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LINE

docs/channels/line.md

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LINE connects to OpenClaw via the LINE Messaging API. The plugin runs as a webhook receiver on the gateway and uses your channel access token + channel secret for authentication.

Status: downloadable plugin. Direct messages, group chats, media, locations, Flex messages, template messages, and quick replies are supported. Reactions and threads are not supported.

Install

Install LINE before configuring the channel:

bash
openclaw plugins install @openclaw/line

Local checkout (when running from a git repo):

bash
openclaw plugins install ./path/to/local/line-plugin

Setup

  1. Create a LINE Developers account and open the Console: https://developers.line.biz/console/
  2. Create (or pick) a Provider and add a Messaging API channel.
  3. Copy the Channel access token and Channel secret from the channel settings.
  4. Enable Use webhook in the Messaging API settings.
  5. Set the webhook URL to your gateway endpoint (HTTPS required):
https://gateway-host/line/webhook

The gateway responds to LINE’s webhook verification (GET) and inbound events (POST). If you need a custom path, set channels.line.webhookPath or channels.line.accounts.<id>.webhookPath and update the URL accordingly.

Security note:

  • LINE signature verification is body-dependent (HMAC over the raw body), so OpenClaw applies strict pre-auth body limits and timeout before verification.
  • OpenClaw processes webhook events from the verified raw request bytes. Upstream middleware-transformed req.body values are ignored for signature-integrity safety.

Configure

Minimal config:

json5
{
  channels: {
    line: {
      enabled: true,
      channelAccessToken: "LINE_CHANNEL_ACCESS_TOKEN",
      channelSecret: "LINE_CHANNEL_SECRET",
      dmPolicy: "pairing",
    },
  },
}

Public DM config:

json5
{
  channels: {
    line: {
      enabled: true,
      channelAccessToken: "LINE_CHANNEL_ACCESS_TOKEN",
      channelSecret: "LINE_CHANNEL_SECRET",
      dmPolicy: "open",
      allowFrom: ["*"],
    },
  },
}

Env vars (default account only):

  • LINE_CHANNEL_ACCESS_TOKEN
  • LINE_CHANNEL_SECRET

Token/secret files:

json5
{
  channels: {
    line: {
      tokenFile: "/path/to/line-token.txt",
      secretFile: "/path/to/line-secret.txt",
    },
  },
}

tokenFile and secretFile must point to regular files. Symlinks are rejected.

Multiple accounts:

json5
{
  channels: {
    line: {
      accounts: {
        marketing: {
          channelAccessToken: "...",
          channelSecret: "...",
          webhookPath: "/line/marketing",
        },
      },
    },
  },
}

Access control

Direct messages default to pairing. Unknown senders get a pairing code and their messages are ignored until approved.

bash
openclaw pairing list line
openclaw pairing approve line <CODE>

Allowlists and policies:

  • channels.line.dmPolicy: pairing | allowlist | open | disabled
  • channels.line.allowFrom: allowlisted LINE user IDs for DMs; dmPolicy: "open" requires ["*"]
  • channels.line.groupPolicy: allowlist | open | disabled
  • channels.line.groupAllowFrom: allowlisted LINE user IDs for groups
  • Per-group overrides: channels.line.groups.<groupId>.allowFrom
  • Runtime note: if channels.line is completely missing, runtime falls back to groupPolicy="allowlist" for group checks (even if channels.defaults.groupPolicy is set).

LINE IDs are case-sensitive. Valid IDs look like:

  • User: U + 32 hex chars
  • Group: C + 32 hex chars
  • Room: R + 32 hex chars

Message behavior

  • Text is chunked at 5000 characters.
  • Markdown formatting is stripped; code blocks and tables are converted into Flex cards when possible.
  • Streaming responses are buffered; LINE receives full chunks with a loading animation while the agent works.
  • Media downloads are capped by channels.line.mediaMaxMb (default 10).
  • Inbound media is saved under ~/.openclaw/media/inbound/ before it is passed to the agent, matching the shared media store used by other bundled channel plugins.

Channel data (rich messages)

Use channelData.line to send quick replies, locations, Flex cards, or template messages.

json5
{
  text: "Here you go",
  channelData: {
    line: {
      quickReplies: ["Status", "Help"],
      location: {
        title: "Office",
        address: "123 Main St",
        latitude: 35.681236,
        longitude: 139.767125,
      },
      flexMessage: {
        altText: "Status card",
        contents: {
          /* Flex payload */
        },
      },
      templateMessage: {
        type: "confirm",
        text: "Proceed?",
        confirmLabel: "Yes",
        confirmData: "yes",
        cancelLabel: "No",
        cancelData: "no",
      },
    },
  },
}

The LINE plugin also ships a /card command for Flex message presets:

/card info "Welcome" "Thanks for joining!"

ACP support

LINE supports ACP (Agent Communication Protocol) conversation bindings:

  • /acp spawn <agent> --bind here binds the current LINE chat to an ACP session without creating a child thread.
  • Configured ACP bindings and active conversation-bound ACP sessions work on LINE like other conversation channels.

See ACP agents for details.

Outbound media

The LINE plugin supports sending images, videos, and audio files through the agent message tool. Media is sent via the LINE-specific delivery path with appropriate preview and tracking handling:

  • Images: sent as LINE image messages with automatic preview generation.
  • Videos: sent with explicit preview and content-type handling.
  • Audio: sent as LINE audio messages.

Outbound media URLs must be public HTTPS URLs. OpenClaw validates the target hostname before handing the URL to LINE and rejects loopback, link-local, and private-network targets.

Generic media sends fall back to the existing image-only route when a LINE-specific path is not available.

Troubleshooting

  • Webhook verification fails: ensure the webhook URL is HTTPS and the channelSecret matches the LINE console.
  • No inbound events: confirm the webhook path matches channels.line.webhookPath and that the gateway is reachable from LINE.
  • Media download errors: raise channels.line.mediaMaxMb if media exceeds the default limit.