add_cards_to_list

Add multiple cards to a list in one operation. Cards are created sequentially (Trello API does not support batch writes). Rate limiting is handled automatically.

SERVERTrello SOURCE@delorenj/mcp-server-trello

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/io-github-delorenj-mcp-server-trello/add-cards-to-list.md

WHAT IT DOES

What add_cards_to_list does on Trello

AI agents use add_cards_to_list 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.

RISK

Why add_cards_to_list is rated Medium

This tool creates new Trello cards, which is a reversible modification of data (cards can be deleted/archived). It does not execute arbitrary code, move money, or permanently destroy data. The severity is medium rather than low because creating multiple cards in sequence could meaningfully alter a board's state and require cleanup effort if misused by an AI agent.

From the tool's definition Tool description explicitly states it 'Add multiple cards to a list' and 'Cards are created sequentially', indicating reversible creation of data.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

add_cards_to_list Rate-limited

add_cards_to_list 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_cards_to_list": {
      "limits": [
        {
          "counter": "add_cards_to_list_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 add_cards_to_list call is checked against it from then on.

FAQ

Questions about add_cards_to_list

What does the add_cards_to_list tool do? +

Add multiple cards to a list in one operation. Cards are created sequentially (Trello API does not support batch writes). Rate limiting is handled automatically. 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.

How do I enforce a policy on add_cards_to_list? +

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

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

Can I rate-limit add_cards_to_list? +

Yes. Add a rate_limit block to the add_cards_to_list 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_cards_to_list completely? +

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

add_cards_to_list is provided by the Trello MCP server (@delorenj/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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