discord_create_webhook · Discord MCP: Risk & Policy

WHAT IT DOES

What discord_create_webhook does on Discord

AI agents use discord_create_webhook 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.

WHY IT NEEDS A POLICY

Why discord_create_webhook needs a policy

discord_create_webhook is a Write operation: it creates a new webhook resource that persists. While the tool itself does not destructively delete data or move money, the high severity reflects that: (1) the returned token is a credential that grants impersonation rights to post messages as the webhook without further authentication, (2) token exposure could enable an attacker to impersonate the webhook source within…

From the tool's definition Tool description states: 'Create a webhook on a channel and return its ID and token.' This action creates a new resource (webhook).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

discord_create_webhook Rate-limited

discord_create_webhook 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Discord, so you can run agents against it safely.

FAQ

Questions about discord_create_webhook

What does the discord_create_webhook tool do? +

Create a webhook on a channel and return its ID and token. SECURITY: the returned token grants anyone the ability to post as this webhook without authentication — treat it as a secret. Requires the Manage Webhooks permission. Use the returned id+token with discord_send_webhook_message. 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 discord_create_webhook? +

Register the Discord MCP server in PolicyLayer and add a rule for discord_create_webhook: 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 discord_create_webhook? +

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

Can I rate-limit discord_create_webhook? +

Yes. Add a rate_limit block to the discord_create_webhook 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 discord_create_webhook completely? +

Set action: deny in the PolicyLayer policy for discord_create_webhook. 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 discord_create_webhook? +

discord_create_webhook is provided by the Discord MCP server (@pasympa/discord-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.