stop_typing · Bluebubbles MCP: Risk & Policy

WHAT IT DOES

What stop_typing does on Bluebubbles

AI agents invoke stop_typing to trigger actions in Bluebubbles. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why stop_typing needs a policy

This tool triggers an external operation on the BlueBubbles server to stop a typing indicator in a chat. It doesn't read data, write/create persistent data, or delete anything — it executes an action that affects the state of a chat session (typing indicator). The blast radius is minimal as misuse only affects a UI indicator.

From the tool's definition Stop the typing indicator in a chat

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stop_typing Rate-limited

stop_typing stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "stop_typing": {
      "limits": [
        {
          "counter": "stop_typing_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 stop_typing

What does the stop_typing tool do? +

Stop the typing indicator in a chat. It is categorised as a Execute tool in the Bluebubbles MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on stop_typing? +

Register the Bluebubbles MCP server in PolicyLayer and add a rule for stop_typing: 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 stop_typing? +

stop_typing is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit stop_typing? +

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

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

stop_typing 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.