[Release] anthropics/claude-code v2.1.221: v2.1.221

Claude Code v2.1.221 introduces a Focus view for cleaner chat interfaces, enhanced sandbox credential masking on Linux/WSL, improved permission checks and MCP server handling, and numerous bug fixes across VSCode, CLI, and desktop platforms. Key improvements include better cache efficiency for auto-mode decisions, refined plugin management, and enhanced session handling for background jobs. The release addresses security concerns, authentication issues, and user experience refinements across multiple platforms.

Key Points

• •Added Focus view toggle (Ctrl+Alt+F) to hide tool activity behind expandable per-turn summaries with live running-tool indicators
• •Implemented `mode: "mask"` for sandbox credential files on Linux/WSL using sentinel copies and regex extraction with real value substitution on egress
• •Fixed critical Bash tool permission-check bypass in zsh regex conditionals and PowerShell path handling with quote characters
• •Resolved MCP server connection issues in print mode and fixed @-mentioned files being dropped when retracting prompts
• •Improved auto-mode permission checks with cache-efficient parallel processing and reduced prompt-cache costs through conversation prefix reuse
• •Enhanced Stats panel to include cache token breakdown (input, output, cache read, cache write) in token totals
• •Fixed background sessions to commit/push work, open draft PRs only when needed, and follow CLAUDE.md git instructions
• •Improved plugin management: `/plugin install` now refreshes stale marketplace catalogs and plugins activate immediately when safe
• •Fixed session naming synchronization across Claude Code Desktop, claude.ai, and CLI with proper sanitization
• •Resolved authentication issues including Bedrock AWS SSO on Windows and rare wake-from-sleep race conditions with token refresh

Workflow Diagram

Concepts