conversations_invite · Slack MCP: Risk & Policy

WHAT IT DOES

What conversations_invite does on Slack

AI agents use conversations_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 conversations_invite needs a policy

This tool creates or modifies channel membership by inviting users to conversations. While the description is empty, the name clearly indicates a write operation (invite = add/modify membership). This is reversible (users can be removed later), so it falls under Write rather than Destructive.

From the tool's definition Tool name 'conversations_invite' indicates adding users to Slack conversations/channels. The Slack MCP server description confirms it provides 'full access to Slack: messages, channels, files' and 220 tools.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

conversations_invite Rate-limited

conversations_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": {
    "conversations_invite": {
      "limits": [
        {
          "counter": "conversations_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 conversations_invite

What does the conversations_invite tool do? +

conversations_invite. 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 conversations_invite? +

Register the Slack MCP server in PolicyLayer and add a rule for conversations_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 conversations_invite? +

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

Can I rate-limit conversations_invite? +

Yes. Add a rate_limit block to the conversations_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 conversations_invite completely? +

Set action: deny in the PolicyLayer policy for conversations_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 conversations_invite? +

conversations_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.