discord_pin_message · Discord MCP: Risk & Policy

WHAT IT DOES

What discord_pin_message does on Discord

AI agents use discord_pin_message 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_pin_message needs a policy

Pinning/unpinning messages is a Write operation because it creates or modifies data reversibly - pinned status is metadata that can be toggled on and off without data loss. While it affects channel presentation and organization (moderate impact), it is not destructive (messages remain intact), not financial, and not arbitrary code execution.

From the tool's definition Tool description states "Pin or unpin a message in a channel, controlled by the pin flag" - this modifies message state (pinned status) which is reversible metadata modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

discord_pin_message Rate-limited

discord_pin_message 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_pin_message": {
      "limits": [
        {
          "counter": "discord_pin_message_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_pin_message

What does the discord_pin_message tool do? +

Pin or unpin a message in a channel, controlled by the pin flag. Requires the Pin Messages permission (a dedicated permission since early 2026, separate from Manage Messages). A channel holds at most 50 pins. Idempotent: pinning an already-pinned message (or unpinning an unpinned one) has no additional effect. 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_pin_message? +

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

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

Can I rate-limit discord_pin_message? +

Yes. Add a rate_limit block to the discord_pin_message 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_pin_message completely? +

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

discord_pin_message 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.