update_scheduled_message · Bluebubbles MCP: Risk & Policy

WHAT IT DOES

What update_scheduled_message does on Bluebubbles

AI agents use update_scheduled_message 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 update_scheduled_message needs a policy

This tool modifies scheduled message attributes (text, send time, chat) reversibly without deleting data or executing external commands. It falls under Write category as it updates data that can be further modified or undone.

From the tool's definition Tool name 'update_scheduled_message' and description 'Update an existing scheduled message's chat, text, and send time' indicate modification of existing data (scheduled message content and metadata).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_scheduled_message Rate-limited

update_scheduled_message 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": {
    "update_scheduled_message": {
      "limits": [
        {
          "counter": "update_scheduled_message_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 update_scheduled_message

What does the update_scheduled_message tool do? +

Update an existing scheduled message's chat, text, and send time. 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 update_scheduled_message? +

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

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

Can I rate-limit update_scheduled_message? +

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

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

update_scheduled_message 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.