create_rich_menu

THE RISK

Medium Risk

Why create_rich_menu needs a policy

This tool creates and uploads new rich menu configurations that become the default UI for account users. It modifies account state reversibly (rich menus can be deleted via delete_rich_menu or replaced via create_rich_menu), so it falls under Write rather than Destructive.

From the tool's definition Tool description states 'Create a rich menu' and 'upload a rich menu image' and 'will be registered as the default'. These are create and modify operations that persistently store UI configuration in the LINE Official Account.

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

POLICY

How to control create_rich_menu

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 create_rich_menu:

policy.json

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

create_rich_menu 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 →

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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 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 Write set_rich_menu_default Set a rich menu as the default rich menu. 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

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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 create_rich_menu

What does the create_rich_menu tool do? +

Create a rich menu based on the given actions. Generate and upload a rich menu image based on the given action. This rich menu will be registered as the default. 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 create_rich_menu? +

Register the Line Bot MCP server in PolicyLayer and add a rule for create_rich_menu: 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 create_rich_menu? +

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

Can I rate-limit create_rich_menu? +

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

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

create_rich_menu 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 →