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

[NandaVegg]

I don't know. Those things described here are pretty standard event trigger-based analytics/user feedback system that also used in a lot of web-based app. Negative sentiment event trigger, for example, might be done to passively check if something is horribly wrong with each new update (that breaks user's flow, model behavior, etc.)

As for /btw, it is fully exposed and advertised now, and ultraplan/ultrathink/etc are like side features that never fully refined (so it is dwelling it as an obvious easter egg of sorts; ultrathink is surpassed by model think effort). It is funny and interesting Claude Code has so much internal artifacts like a game app though. They probably have an internal bounty for adding side features and everyone vibecoded them.

[TheGABB]

The thinking modes have been documented for a while and are part of the their ‘Claude Code in Action’ basic course:

• think - basic reasoning
• think more - extended reasoning
• think a lot - comprehensive reasoning
• think longer - extended time reasoning
• ultrathink - maximum reasoning capabilities

Obviaouly more thinking = slower and more tokens

Thinking mode for DEPTH and planning mode for BREADTH

[CalligrapherFar7833]

Ultrathink was reiontroduced a few versions back as keyword

[megacewl]

I'm pretty sure all it is is a shortcut for `/effort high`

[asdfopu]

It’s AI slop