Follow an announcement channel so its published messages are cross-posted to a target channel in this server.
AI agents use follow_announcement_channel to create or update resources in Discord — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Discord environment.
This tool creates new forwarded/cross-posted messages in a target channel whenever announcements are published. While it doesn't delete or destroy data (hence not Destructive), and doesn't execute arbitrary code (hence not Execute), it does modify the server state by establishing a persistent cross-posting relationship and creating new message records.
From the tool's definition The tool follows an announcement channel and causes its published messages to be 'cross-posted to a target channel'. Cross-posting creates new message objects in the target channel, which is a reversible create/modify operation.
Documented attack patterns abuse exactly the kind of access follow_announcement_channel gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Discord, and nothing reaches the server without passing your rules. This is the rule we recommend for follow_announcement_channel:
{
"version": "1",
"default": "deny",
"tools": {
"follow_announcement_channel": {
"limits": [
{
"counter": "follow_announcement_channel_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}follow_announcement_channel stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Follow an announcement channel so its published messages are cross-posted to a target channel in this server. It is categorised as a Write tool in the Discord MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Discord MCP server in PolicyLayer and add a rule for follow_announcement_channel: 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 Discord. Nothing to install.
follow_announcement_channel 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 follow_announcement_channel 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 follow_announcement_channel. 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.
follow_announcement_channel is provided by the Discord MCP server (hardheadhackerhead/discord-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Discord, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
139 Discord tools catalogued and risk-classified — across an index of 43,000+ MCP servers.