line_broadcast · UnClick MCP: Risk & Policy

WHAT IT DOES

What line_broadcast does on UnClick

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

PARAMETERS

Parameter	Type	Required	Description
`message`	string	Yes
`channel_access_token`	string	Yes

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why line_broadcast needs a policy

This tool sends a message to ALL followers of a LINE Official Account simultaneously. While not irreversible in the destructive sense, it is a mass communication action that cannot be undone once sent.

From the tool's definition Broadcast a text message to all followers of your LINE Official Account

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

line_broadcast Rate-limited

line_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": {
    "line_broadcast": {
      "limits": [
        {
          "counter": "line_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 UnClick, so you can run agents against it safely.

FAQ

Questions about line_broadcast

What does the line_broadcast tool do? +

Broadcast a text message to all followers of your LINE Official Account. It is categorised as a Write tool in the UnClick MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does line_broadcast accept? +

line_broadcast accepts 2 parameters: message, channel_access_token. Required: message, channel_access_token. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on line_broadcast? +

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

What risk level is line_broadcast? +

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

Can I rate-limit line_broadcast? +

Yes. Add a rate_limit block to the line_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 line_broadcast completely? +

Set action: deny in the PolicyLayer policy for line_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 line_broadcast? +

line_broadcast is provided by the UnClick MCP server (@unclick/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.