usergroups_update

A write tool on the Slack MCP server.

SERVERSlack SOURCEkarbassi/slack-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/karbassi-slack-mcp/usergroups-update.md

WHAT IT DOES

What usergroups_update does on Slack

AI agents use usergroups_update 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.

RISK

Why usergroups_update is rated Medium

This tool creates or modifies user group configurations reversibly. While not destructive (groups can be re-updated), it affects organizational structure and access controls, warranting 'Write' category.

From the tool's definition Tool name 'usergroups_update' indicates modification of user group data. On Slack, updating user groups affects membership, permissions, and access controls for multiple users.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs usergroups_update safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Slack, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For usergroups_update, this is the rule to start with:

usergroups_update Rate-limited

usergroups_update 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_update": {
      "limits": [
        {
          "counter": "usergroups_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Slack, apply this rule, and every usergroups_update call is checked against it from then on.

FAQ

Questions about usergroups_update

What does the usergroups_update tool do? +

usergroups_update is a write tool on the Slack MCP server. 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_update? +

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

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

Can I rate-limit usergroups_update? +

Yes. Add a rate_limit block to the usergroups_update 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_update completely? +

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

usergroups_update 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.

KEEP EXPLORING

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aroflo_create_or_update_record on AroFlo MCP →team_manager_update_budget on Team Manager MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →