pin_message · Discord MCP Server MCP: Risk & Policy

WHAT IT DOES

What pin_message does on Discord MCP Server

AI agents use pin_message 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 pin_message needs a policy

Pinning a message is a write operation that modifies Discord message state reversibly. It does not execute arbitrary code (Execute), delete data (Destructive), or move money (Financial). While it affects message visibility and organizational state, the action can be undone by unpinning.

From the tool's definition Tool named 'pin_message' with empty description. Based on context of Discord MCP Server managing messages, this tool modifies message state by pinning (marking as important/persistent), which is a reversible change to message metadata.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pin_message Rate-limited

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

FAQ

Questions about pin_message

What does the pin_message tool do? +

pin_message. 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 pin_message? +

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

What risk level is pin_message? +

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

Can I rate-limit pin_message? +

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

Set action: deny in the PolicyLayer policy for 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 pin_message? +

pin_message 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.