set_card_labels

Set all labels on a card, replacing any existing labels.

SERVERTrello MCP Server SOURCEabdwyer/trellomcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/abdwyer-trellomcp/set-card-labels.md

WHAT IT DOES

What set_card_labels does on Trello MCP Server

AI agents use set_card_labels 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.

RISK

Why set_card_labels is rated Medium

This tool modifies card labels on a Trello card, which is a write operation that changes existing data. It is reversible (labels can be changed again), so it does not qualify as Destructive. While it alters card state, the impact is limited to label metadata on a single card, making it Write rather than Execute.

From the tool's definition Tool description states 'Set all labels on a card, replacing any existing labels' - this modifies card metadata by replacing existing labels with new ones, a reversible change operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_card_labels safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Trello MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_card_labels, this is the rule to start with:

set_card_labels Rate-limited

set_card_labels 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": {
    "set_card_labels": {
      "limits": [
        {
          "counter": "set_card_labels_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Trello MCP Server, apply this rule, and every set_card_labels call is checked against it from then on.

FAQ

Questions about set_card_labels

What does the set_card_labels tool do? +

Set all labels on a card, replacing any existing labels. 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 set_card_labels? +

Register the Trello MCP Server MCP server in PolicyLayer and add a rule for set_card_labels: 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 set_card_labels? +

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

Can I rate-limit set_card_labels? +

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

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

set_card_labels is provided by the Trello MCP Server MCP server (abdwyer/trellomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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