add_role · Discord MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_role does on Discord MCP Server

AI agents use add_role to create or update resources in Discord MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Discord MCP Server environment.

WHY IT NEEDS A POLICY

Why add_role needs a policy

Adding a role is a write operation that modifies Discord member attributes and permissions. It is reversible (roles can be removed), so it does not qualify as Destructive.

From the tool's definition Tool description states 'Add a role to a user' — this modifies user permissions and group membership within Discord, which is a reversible write operation. The server description confirms role management capabilities.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_role Rate-limited

add_role 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": {
    "add_role": {
      "limits": [
        {
          "counter": "add_role_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 MCP Server, so you can run agents against it safely.

FAQ

Questions about add_role

What does the add_role tool do? +

Add a role to a user. It is categorised as a Write tool in the Discord MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_role? +

Register the Discord MCP Server MCP server in PolicyLayer and add a rule for add_role: 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 MCP Server. Nothing to install.

What risk level is add_role? +

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

Can I rate-limit add_role? +

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

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

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