v2.1.21 Claude Code Release Notes

Jan 28, 2026

Claude's Analysisby Sonnet 4.6

VS Code gains Python venv auto-activation; six core fixes address session resumption after tool interrupts, premature auto-compact, and file search on Windows.

Changes

Total Changes (vs Average)

0.6×

Version Type

Patch

Release Focus

Bug Fixes

Day Since Prior Release

Release # This Month

#21 of 26

Bug Fix Ratio

60%

Post-Release Edits

—

Change Category

Ecosystem Impact

VS Code received changes in 4 of the last 10 releases—this time adding Python venv support and fixing Windows file search. Sustained editor-side investment suggests VS Code is tracking alongside core CLI development, not trailing it.

Key Themes

3Session & State Reliability|3VS Code Editor Integration|2Context Management & Tool Behavior|2Input & Progress UX Polish

May Help If You've Noticed

Python commands in VS Code use the system interpreter instead of your project's virtual environment

Added2 changes

•Added support for full-width (zenkaku) number input from Japanese IME in option selection prompts
•[VSCode] Added automatic Python virtual environment activation, ensuring python and pip commands use the correct interpreter (configurable via claudeCode.usePythonEnvironment setting)

Improved2 changes

•Improved read/search progress indicators to show "Reading…" while in progress and "Read" when complete
•Improved Claude to prefer file operation tools (Read, Edit, Write) over bash equivalents (cat, sed, awk)

Fixed6 changes

•Fixed shell completion cache files being truncated on exit
•Fixed API errors when resuming sessions that were interrupted during tool execution
•Fixed auto-compact triggering too early on models with large output token limits
•Fixed task IDs potentially being reused after deletion
•Fixed file search not working in VS Code extension on Windows
•[VSCode] Fixed message action buttons having incorrect background colors

Fixed6 changes

•Fixed shell completion cache files being truncated on exit

•Fixed API errors when resuming sessions that were interrupted during tool execution

•Fixed auto-compact triggering too early on models with large output token limits

•Fixed task IDs potentially being reused after deletion

•Fixed file search not working in VS Code extension on Windows

•[VSCode] Fixed message action buttons having incorrect background colors

v2.1.21 Claude Code Release Notes

Changes in Claude Code v2.1.21

Added2 changes

Improved2 changes

Fixed6 changes

v2.1.21 Claude Code Release Notes

Changes in Claude Code v2.1.21

Added2 changes

Improved2 changes

Fixed6 changes