add-label · Trello MCP Server MCP: Risk & Policy

WHAT IT DOES

What add-label does on Trello MCP Server

AI agents use add-label 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 add-label needs a policy

Adding a label to a card creates or modifies metadata on an existing resource, which is a reversible write operation. It does not execute arbitrary code, delete data irreversibly, or move money. The severity is medium because mislabeling cards at scale could cause organizational confusion or disruption of workflow, but the operation is easily reversible.

From the tool's definition Tool name 'add-label' combined with server description stating it 'Supports...managing labels' indicates a modification operation. The broader server context shows this tool modifies card metadata (labels) on Trello boards.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add-label Rate-limited

add-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": {
    "add-label": {
      "limits": [
        {
          "counter": "add-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 Trello MCP Server, so you can run agents against it safely.

FAQ

Questions about add-label

What does the add-label tool do? +

add-label. 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 add-label? +

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

What risk level is add-label? +

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

Can I rate-limit add-label? +

Yes. Add a rate_limit block to the add-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 add-label completely? +

Set action: deny in the PolicyLayer policy for add-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 add-label? +

add-label is provided by the Trello MCP Server MCP server (praveencs87/trello-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.