set_rich_menu_default

THE RISK

Medium Risk

Why set_rich_menu_default needs a policy

This tool creates or modifies account configuration by setting a default UI element (rich menu). While reversible (can be changed or unset), it affects the user experience for all account followers and represents a Write operation. Severity is medium because misconfiguration could degrade user experience but does not delete data, execute arbitrary code, or involve financial transactions.

From the tool's definition The tool description states 'Set a rich menu as the default rich menu', which modifies the configuration/state of the LINE Official Account. The sibling tools include create, delete, and broadcast operations, confirming this server manages account state.

Documented attack patterns abuse exactly the kind of access set_rich_menu_default gives an agent:

POLICY

How to control set_rich_menu_default

PolicyLayer is an MCP gateway — it sits between your AI agents and Line Bot, and nothing reaches the server without passing your rules. This is the rule we recommend for set_rich_menu_default:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_rich_menu_default": {
      "limits": [
        {
          "counter": "set_rich_menu_default_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

set_rich_menu_default 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.

Create a free account and register Line Bot — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Line Bot tools

Destructive cancel_rich_menu_default Cancel the default rich menu. Destructive delete_rich_menu Delete a rich menu from your LINE Official Account. Write broadcast_flex_message Broadcast a highly customizable flex message via LINE to all users who have added your LIN Write broadcast_text_message Broadcast a simple text message via LINE to all users who have followed your LINE Official Write create_rich_menu Create a rich menu based on the given actions. Generate and upload a rich menu image based Write push_flex_message Push a highly customizable flex message to a user via LINE. Supports both bubble (single c Write push_text_message Push a simple text message to a user via LINE. Use this for sending plain text messages wi Read get_follower_ids Get a list of user IDs of users who have added the LINE Official Account as a friend. This

All 12 Line Bot tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about set_rich_menu_default

What does the set_rich_menu_default tool do? +

Set a rich menu as the default rich menu. It is categorised as a Write tool in the Line Bot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_rich_menu_default? +

Register the Line Bot MCP server in PolicyLayer and add a rule for set_rich_menu_default: 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. Nothing to install.

What risk level is set_rich_menu_default? +

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

Can I rate-limit set_rich_menu_default? +

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

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

set_rich_menu_default is provided by the Line Bot MCP server (@line/line-bot-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Line Bot tool call.

Start from Line Bot, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →