Claude Code v2.1.90 — /powerup interactive lessons, major performance fixes, and a bunch of QoL improvements Just dropped — here are the highlights:
New -
/powerup — interactive lessons that teach you Claude Code features with animated demos. Great for newcomers and for discovering features you didn’t know existed - .husky added to protected directories in acceptEdits mode
Performance (big ones) - SSE transport now handles large streamed frames in linear time (was
quadratic ) - Long conversations no longer slow down quadratically on transcript writes - Eliminated per-turn JSON.stringify of MCP tool schemas on cache-key lookup - /resume project view now loads sessions in parallel
Key Fixes - Fixed
–resume causing a full prompt-cache miss for users with deferred tools/MCP servers (regression since v2.1.69) - Fixed infinite loop where rate-limit dialog would repeatedly auto-open and crash the session - Fixed auto mode ignoring explicit user boundaries (“don’t push”, “wait for X before Y”) - Fixed Edit / Write failing when a PostToolUse format-on-save hook rewrites the file between edits - Hardened PowerShell tool permission checks (trailing & bypass, -ErrorAction Break debugger hang, TOCTOU, etc.)
Minor but nice - Fixed click-to-expand hover text invisible on light themes - Fixed headers disappearing when scrolling
/model , /config screens - –resume picker no longer shows -p /SDK sessions Full changelog: https://github.com/anthropics/claude-code/releases/tag/v2.1.90 I also run a YouTube channel where I make video breakdowns of every Claude Code release — if you prefer watching over reading changelogs: https://www.youtube.com/@claudelog submitted by /u/Select-Prune1056
Originally posted by u/Select-Prune1056 on r/ClaudeCode