send_broadcast · LineWhiz MCP: Risk & Policy

WHAT IT DOES

What send_broadcast does on LineWhiz

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

WHY IT NEEDS A POLICY

Why send_broadcast needs a policy

This tool creates and delivers messages to a potentially large audience (all friends of the account), making it a Write operation rather than Read. However, it is not Destructive because the messages are not irreversible—they can theoretically be recalled or their effects managed by the platform.

From the tool's definition send_broadcast sends a text message to ALL friends of this LINE OA. This modifies the state of all recipients by delivering a message to them, representing a write operation that affects many users but is reversible.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_broadcast Rate-limited

send_broadcast 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": {
    "send_broadcast": {
      "limits": [
        {
          "counter": "send_broadcast_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 LineWhiz, so you can run agents against it safely.

FAQ

Questions about send_broadcast

What does the send_broadcast tool do? +

Send a text message to ALL friends of this LINE OA. It is categorised as a Write tool in the LineWhiz MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on send_broadcast? +

Register the LineWhiz MCP server in PolicyLayer and add a rule for send_broadcast: 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 LineWhiz. Nothing to install.

What risk level is send_broadcast? +

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

Can I rate-limit send_broadcast? +

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

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

send_broadcast is provided by the LineWhiz MCP server (kinzen-dev/linewhiz). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.