create_group_chat · Bluebubbles MCP: Risk & Policy

WHAT IT DOES

What create_group_chat does on Bluebubbles

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

WHY IT NEEDS A POLICY

Why create_group_chat needs a policy

This tool creates new chat entities and writes messages, which are reversible operations (chats and messages can be deleted via sibling tools like delete_chat and delete_message). It does not execute arbitrary code, delete data irreversibly, or move financial value. Medium severity reflects that misuse could spam contacts or create unwanted group chats, but the impact is limited and reversible.

From the tool's definition Tool description states 'Create a new group chat' and 'send the first message' — both are creation/modification actions that create new data structures (chat) and add content (message) without permanent deletion or irreversible destruction.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_group_chat Rate-limited

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": {
    "create_group_chat": {
      "limits": [
        {
          "counter": "create_group_chat_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 Bluebubbles, so you can run agents against it safely.

FAQ

Questions about create_group_chat

What does the create_group_chat tool do? +

Create a new group chat with several people and send the first message. It is categorised as a Write tool in the Bluebubbles MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_group_chat? +

Register the Bluebubbles MCP server in PolicyLayer and add a rule for 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 Bluebubbles. Nothing to install.

What risk level is create_group_chat? +

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 create_group_chat? +

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

Set action: deny in the PolicyLayer policy for 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 create_group_chat? +

create_group_chat is provided by the Bluebubbles MCP server (metaember/bluebubbles-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.