bulk_invite_users · Slack MCP Server MCP: Risk & Policy

WHAT IT DOES

What bulk_invite_users does on Slack MCP Server

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

WHY IT NEEDS A POLICY

Why bulk_invite_users needs a policy

Bulk inviting users to channels creates or modifies access permissions and channel membership, which is a Write action. It is reversible (users can be removed), so not Destructive. Severity is medium because bulk operations affecting multiple users could disrupt workflows or grant unintended access, but the action is not irreversible and does not involve financial or code execution risks.

From the tool's definition Tool name: 'bulk_invite_users'; description translates to 'Invite multiple users to channel'. This modifies channel membership by adding users—a reversible write operation.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bulk_invite_users Rate-limited

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

FAQ

Questions about bulk_invite_users

What does the bulk_invite_users tool do? +

Convidar múltiplos usuários para canal. It is categorised as a Write tool in the Slack 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 bulk_invite_users? +

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

What risk level is bulk_invite_users? +

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

Can I rate-limit bulk_invite_users? +

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

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

bulk_invite_users is provided by the Slack MCP Server MCP server (will2023a/mcp-slack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.