download_attachment

A read tool on the Trello MCP server.

SERVERTrello MCP Server SOURCEabdwyer/trellomcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/abdwyer-trellomcp/download-attachment.md

WHAT IT DOES

What download_attachment does on Trello MCP Server

AI agents call download_attachment to retrieve information from Trello MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why download_attachment is rated Low

The tool downloads/retrieves an attachment from a Trello card with no side effects. Although the description is empty, the name strongly suggests a read operation (download = fetch/retrieve). The context of a Trello integration confirms this is data retrieval. No destructive, financial, or execution risk is present.

From the tool's definition Tool name 'download_attachment' indicates retrieval of an attachment without modification. Sibling tools include create, add, and archive operations, positioning download_attachment as a read operation in the CRUD spectrum.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs download_attachment safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Trello MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For download_attachment, this is the rule to start with:

download_attachment Allowed

download_attachment is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "download_attachment": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Trello MCP Server, apply this rule, and every download_attachment call is checked against it from then on.

FAQ

Questions about download_attachment

What does the download_attachment tool do? +

download_attachment is a read tool on the Trello MCP Server MCP server. It is categorised as a Read tool in the Trello MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on download_attachment? +

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

download_attachment is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit download_attachment? +

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

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

download_attachment is provided by the Trello MCP Server MCP server (abdwyer/trellomcp). 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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