add_label_to_card

Add a label to a Trello card.

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/add-label-to-card.md

WHAT IT DOES

What add_label_to_card does on Trello MCP Server

AI agents use add_label_to_card 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 add_label_to_card is rated Medium

Adding a label to a card modifies card metadata reversibly without deleting data or executing arbitrary code. The operation can be undone by removing the label. While the server supports destructive operations (archive_list, implied delete capabilities), this specific tool only adds metadata. Blast radius is minimal—misuse would result in mislabeled cards, easily corrected.

From the tool's definition Tool description states 'Add a label to a Trello card,' which is a create/modify operation. Server description confirms 'full CRUD operations' and 'card movement' capabilities.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_label_to_card 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 add_label_to_card, this is the rule to start with:

add_label_to_card Rate-limited

add_label_to_card 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_to_card": {
      "limits": [
        {
          "counter": "add_label_to_card_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 add_label_to_card call is checked against it from then on.

FAQ

Questions about add_label_to_card

What does the add_label_to_card tool do? +

Add a label to a Trello card. 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_to_card? +

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

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

Can I rate-limit add_label_to_card? +

Yes. Add a rate_limit block to the add_label_to_card 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_to_card completely? +

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

add_label_to_card 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.

KEEP EXPLORING

More on Trello MCP Server, and thousands of servers like it.

This server

All 41 Trello MCP Server tools →

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add-tag on Kanban MCP Server →kb_add on Persistent Kb →create-label on Meme MCP Server →add_video on Mcptube Vision → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →