Voice mode not available — feature flag tengu_amber_quartz not enabled

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?

The /voice command returns Unknown skill: voice. The command is hidden because the GrowthBook feature flag tengu_amber_quartz is not enabled for my account.

Debugging performed:

• Confirmed the voice command code exists in the binary (v2.1.74)
• The command's isHidden property returns true because $s() → dPT() → Jq("tengu_amber_quartz", false) evaluates to false
• cachedGrowthBookFeatures in ~/.claude/.claude.json did not contain the tengu_amber_quartz flag
• Manually setting the flag to true in the cache is overwritten by the server on startup
• Auth is confirmed: Claude.ai account, Max 20x subscription, valid access token

What Should Happen?

/voice should be available as a command and activate voice mode with push-to-talk.

Steps to Reproduce

1. Run claude (v2.1.74, native macOS build)
2. Type /voice
3. Result: Unknown skill: voice

Claude Code Version

2.1.74

Platform

Claude.ai (Max 20x subscription)

Operating System

macOS (Darwin 25.2.0, MacBook Air M3)

Terminal/Shell

iTerm2 / zsh

Additional Information

Would appreciate being added to the rollout for the tengu_amber_quartz feature flag, or guidance on when voice mode will be generally available for all users.