push_text_message · LINE Bot MCP Server MCP: Risk & Policy

WHAT IT DOES

What push_text_message does on LINE Bot MCP Server

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

WHY IT NEEDS A POLICY

Why push_text_message needs a policy

This tool creates new data (messages) in a reversible manner - messages can be deleted or recalled by LINE users/admins, making it Write rather than Destructive. It has medium severity because misuse could spam users, disrupt services, or enable social engineering attacks, but individual message sends are not inherently critical compared to broadcast operations or financial transactions.

From the tool's definition push_text_message sends messages to users via LINE Messaging API, which creates/modifies communication state (new message record). The description states it 'Push[es] a simple text message to a user' - a create action that adds data to LINE's messaging system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

push_text_message Rate-limited

push_text_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": {
    "push_text_message": {
      "limits": [
        {
          "counter": "push_text_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 LINE Bot MCP Server, so you can run agents against it safely.

FAQ

Questions about push_text_message

What does the push_text_message tool do? +

Push a simple text message to a user via LINE. Use this for sending plain text messages without formatting. It is categorised as a Write tool in the LINE Bot MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on push_text_message? +

Register the LINE Bot MCP Server MCP server in PolicyLayer and add a rule for push_text_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 LINE Bot MCP Server. Nothing to install.

What risk level is push_text_message? +

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

Can I rate-limit push_text_message? +

Yes. Add a rate_limit block to the push_text_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 push_text_message completely? +

Set action: deny in the PolicyLayer policy for push_text_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 push_text_message? +

push_text_message is provided by the LINE Bot MCP Server MCP server (tndfame/mcp_management). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.