Download attachments from a specific Discord message to the local inbox. Use after fetch_messages shows a message has attachments (marked with +Natt). Returns file paths ready to Read.
AI agents call download_attachment to retrieve information from Cursor Discord Channels without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves files from Discord messages and stores them locally for reading. It has no side effects on Discord data, does not modify or delete anything, and does not execute code or trigger external operations. It is purely a data retrieval operation, fitting the Read category.
From the tool's definition Tool description states it "Download attachments from a specific Discord message to the local inbox" and "Returns file paths ready to Read." The primary action is retrieving/downloading existing attachments with no modification or destructive capability.
Attacks that exploit this kind of access
Download attachments from a specific Discord message to the local inbox. Use after fetch_messages shows a message has attachments (marked with +Natt). Returns file paths ready to Read. It is categorised as a Read tool in the Cursor Discord Channels MCP Server, which means it retrieves data without modifying state.
Register the Cursor Discord Channels 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 Cursor Discord Channels. Nothing to install.
download_attachment 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 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.
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.
download_attachment is provided by the Cursor Discord Channels MCP server (lilyzhng/cursor-discord-channels). 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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