Push a simple text message to a user via LINE. Use this for sending plain text messages without formatting.
AI agents use push_text_message to create or update resources in Line Bot — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Line Bot environment.
This tool sends (pushes) a text message to a LINE user, which is a Write operation—it creates new data (the message) in the LINE messaging system. It is reversible in the sense that messages can theoretically be recalled or deleted by the service. The severity is medium because unsolicited or spam messages could impact users, but no financial, destructive, or code-execution harm is involved.
From the tool's definition Tool description states 'Push a simple text message to a user via LINE' which is a send/delivery operation that creates a new message record.
Documented attack patterns abuse exactly the kind of access push_text_message gives an agent:
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 push_text_message:
{
"version": "1",
"default": "deny",
"tools": {
"push_text_message": {
"limits": [
{
"counter": "push_text_message_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
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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, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Line Bot 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. Nothing to install.
push_text_message 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 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.
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.
push_text_message 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.
Start from Line Bot, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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12 Line Bot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.