TRELLO_ADD_CARDS

Creates a new card in a Trello list; idList is required, and if idCardSource is used, the source card must be accessible.

SERVERTrello SOURCEmcp-server-trello

Medium RISK CLASS

Category Write

Parameters 120 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

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

WHAT IT DOES

What TRELLO_ADD_CARDS does on Trello

AI agents use TRELLO_ADD_CARDS 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
`due`	string	—	Due date for the card (date string or 'null' to remove).
`pos`	string	—	Position in list: 'top', 'bottom', or a positive float.
`desc`	string	—	Card description (0-16384 characters).
`name`	string	—	Name for the new card; required unless `idCardSource` or `urlSource` is used.
`closed`	string	—	Archive (close) the card. Valid values: 'true', 'false'.
`idList`	string	—	Required ID of the list to add the card to.
`labels`	string	—	Comma-separated label colors (e.g., 'blue', 'green') or 'all' for default labels.
`idBoard`	string	—	ID of the board to move the card to; if specified, `idList` must be on this board.
`idLabels`	string	—	Comma-separated list of label IDs (24-char hex) to add.
`idMembers`	string	—	Comma-separated list of member IDs (24-char hex) to assign.
`urlSource`	string	—	URL (http:// or https://) to attach; if a Trello card URL, copies that card. Use 'null' if not needed.
`fileSource`	string	—	Binary data of a file to attach.

Parameters from the server's own tool schema.

RISK

Why TRELLO_ADD_CARDS is rated Medium

This tool creates or modifies data (adding a new card to a Trello board) in a reversible manner. The action is not destructive (data can be deleted), not financial, and not executing arbitrary code. The severity is medium because an AI agent could spam or clutter boards with unwanted cards, but the impact is limited to adding data that can be easily removed.

From the tool's definition Creates a new card in a Trello list

Risk signalsHigh parameter count (16 properties)

Attacks that exploit this kind of access

RECOMMENDED RULE

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

TRELLO_ADD_CARDS Rate-limited

TRELLO_ADD_CARDS 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_CARDS": {
      "limits": [
        {
          "counter": "trello_add_cards_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_CARDS call is checked against it from then on.

FAQ

Questions about TRELLO_ADD_CARDS

What does the TRELLO_ADD_CARDS tool do? +

Creates a new card in a Trello list; idList is required, and if idCardSource is used, the source card must be accessible. 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_CARDS accept? +

TRELLO_ADD_CARDS accepts 12 parameters: due, pos, desc, name, closed, idList, labels, idBoard, idLabels, idMembers, urlSource, fileSource. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on TRELLO_ADD_CARDS? +

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

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

Can I rate-limit TRELLO_ADD_CARDS? +

Yes. Add a rate_limit block to the TRELLO_ADD_CARDS 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_CARDS completely? +

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

TRELLO_ADD_CARDS 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.

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