Claude Code v1.0.39

# Claude Code v1.0.39 Changelog

• Added comprehensive activity tracking to monitor user and CLI operation timings
• New cp class tracks active operations and distinguishes between user activity and CLI activity
• Automatically records activity durations for analytics purposes
• 5-second timeout for user activity detection

• New checkpoint feature for saving and restoring project states within git repositories
• Automatically creates shadow git repositories in .claude/checkpoints/ for tracking changes
• Commands available (implementation details):
• Save checkpoints with custom labels
• Restore to previous checkpoints with automatic backup
• List all checkpoints in reverse chronological order
• Checkpoints are stored per git repository using SHA-256 hashing of the repository path

• Added functions to detect and manage interactive vs non-interactive sessions:
• d91() - Check if running in non-interactive mode
• yBA() - Check if running in interactive mode
• kBA() - Set interactive mode
• xBA() - Get client type
• vBA() - Set client type
• Client types supported: "cli", "github-action", "sdk-typescript", "sdk-cli"

• Enhanced model name display in Cj() function
• Now properly displays names for all Claude models:
• Opus 4
• Sonnet 4
• Sonnet 3.7
• Sonnet 3.5
• Haiku 3.5

• Added support for Android Studio in IDE detection
• JetBrains IDE list now includes "androidstudio"

• Improved command availability checking with new ih() function
• Uses proper executable path resolution before checking file permissions

• Updated to version 0.55.1 (internal version tracking)
• Main version updated to 1.0.39

• Added several internal utility modules for HTTP handling, base64 encoding, and query string building
• New imports for crypto functions (createHash, randomBytes)
• Added PassThrough stream support

• Refactored installer diagnostics (YT5 function) with simplified logic
• Removed several unused functions:
• ph - Command availability checker (replaced by ih)
• UA6 - IDE detection helper (replaced by R06)
• Qw0 - String splitting function
• z9A - Shell configuration finder
• wx2 - Version display formatter (replaced by $v2)
• uO5 - Permission description helper (replaced by dP5)

• Enhanced Kw0 class (formerly lz0) to support checkpoints
• Session logs now include checkpoint entries
• Added getAllCheckpoints() method to retrieve checkpoints for a session
• Modified log entry structure to handle checkpoint type

• Fixed duplicate import statements
• Improved error handling in checkpoint operations
• Better process detection on macOS (returns null immediately instead of attempting detection)

While the checkpoint system is integrated into the codebase, it would typically be used through CLI commands (exact command syntax would depend on the CLI implementation):

# Save a checkpoint with a custom label
claude checkpoint save "Before major refactoring"

# List all checkpoints
claude checkpoint list

# Restore to a previous checkpoint
claude checkpoint restore <checkpoint-id>

The activity tracking and interactive mode detection work automatically in the background to provide better analytics and adapt behavior based on the execution context.