Feishu Audio Message Skill

This skill enables sending voice messages (not file attachments) to Feishu/Lark users via the Open API.

When to Use

Use this skill when:

• User wants to send a voice message to Feishu
• User wants to convert and send audio (MP3, WAV, etc.) as a voice message
• User specifies they want audio message, not file upload

Requirements

1. ffmpeg - Required for audio conversion to OPUS format
2. Node.js 18+ - For running the send script
3. Feishu App Credentials:
   • App ID
   • App Secret
   • Target user's Open ID

How It Works

1. Convert audio to OPUS - Feishu requires audio in OPUS format
2. Upload audio file - Upload to Feishu with file_type: opus and duration
3. Send audio message - Send with msg_type: audio

Usage

Step 1: Convert Audio to OPUS

ffmpeg -i input.mp3 -c:a libopus -b:a 32k output.opus

Step 2: Get Audio Duration

ffprobe -v quiet -show_format -print_format json input.mp3
# Look for "duration" field in output

Step 3: Run the Script

node scripts/send-voice.mjs \
  --app-id "cli_xxx" \
  --app-secret "xxx" \
  --user-id "ou_xxx" \
  --audio-file "audio.opus" \
  --duration 3480

Or use environment variables:

export FEISHU_APP_ID="cli_xxx"
export FEISHU_APP_SECRET="xxx"
node scripts/send-voice.mjs --user-id "ou_xxx" --audio-file "audio.opus" --duration 3480

API Details

1. Get Tenant Access Token

POST https://open.feishu.cn/open-apis/auth/v3/tenant_access_token/internal

2. Upload Audio File

POST https://open.feishu.cn/open-apis/im/v1/files
Content-Type: multipart/form-data

file_type: opus
file_name: voice.opus
duration: <milliseconds>
file: <binary>

3. Send Audio Message

POST https://open.feishu.cn/open-apis/im/v1/messages?receive_id_type=open_id

{
  "receive_id": "ou_xxx",
  "msg_type": "audio",
  "content": "{\"file_key\":\"file_v3_xxx\"}"
}

Important Notes

• Audio MUST be OPUS format - MP3/WAV will fail
• Duration is in milliseconds
• The app must have Bot capability enabled
• Rate limit: 5 QPS per user/chat

Example Output

🎤 开始发送语音消息到飞书...

📁 音频文件: /path/to/voice.opus
⏱️  时长: 3480ms

✅ 获取 Tenant Access Token 成功
✅ 上传语音文件成功, file_key: file_v3_00uh_xxx
✅ 发送语音消息成功!
消息 ID: om_x100b5731827e6ca4b10d48c15dfa3ab

🎉 完成！

Troubleshooting