TRELLO_ADD_LISTS

Creates a new list on a specified Trello board, with options to copy an existing list, set its position, initial state (archived/subscribed), and does not modify existing lists or move cards.

SERVERTrello SOURCEmcp-server-trello

Medium RISK CLASS

Category Write

Parameters 60 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/trello/trello-add-lists.md

WHAT IT DOES

What TRELLO_ADD_LISTS does on Trello

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

Parameter	Type	Required	Description
`pos`	string	—	The position of the new list on the board. Valid values are `top`, `bottom`, or a positive number (e.g., '1', '2.5').
`name`	string	—	The name for the new list. Must be a string with a length from 1 to 16384 characters. This is a required parameter.
`closed`	string	—	Indicates whether the list should be created as closed (archived). Set to `true` for closed, or `false` for open.
`idBoard`	string	—	The ID of the board to which the new list should be added. This is a required parameter.
`subscribed`	string	—	Indicates whether the user creating the list should be automatically subscribed to it. Set to `true` to subscribe, or `false` otherwise.
`idListSource`	string	—	The ID of an existing list to copy when creating the new list. If provided, the new list will be a copy of this source list.

Parameters from the server's own tool schema.

RISK

Why TRELLO_ADD_LISTS is rated Medium

This tool creates new data structures (lists) on a Trello board. Creation is reversible—lists can be deleted or archived—making this a Write operation rather than Execute or Destructive. Severity is medium because an agent could create many unwanted lists cluttering a board's organization, but the impact is limited to one workspace and easily recoverable.

From the tool's definition Tool description states it 'Creates a new list' on a Trello board with configurable options (position, archived state, subscription).

Attacks that exploit this kind of access

RECOMMENDED RULE

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

TRELLO_ADD_LISTS Rate-limited

TRELLO_ADD_LISTS 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": {
    "TRELLO_ADD_LISTS": {
      "limits": [
        {
          "counter": "trello_add_lists_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, apply this rule, and every TRELLO_ADD_LISTS call is checked against it from then on.

FAQ

Questions about TRELLO_ADD_LISTS

What does the TRELLO_ADD_LISTS tool do? +

Creates a new list on a specified Trello board, with options to copy an existing list, set its position, initial state (archived/subscribed), and does not modify existing lists or move cards. It is categorised as a Write tool in the Trello MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does TRELLO_ADD_LISTS accept? +

TRELLO_ADD_LISTS accepts 6 parameters: pos, name, closed, idBoard, subscribed, idListSource. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on TRELLO_ADD_LISTS? +

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

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

Can I rate-limit TRELLO_ADD_LISTS? +

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

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

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

KEEP EXPLORING

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