create_label · Mcp Trello MCP: Risk & Policy

WHAT IT DOES

What create_label does on Mcp Trello

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

WHY IT NEEDS A POLICY

Why create_label needs a policy

This tool creates new data (a label) but does not execute code, delete data irreversibly, move money, or perform destructive operations. It is a standard create operation that modifies board configuration reversibly. While it's on a Trello board management server alongside delete operations, the create_label function itself only adds metadata.

From the tool's definition Tool creates a new label on a board, which is a reversible data modification operation. The description explicitly states 'Create a new label', and labels are metadata that can be edited or deleted without cascading destructive effects.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_label Rate-limited

create_label 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_label": {
      "limits": [
        {
          "counter": "create_label_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 Mcp Trello, so you can run agents against it safely.

FAQ

Questions about create_label

What does the create_label tool do? +

Create a new label on a specific board. It is categorised as a Write tool in the Mcp Trello 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_label? +

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

What risk level is create_label? +

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

Can I rate-limit create_label? +

Yes. Add a rate_limit block to the create_label 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_label completely? +

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

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