list_stage_instances

THE RISK

Low Risk

Why list_stage_instances needs a policy

The tool retrieves and returns information about stage instances (topic, channel, privacy level) without creating, modifying, deleting, or executing any actions. It is a read-only information gathering operation with minimal blast radius if misused by an AI agent.

From the tool's definition Tool name 'list_stage_instances' and description 'List all active stage instances' - this is a query/retrieval operation with no modification or side effects.

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

POLICY

How to control list_stage_instances

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_stage_instances:

policy.json

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

list_stage_instances 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

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 →

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_stage_instances

What does the list_stage_instances tool do? +

List all active stage instances in the Discord server. Returns details including topic, channel, and privacy level. 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_stage_instances? +

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

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

Can I rate-limit list_stage_instances? +

Yes. Add a rate_limit block to the list_stage_instances 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_stage_instances completely? +

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

list_stage_instances 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 →