AI agents use line_reply_message to create or update resources in UnClick — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your UnClick environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
message | string | — | Convenience: single text message to reply with |
messages | object | — | Array of LINE message objects (max 5), or use message for a single text reply |
reply_token | string | Yes | |
channel_access_token | string | Yes |
Parameters from the server's own tool schema.
This tool sends a message reply on the LINE messaging platform. It creates/sends new message content, which is a write operation. It is reversible in the sense that messages can be deleted, though delivery cannot be unsent. The blast radius is medium — an AI agent could send unwanted or harmful messages to users, but it does not delete data or move money.
From the tool's definition Reply to a LINE message using a reply token from a webhook event
Attacks that exploit this kind of access
Reply to a LINE message using a reply token from a webhook event. It is categorised as a Write tool in the UnClick MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
line_reply_message accepts 4 parameters: message, messages, reply_token, channel_access_token. Required: reply_token, channel_access_token. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for line_reply_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 UnClick. Nothing to install.
line_reply_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 line_reply_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 line_reply_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.
line_reply_message is provided by the UnClick MCP server (@unclick/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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