AI Code Tools Digest: Week 7 - Performance Wins & New Commands

# AI Code Tools Digest: Week 7 (Feb 9-15, 2026) ## TL;DR 📊 - **Performance focus**: Claude Code improved startup times, undefined tool fixed memory leaks - **New commands**: Gemini CLI added `/prompt-suggest` for better prompting workflows ## This Week's Releases ### Claude Code (4 releases) Claude's on a roll with **startup performance improvements** by deferring Zod schema construction and better prompt cache hit rates. The team also added **Windows ARM64 support** and new auth CLI commands (`claude auth login/status/logout`). Fixed a nasty AWS auth timeout bug that was hanging indefinitely. ### Undefined Tool (4 releases) Major **memory usage fixes** across the board - tackled rapid logging issues and reduced memory from encoding streaming chunks. Added **shell mode improvements** with raw text pasting and `/diff` now uses full screen in alt-screen mode. Quick help overlay (press `?`) is a nice UX touch. ### Gemini CLI (4 releases) Biggest feature drop: **`/prompt-suggest` slash command** for better prompting workflows. Mostly patch releases with cherry-picks, but the new command could be a game-changer for prompt engineering. ### OpenAI Codex CLI (3 releases) Added **experimental JavaScript REPL runtime** that persists state across tool calls - could be huge for interactive coding sessions. Memory files now include working directory context, fixing behavior when switching between projects. Multi-model support improvements too. ### Windsurf (1 release) Quiet week with just version 1.9552.21 - no feature details shared. ## Highlight Deep Dive 🎯 Gemini CLI's new **`/prompt-suggest` command** is the standout feature this week. While details are sparse, this could fundamentally change how developers craft prompts within their coding workflows. Instead of guessing at optimal prompts, the tool can now suggest improvements - potentially boosting AI code generation quality across the board. Combined with the hooks alignment for skills and other workflow impro