TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD

Adds an attachment to a Trello card by idCard; specify either a file to upload or a url to link, but not both.

SERVERTrello SOURCEmcp-server-trello

Medium RISK CLASS

Category Write

Parameters 50 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-attachments-by-id-card.md

WHAT IT DOES

What TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD does on Trello

AI agents use TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD 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
`url`	string	—	URL of an external resource to attach if not uploading a `file`. Must start with 'http://' or 'https://'.
`file`	string	—	Path to the local file to attach if not linking a `url`.
`name`	string	—	Desired name for the attachment. If omitted, Trello uses the original filename or a URL-derived default. Max length 256.
`idCard`	string	—	ID or shortLink of the Trello card.
`mimeType`	string	—	MIME type of the attachment, aiding Trello in file handling. Max length 256.

Parameters from the server's own tool schema.

RISK

Why TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD is rated Medium

This tool creates new attachment data on a Trello card. While reversible (attachments can be removed), it modifies the state of a Trello card and could clutter or deface boards if misused by an agent. It is Write-category because it adds data without permanent destruction.

From the tool's definition Tool description states it 'Adds an attachment to a Trello card', which creates and modifies card data. The TRELLO_ADD prefix and 'Adds' verb confirm this is a creation/modification action, not retrieval or deletion.

Risk signalsAccepts URL/endpoint input (url) · Accepts file system path (file)

Attacks that exploit this kind of access

RECOMMENDED RULE

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

TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD Rate-limited

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

FAQ

Questions about TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD

What does the TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD tool do? +

Adds an attachment to a Trello card by idCard; specify either a file to upload or a url to link, but not both. 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_ATTACHMENTS_BY_ID_CARD accept? +

TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD accepts 5 parameters: url, file, name, idCard, mimeType. 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_ATTACHMENTS_BY_ID_CARD? +

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

What risk level is TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD? +

TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD 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_ATTACHMENTS_BY_ID_CARD? +

Yes. Add a rate_limit block to the TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_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 TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD completely? +

Set action: deny in the PolicyLayer policy for TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_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 TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD? +

TRELLO_ADD_CARDS_ATTACHMENTS_BY_ID_CARD 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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