dnd_end_dnd · Slack MCP: Risk & Policy

WHAT IT DOES

What dnd_end_dnd does on Slack

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

WHY IT NEEDS A POLICY

Why dnd_end_dnd needs a policy

This tool modifies a user's Do Not Disturb status, which is a reversible write operation. It's not destructive (the prior DND state is not permanently lost), not financial, and not execute in the sense of arbitrary code/commands.

From the tool's definition Tool name 'dnd_end_dnd' and description 'End the current user's Do Not Disturb session' indicates a modification of user status/preferences. This is a reversible state change that affects the user's communication settings.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

dnd_end_dnd Rate-limited

dnd_end_dnd 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": {
    "dnd_end_dnd": {
      "limits": [
        {
          "counter": "dnd_end_dnd_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 Slack, so you can run agents against it safely.

FAQ

Questions about dnd_end_dnd

What does the dnd_end_dnd tool do? +

End the current user's Do Not Disturb session. It is categorised as a Write tool in the Slack MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on dnd_end_dnd? +

Register the Slack MCP server in PolicyLayer and add a rule for dnd_end_dnd: 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 Slack. Nothing to install.

What risk level is dnd_end_dnd? +

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

Can I rate-limit dnd_end_dnd? +

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

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

dnd_end_dnd is provided by the Slack MCP server (karbassi/slack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.