Get a specific attachment from a Trello card. If the attachment is a file (isUpload=true), the url property contains a trello:// resource URI that can be used with the downloadFileAttachment tool to download the file to a local path.
AI agents call getAttachmentOnCard 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 performs a read-only operation—it retrieves and returns data about an attachment without modifying, deleting, or executing any actions. It is a data retrieval function with no side effects, fitting the 'Read' category.
From the tool's definition The tool 'getAttachmentOnCard' retrieves a specific attachment from a Trello card. The description explicitly states it 'Get[s] a specific attachment' and provides information about the attachment, including its properties (isUpload, url).
Attacks that exploit this kind of access
Get a specific attachment from a Trello card. If the attachment is a file (isUpload=true), the url property contains a trello:// resource URI that can be used 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 getAttachmentOnCard: 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.
getAttachmentOnCard 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 getAttachmentOnCard 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 getAttachmentOnCard. 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.
getAttachmentOnCard 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.
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