Lark (Feishu) Voice

Send voice messages on Lark (Feishu) by converting text to speech. Use when the user asks to send a voice message or reply with voice.

Convert text to speech and send as a voice message on Lark (Feishu).

Requirements

• ffmpeg — audio format conversion
• At least one TTS source (skill or built-in tool)

Usage

1. Discover TTS Source

Scan installed skills for names containing tts, and check if the OpenClaw built-in tts tool is available.

• User specified a TTS source → use it directly
• Not specified, only one available → use it directly
• Not specified, multiple available → ask the user to choose
• None available → use the OpenClaw built-in tts tool, and suggest installing a TTS skill for more voice options

2. Generate Audio

Call the selected TTS source to generate an audio file in wav/mp3 or other intermediate format, saved to /tmp/openclaw/.

3. Convert to Opus

Feishu voice messages only support the opus format (OGG container).

ffmpeg -y -i /tmp/openclaw/input.wav -c:a libopus -b:a 24k -ar 24000 -ac 1 /tmp/openclaw/voice.opus

4. Send Voice

Use the message tool to send. The openclaw-lark plugin automatically detects the .opus extension, parses the duration, and delivers it as a msg_type: audio voice bubble.

message(action=send, media="/tmp/openclaw/voice.opus", message="optional text")