create_emoji · Discord MCP: Risk & Policy

WHAT IT DOES

What create_emoji does on Discord

AI agents use create_emoji 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 create_emoji needs a policy

Creating a custom emoji is a reversible write operation. It adds data to the server without executing arbitrary code, deleting data, or moving money. The blast radius is minimal: emojis are non-critical cosmetic resources that can be deleted if misused. Severity is low because emoji creation does not affect server security, member permissions, or critical functionality.

From the tool's definition Tool name is 'create_emoji' and description states 'Create a custom emoji in a server' — this creates a new resource (emoji) that is stored in the Discord server.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_emoji Rate-limited

create_emoji 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": {
    "create_emoji": {
      "limits": [
        {
          "counter": "create_emoji_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 create_emoji

What does the create_emoji tool do? +

Create a custom emoji in a 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.

How do I enforce a policy on create_emoji? +

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

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

Can I rate-limit create_emoji? +

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

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

create_emoji is provided by the Discord MCP server (scarecr0w12/discord-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.