[BUG] Voice mode on Linux only transcribes first ~2 words before cutting off

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Description

Voice mode (/voice) only captures approximately the first two words of speech, then stops transcribing as if the recording ended. This happens consistently regardless of speaking pace or volume.

## Environment

• Claude Code version: 2.1.75
• OS: NixOS 25.11 (build 25.11.20260304.fabb8c9), kernel 6.12.74
• Audio: PipeWire 1.4.9 (default clock rate: 48000 Hz)
• Microphone: Working correctly in all other applications

## Steps to reproduce

1. Start Claude Code
2. Enter /voice to enable voice mode
3. Hold Space and speak a full sentence
4. Release Space
5. Only the first ~2 words are transcribed

## Expected behavior

The full spoken sentence should be transcribed.

## Actual behavior

Only the first ~2 words are captured. The rest of the speech is lost, suggesting the Voice Activity Detection (VAD) triggers an early cutoff.

## Additional context

• PipeWire configuration is standard (48000 Hz sample rate)
• The microphone works correctly in other applications
• This may be related to how VAD interacts with PipeWire on Linux

What Should Happen?

The full spoken sentence should be transcribed.

Error Messages/Logs

Only the first ~2 words are captured. The rest of the speech is lost, suggesting the Voice Activity Detection (VAD) triggers an early cutoff.

Steps to Reproduce

1. Start Claude Code
2. Enter /voice to enable voice mode
3. Hold Space and speak a full sentence
4. Release Space
5. Only the first ~2 words are transcribed

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.75

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

Other

Additional Information

• PipeWire configuration is standard (48000 Hz sample rate)
• The microphone works correctly in other applications
• This may be related to how VAD interacts with PipeWire on Linux