AI agents use line_set_default_rich_menu to create or update resources in Line Oa Mcp Ultimate — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Line Oa Mcp Ultimate environment.
This tool creates or modifies the default rich menu for a LINE Official Account, which affects how end-users interact with the account. While reversible (can be cleared or changed), it constitutes a Write action with high severity due to potential impact on customer-facing functionality and user experience if misconfigured by an AI agent.
From the tool's definition Tool name 'line_set_default_rich_menu' and description 'Set or clear the OA' indicate modification of Official Account configuration. The action of setting or clearing a rich menu is a reversible write operation that modifies the account's UI/menu structure.
Documented attack patterns abuse exactly the kind of access line_set_default_rich_menu gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Line Oa Mcp Ultimate, and nothing reaches the server without passing your rules. This is the rule we recommend for line_set_default_rich_menu:
{
"version": "1",
"default": "deny",
"tools": {
"line_set_default_rich_menu": {
"limits": [
{
"counter": "line_set_default_rich_menu_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}line_set_default_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.
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Set or clear the OA. It is categorised as a Write tool in the Line Oa Mcp Ultimate MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Line Oa Mcp Ultimate MCP server in PolicyLayer and add a rule for line_set_default_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 Oa Mcp Ultimate. Nothing to install.
line_set_default_rich_menu is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the line_set_default_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.
Set action: deny in the PolicyLayer policy for line_set_default_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.
line_set_default_rich_menu is provided by the Line Oa Mcp Ultimate MCP server (wasintoh/line-oa-mcp-ultimate). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 34 Line Oa Mcp Ultimate tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
34 Line Oa Mcp Ultimate tools catalogued and risk-classified — across an index of 42,500+ MCP servers.