list_bans

THE RISK

Low Risk

Why list_bans needs a policy

This tool retrieves and displays existing ban information without modifying, deleting, or executing any actions. It is a read-only operation that gathers data about the current state of bans in the server. The blast radius of misuse is minimal—viewing ban information does not impact server operations or data integrity.

From the tool's definition Tool name is 'list_bans' and description states 'View all banned users in the server along with their ban reasons' — purely a query/retrieval operation with no side effects.

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

POLICY

How to control list_bans

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 list_bans:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_bans": {}
  }
}

list_bans is read-only, so it stays allowed — but 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Discord tools

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All 139 Discord tools →

Read 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_bans

What does the list_bans tool do? +

View all banned users in the server along with their ban reasons. It is categorised as a Read tool in the Discord MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_bans? +

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

list_bans is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_bans? +

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

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

list_bans 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 →