trello_add_attachment_to_card · Trello MCP Server MCP

WHAT IT DOES

What trello_add_attachment_to_card does on Trello MCP Server

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

WHY IT NEEDS A POLICY

Why trello_add_attachment_to_card needs a policy

Adding an attachment creates new data and modifies a card's state, which is a write operation. It is reversible (attachments can be removed) and does not execute code, delete data, or commit financial transactions. Severity is medium because an agent could attach malicious files or inappropriate content to shared boards, but the impact is limited to the targeted card and is easily undone.

From the tool's definition Tool name 'trello_add_attachment_to_card' and description 'Add an attachment to a card' indicate creation of new data (attachment) attached to an existing card. This modifies card state reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

trello_add_attachment_to_card Rate-limited

trello_add_attachment_to_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_attachment_to_card": {
      "limits": [
        {
          "counter": "trello_add_attachment_to_card_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Trello MCP Server, so you can run agents against it safely.

FAQ

Questions about trello_add_attachment_to_card

What does the trello_add_attachment_to_card tool do? +

Add an attachment to a card. It is categorised as a Write tool in the Trello MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on trello_add_attachment_to_card? +

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

What risk level is trello_add_attachment_to_card? +

trello_add_attachment_to_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_attachment_to_card? +

Yes. Add a rate_limit block to the trello_add_attachment_to_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_attachment_to_card completely? +

Set action: deny in the PolicyLayer policy for trello_add_attachment_to_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_attachment_to_card? +

trello_add_attachment_to_card is provided by the Trello MCP Server MCP server (shameerpc5029/trello-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.