Fact · Dictation in your apps
Claude Code's docs say /voice is available only while a claude.ai account is your active sign-in, so an unknown /voice command usually means you are not signed in with one.
Checked against its source on October 17, 2026
In the source's own words
“/voice is available only while a claude.ai account is your active sign-in”
Voice dictation (Claude Code documentation), Anthropic, Anthropic, 2026, Troubleshooting.
Open the original- What it measures
- The docs list the message 'Unknown command: /voice' as a symptom of this sign-in requirement, with the fix of running /login.
- What it does not show
- The same message can appear when an API key or provider setting takes precedence, so check that too.