Get all attachments (files, links) for a specific Trello card. For file attachments (isUpload=true), the url property contains a trello:// resource URI that can be used immediately with the downloadFileAttachment tool to download the file to a local path.
AI agents call getAttachmentsOnCard to retrieve information from Trello MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns existing attachment data from a Trello card with no side effects or capability to modify, delete, or create data. It is purely informational retrieval, fitting the Read category. Severity is low as it only accesses metadata about card attachments without ability to modify boards, cards, or financial operations.
From the tool's definition Tool retrieves attachments for a card without modifying data. Description states 'Get all attachments' and the url property is used for downloading, which is a retrieval operation.
Attacks that exploit this kind of access
Get all attachments (files, links) for a specific Trello card. For file attachments (isUpload=true), the url property contains a trello:// resource URI that can be used immediately with the downloadFileAttachment tool to download the file to a local path. It is categorised as a Read tool in the Trello MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Trello MCP Server MCP server in PolicyLayer and add a rule for getAttachmentsOnCard: 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.
getAttachmentsOnCard is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the getAttachmentsOnCard 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.
Set action: deny in the PolicyLayer policy for getAttachmentsOnCard. 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.
getAttachmentsOnCard is provided by the Trello MCP Server MCP server (semblancelabs/trello-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →