list_labels

List labels defined on a board.

SERVERTrello SOURCEartemnikov/trello-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade B, identity unverified Pull the record →

This record as markdown: /tools/artemnikov-trello-mcp/list-labels.md

WHAT IT DOES

What list_labels does on Trello

AI agents call list_labels to retrieve information from Trello without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_labels is rated Low

This tool queries and returns existing label definitions from a Trello board. It performs no modifications, deletions, or external actions. The operation is read-only and has minimal security impact even if misused by an AI agent, as it only exposes metadata about board labels already known to users with board access.

From the tool's definition Tool name 'list_labels' and description 'List labels defined on a board' indicate a retrieval operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_labels safely

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

list_labels Allowed

list_labels is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_labels": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about list_labels

What does the list_labels tool do? +

List labels defined on a board. It is categorised as a Read tool in the Trello MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_labels? +

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

What risk level is list_labels? +

list_labels is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_labels? +

Yes. Add a rate_limit block to the list_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 list_labels completely? +

Set action: deny in the PolicyLayer policy for list_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 list_labels? +

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

KEEP EXPLORING

More on Trello, and thousands of servers like it.

This server

All 16 Trello tools →

Across the catalogue

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Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →