copy_channel_permissions

THE RISK

Medium Risk

Why copy_channel_permissions needs a policy

This tool modifies permissions on a Discord channel by replacing existing permission overwrites. While permissions are not data in the traditional sense, modifying them is a configuration change that affects who can access resources. This is reversible (permissions can be changed again), so it does not qualify as Destructive.

From the tool's definition The tool description states it will "Copy all permission overwrites from one channel to another, replacing the target channel". The word "replacing" indicates the target channel's existing permissions are overwritten/modified.

Documented attack patterns abuse exactly the kind of access copy_channel_permissions gives an agent:

POLICY

How to control copy_channel_permissions

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 copy_channel_permissions:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "copy_channel_permissions": {
      "limits": [
        {
          "counter": "copy_channel_permissions_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

copy_channel_permissions 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.

Create a free account and register Discord — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Discord tools

Destructive bulk_delete_messages Delete multiple messages from a channel at once (2-100 messages). Only works on messages l Destructive delete_automod_rule Delete an auto-moderation rule from the Discord server. Destructive delete_channel Delete a channel from the Discord server. Channel name is fuzzy-matched. Destructive delete_command Delete an application (slash) command. Destructive delete_emoji Remove a custom emoji from the server by name or ID. Destructive delete_event Delete a scheduled event from the Discord server. Destructive delete_forum_tag Remove a tag from a forum channel. Destructive delete_integration Remove an integration from the server by its ID.

All 139 Discord tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about copy_channel_permissions

What does the copy_channel_permissions tool do? +

Copy all permission overwrites from one channel to another, replacing the target channel\. 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.

How do I enforce a policy on copy_channel_permissions? +

Register the Discord MCP server in PolicyLayer and add a rule for copy_channel_permissions: 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.

What risk level is copy_channel_permissions? +

copy_channel_permissions is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit copy_channel_permissions? +

Yes. Add a rate_limit block to the copy_channel_permissions 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.

How do I block copy_channel_permissions completely? +

Set action: deny in the PolicyLayer policy for copy_channel_permissions. 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.

What MCP server provides copy_channel_permissions? +

copy_channel_permissions 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.

Enforce policy on every Discord tool call.

Start from Discord, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →