Download a Trello card attachment file to a specified local path. Accepts a trello:// resource URI and downloads the file content to the given file path.
AI agents call downloadFileAttachment 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 retrieves/downloads existing attachment data from Trello cards without creating, modifying, deleting, or executing any operations. It is a read-only operation with minimal blast radius—at worst, it could expose sensitive files already stored in Trello, but does not modify or delete data, nor trigger external operations beyond file I/O.
From the tool's definition Tool name 'downloadFileAttachment' and description 'Download a Trello card attachment file to a specified local path' indicates retrieval of data with no modification to Trello state.
Attacks that exploit this kind of access
Download a Trello card attachment file to a specified local path. Accepts a trello:// resource URI and downloads the file content to the given file 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 downloadFileAttachment: 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.
downloadFileAttachment 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 downloadFileAttachment 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 downloadFileAttachment. 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.
downloadFileAttachment 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 →