teams_create_group_chat · Teams MCP Server MCP

WHAT IT DOES

What teams_create_group_chat does on Teams MCP Server

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

WHY IT NEEDS A POLICY

Why teams_create_group_chat needs a policy

This tool creates new group chats, which is a reversible write operation. While it establishes new communication channels and automatically includes the user as a member, the action can be undone (the chat can be deleted). It does not execute arbitrary code, delete data irreversibly, or move money.

From the tool's definition Tool description states 'Create a new group chat' - the word 'Create' indicates data creation. Returns a conversation ID that can be used with teams_send_message, establishing persistent new communication channels.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

teams_create_group_chat Rate-limited

teams_create_group_chat 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": {
    "teams_create_group_chat": {
      "limits": [
        {
          "counter": "teams_create_group_chat_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 Teams MCP Server, so you can run agents against it safely.

FAQ

Questions about teams_create_group_chat

What does the teams_create_group_chat tool do? +

Create a new group chat with multiple people. Returns a conversation ID for use with teams_send_message. You are automatically included as a member. For 1:1 chats, use teams_get_chat instead. It is categorised as a Write tool in the Teams 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 teams_create_group_chat? +

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

What risk level is teams_create_group_chat? +

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

Can I rate-limit teams_create_group_chat? +

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

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

teams_create_group_chat is provided by the Teams MCP Server MCP server (m0nkmaster/msteams-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.