usergroups_create · Slack MCP: Risk & Policy

WHAT IT DOES

What usergroups_create does on Slack

AI agents use usergroups_create 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 usergroups_create needs a policy

Creating usergroups modifies Slack's organizational structure and access control configuration. While reversible, this can affect team permissions and collaboration settings if misused by an agent. The empty description limits confidence slightly, but the name clearly indicates a Write operation that adds new resources to the system.

From the tool's definition Tool name 'usergroups_create' indicates creation of a new usergroup resource. Server description states it provides 'full access to Slack' including various operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

usergroups_create Rate-limited

usergroups_create 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": {
    "usergroups_create": {
      "limits": [
        {
          "counter": "usergroups_create_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 usergroups_create

What does the usergroups_create tool do? +

usergroups_create. 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 usergroups_create? +

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

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

Can I rate-limit usergroups_create? +

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

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

usergroups_create 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.