Problem or Use Case

LINE is the dominant messaging platform in Taiwan, Japan, and Thailand. There is currently no way to run Hermes as a LINE bot — users in these markets have no gateway option for their primary messaging app.

Proposed Solution

Add a gateway/platforms/line.py adapter (same pattern as telegram.py) that connects Hermes to the LINE Messaging API via webhook.

Implementation is complete in leepoweii/hermes-agent@feat/line-adapter:

• Webhook server — aiohttp endpoint at /line/webhook with HMAC-SHA256 signature validation
• Allowlist — LINE_ALLOWED_USERS / LINE_ALLOW_ALL_USERS env vars (user/group/room sources)
• Typing indicator — showLoadingAnimation fired immediately on webhook receipt (200 returned before LLM dispatch)
• PENDING/READY/DELIVERED cache — postback Quick Reply button for slow LLM responses (>3s); necessary because LINE's reply token expires in 60 seconds
• Platform registry — hermes-line toolset, Platform.LINE in config + run factory, setup wizard section
• 66 tests across 12 files covering signature validation, cache state machine (PENDING→READY→DELIVERED→ERROR + TTL prune), allowlist, reply client, HTTP endpoint, config parsing, and runner wiring

LINE_CHANNEL_ACCESS_TOKEN=...
LINE_CHANNEL_SECRET=...
LINE_ALLOWED_USERS=U<userId>   # or LINE_ALLOW_ALL_USERS=true

Alternatives Considered

Skill: Not viable. LINE requires a persistent webhook listener for real-time events, HMAC-SHA256 signature validation on every incoming request, and a 60-second reply token state machine. These cannot be done "best effort" via terminal or web_extract — they need Python-level integration in the gateway harness.

Feature Type

Gateway / messaging improvement

Scope

Large (new module or significant refactor)

Contribution

• I'd like to implement this myself and submit a PR