Reply on Discord. Pass chat_id from the inbound message. Optionally pass reply_to (message_id) for threading, thread_id to reply inside a thread, and files (absolute paths) to attach images or other files.
AI agents use reply to create or update resources in Cursor Discord Channels — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Cursor Discord Channels environment.
This tool creates new messages and potentially uploads file attachments to Discord, constituting reversible write operations. While Discord messages can technically be deleted, the primary action is creation/posting.
From the tool's definition Tool 'reply' performs message creation on Discord by posting responses to channels/threads with optional file attachments.
Attacks that exploit this kind of access
Reply on Discord. Pass chat_id from the inbound message. Optionally pass reply_to (message_id) for threading, thread_id to reply inside a thread, and files (absolute paths) to attach images or other files. It is categorised as a Write tool in the Cursor Discord Channels MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Cursor Discord Channels MCP server in PolicyLayer and add a rule for reply: 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.
reply is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the reply 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 reply. 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.
reply 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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