createLabel · Trello MCP Server MCP: Risk & Policy

WHAT IT DOES

What createLabel does on Trello MCP Server

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

WHY IT NEEDS A POLICY

Why createLabel needs a policy

Creating a label is a reversible write operation that modifies board state by adding metadata for organization. It has no financial impact, does not execute arbitrary code, and is not destructive since labels can be deleted or modified. The blast radius is minimal—labels are organizational metadata with no direct impact on critical data or workflows.

From the tool's definition Tool description states 'Create a new label on a Trello board', indicating a creation operation that adds new data to the board.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createLabel Rate-limited

createLabel 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": {
    "createLabel": {
      "limits": [
        {
          "counter": "createlabel_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 Trello MCP Server, so you can run agents against it safely.

FAQ

Questions about createLabel

What does the createLabel tool do? +

Create a new label on a Trello board. Use this to add categorization and visual organization to your cards. It is categorised as a Write tool in the Trello 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 createLabel? +

Register the Trello MCP Server MCP server in PolicyLayer and add a rule for createLabel: 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 Trello MCP Server. Nothing to install.

What risk level is createLabel? +

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

Can I rate-limit createLabel? +

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

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

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