users_admin_invite · Slack MCP: Risk & Policy

WHAT IT DOES

What users_admin_invite does on Slack

AI agents use users_admin_invite 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 users_admin_invite needs a policy

This tool creates a new user account and assigns admin privileges, which is a reversible but consequential data modification. It does not delete data (not Destructive), does not directly move money (not Financial), and does not execute arbitrary code (not Execute). However, granting admin access is a high-severity action because it grants broad permissions that could enable further compromise.

From the tool's definition Tool name contains 'invite' and description states 'Invite a user to the workspace as admin'. This creates a new user account with elevated privileges in the workspace.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

users_admin_invite Rate-limited

users_admin_invite 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": {
    "users_admin_invite": {
      "limits": [
        {
          "counter": "users_admin_invite_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 users_admin_invite

What does the users_admin_invite tool do? +

Invite a user to the workspace as admin (legacy undocumented). 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 users_admin_invite? +

Register the Slack MCP server in PolicyLayer and add a rule for users_admin_invite: 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 users_admin_invite? +

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

Can I rate-limit users_admin_invite? +

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

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

users_admin_invite 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.