow metadata by updating tag associations, which is reversible.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

n8n_set_workflow_tags Rate-limited

n8n_set_workflow_tags 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": {
    "n8n_set_workflow_tags": {
      "limits": [
        {
          "counter": "n8n_set_workflow_tags_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 MCP Server, so you can run agents against it safely.

FAQ

Questions about n8n_set_workflow_tags

What does the n8n_set_workflow_tags tool do? +

Replace all tags on a workflow. Pass an empty array to remove all tags. Args: - id (string): Workflow ID - tagIds (array of string): Tag IDs to assign (replaces existing tags). 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 n8n_set_workflow_tags? +

Register the n8n MCP Server MCP server in PolicyLayer and add a rule for n8n_set_workflow_tags: 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 n8n_set_workflow_tags? +

n8n_set_workflow_tags is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit n8n_set_workflow_tags? +

Yes. Add a rate_limit block to the n8n_set_workflow_tags 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 n8n_set_workflow_tags completely? +

Set action: deny in the PolicyLayer policy for n8n_set_workflow_tags. 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 n8n_set_workflow_tags? +

n8n_set_workflow_tags is provided by the n8n MCP Server MCP server (verzth/mcp-n8n). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.