invite_to_group · Tg MCP: Risk & Policy

WHAT IT DOES

What invite_to_group does on Tgmcp

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

WHY IT NEEDS A POLICY

Why invite_to_group needs a policy

This tool creates new associations (adds users to groups) which is reversible through removal, making it a Write operation rather than Destructive. Severity is medium because misuse could add unwanted users to groups (spam, harassment vectors) or expose group membership to unauthorized parties, but the effect is containable through removal.

From the tool's definition Tool invites users to a group or channel, creating new membership relationships. The word 'invite' indicates a write operation that modifies group membership state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

invite_to_group Rate-limited

invite_to_group 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": {
    "invite_to_group": {
      "limits": [
        {
          "counter": "invite_to_group_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 Tgmcp, so you can run agents against it safely.

FAQ

Questions about invite_to_group

What does the invite_to_group tool do? +

Invite users to a group or channel. It is categorised as a Write tool in the Tgmcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on invite_to_group? +

Register the Tg MCP server in PolicyLayer and add a rule for invite_to_group: 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 Tgmcp. Nothing to install.

What risk level is invite_to_group? +

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

Can I rate-limit invite_to_group? +

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

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

invite_to_group is provided by the Tg MCP server (oevortex/tgmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.