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Written by AI from the official notes. Check them for exact details.Claude Code 2.1.21 introduces new features for Japanese input and several bug fixes.
- Added support for full-width number input from Japanese IME.
- Improved automatic Python virtual environment activation in VSCode.
- Fixed API errors when resuming interrupted sessions.
- Fixed shell completion cache files truncation on exit.
- Improved read/search progress indicators.
Why it matters: Developers using Claude Code, especially in VSCode, will benefit from enhanced functionality and bug fixes.
Full release notes10 changes
What's changed
- Added support for full-width (zenkaku) number input from Japanese IME in option selection prompts
- 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
- 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)
- [VSCode] Added automatic Python virtual environment activation, ensuring
pythonandpipcommands use the correct interpreter (configurable viaclaudeCode.usePythonEnvironmentsetting) - [VSCode] Fixed message action buttons having incorrect background colors