dsh-messaging 📨

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Multi-platform messaging plugin for DeepSeek Harness.

One plugin, many IM platforms. Configure once, switch between Feishu/Telegram/Discord/WeCom with capability auto-degradation.

Features

• 🌉 MessagePlatform abstraction — unified interface for all IM platforms
• 🔌 Plugin architecture — each platform is a drop-in adapter
• ⚡ Capability degradation — unsupported features get automatic user-friendly warnings
• 📝 Markdown auto-downgrade — platforms that don't render Markdown (Feishu!) get plain text automatically
• 🔒 Production-hardened — message dedup, per-chat serial processing, token auto-refresh (battle-tested in Hermes Agent 3+ months)

Supported Platforms

❌ = platform doesn't support it → auto-downgrade with user warning
🔨 = platform supports it but not yet implemented in this plugin
🚧 = planned for future releases

Quick Start

# Install into your DSH profile
dsh plugin --profile web add github:andiven/dsh-messaging

# cordis.patch.yml
- id: messaging
  name: '@dsh-messaging/messaging'
  config:
    platform: feishu
    feishu:
      appId: env:FEISHU_APP_ID
      appSecret: env:FEISHU_APP_SECRET
      mode: websocket
    autoConnect: true

Prerequisites

Feishu: Create a self-built app at open.feishu.cn, enable im:message and im:message:send_as_bot permissions, subscribe to im.message.receive_v1 via long connection mode, then publish.

Telegram: Create a bot via @BotFather, get the bot token.

Discord: Create an application at the Discord Developer Portal, add a Bot, enable the Message Content privileged intent, invite it to your server with the bot scope and Send Messages/Read Message History permissions, and grab the bot token.

WeCom: Create a self-built app in the WeCom admin console, note the Corp ID, the app's Secret and AgentId. Receiving messages requires registering an HTTP callback URL (Corp ID, Token, EncodingAESKey) in the console pointing at this plugin's callback server — omit wecom.callback to run send-only.

How It Works

User sends message in Feishu/Telegram
  ↓
Adapter receives event → normalizes to InboundMessage
  ↓
DshBridge calls agent.followup(text)
  ↓
DSH Agent processes (LLM + tools)
  ↓
session/event: assistant/chunk → buffered until turn/end
  ↓
DshBridge sends complete reply via platform.sendMessage()
  ↓
Capability auto-check: Markdown → plain text for Feishu, etc.

Key Features

• CapabilitySet — each platform declares 12 typed capabilities; the agent can query what's possible before acting
• Auto-degradation — unsupported features trigger user-friendly bilingual warnings
• Streaming buffer — assistant text is accumulated and sent as a complete message (not per-token)
• Retry with backoff — exponential backoff + jitter, honors Telegram retry_after / Feishu rate-limit codes
• Per-chat serialization — preserves message ordering within a conversation
• Message dedup — Feishu duplicate events filtered with TTL + cap

Known Limitations

• Feishu media send (image/audio/video/file) not yet implemented (capabilities honestly set to false)
• Telegram/WeCom card messages degrade to formatted text; Discord cards degrade to an embed
• Discord Gateway resume is best-effort (falls back to a fresh Identify on non-resumable close codes)
• WeCom inbound requires an HTTP callback (registered in the WeCom admin console); the proprietary AI-Bot WebSocket gateway is a separate, invite-only product and isn't implemented here
• No reconnection state preservation (queued updates may be lost on restart)
• No test suite yet
• Single platform per instance (config selects one platform)

Development

git clone https://github.com/andiven/dsh-messaging.git
cd dsh-messaging
npm install
npm run build

License

MIT