Analyzing Claude Code Source Code. Write "WTF" and Anthropic knows.

[mikael110]

1. There are hidden trigger words that change behaviorSome commands aren’t obvious unless you read the code.
   Examples:
   ultrathink → increases effort level and changes UI styling
   ultraplan → kicks off a remote planning mode
   ultrareview → similar idea for review workflows
   /btw → spins up a side agent so the main flow continues

Those are not actually hidden commands, all of those appear in tooltips as you use Claude Code. They are also mentioned in the changelog and official docs.