Version 2.1.8

Create a fork of the current conversation at any point, branching off into a separate session while preserving the original context.

/fork              # Fork with auto-generated name
/fork my-branch    # Fork with custom name

• Creates a complete copy of the conversation up to the current point
• Automatically switches you to the new forked session
• Preserves all message history, attachments, and context
• Emits telemetry event tengu_conversation_forked
• Use /resume to switch between original and forked sessions

cK7 at line 489820 (name: "fork", description: "Create a fork of the current conversation at this point")

The "Claude in Chrome" browser extension now supports multiple Chromium-based browsers beyond just Google Chrome.

• Newly supported browsers: Brave, Microsoft Edge, Arc, Chromium, Vivaldi, Opera
• Auto-detects installed browsers and configures native messaging hosts for each
• Registers appropriate Windows registry keys for each browser
• Cross-platform support (macOS, Linux, Windows)

txA at line 295966 (browser config object with "brave", "arc", "edge", "chromium", "vivaldi", "opera" entries and NativeMessagingHosts paths)

Claude Code now automatically prevents macOS from sleeping during long-running operations.

Usage: Automatic—no user action required.

• Uses macOS caffeinate -i command to prevent idle sleep
• Active only during operations that need it (reference-counted)
• Automatically restarts caffeinate every 4 minutes to maintain prevention during very long tasks
• Properly cleans up on session exit
• Only applies to macOS; no effect on other platforms

OW9() at line 517291 (caffeinate, -i, -t, "Started caffeinate to prevent sleep")

In plan mode, you can now skip the AskUserQuestion interview and jump straight to planning.

• When answering plan mode questions, a new option appears: "Skip interview and plan immediately"
• Also adds "Chat about this" option for discussing questions with Claude
• Navigate between options using arrow keys
• Useful when you want Claude to proceed without answering all clarifying questions

kD9() at line 521459 ("Skip interview and plan immediately", "Chat about this")

A new permission scope for allowing Claude to edit its own configuration files within .claude/ directories.

• When Claude requests to edit files in .claude/, a new option appears: "Yes, and allow Claude to edit its own settings for this session"
• Grants session-scoped permission for the /.claude/** glob pattern
• Streamlines workflows where Claude needs to update its own configuration

GrA at line 96077 ("/.claude/**"), LN7() at line 517637 (scope: "claude-folder")

New internal infrastructure for tracking context compression events in long conversations.

• Adds microcompact_boundary system message type
• Tracks metadata about compaction: trigger, tokens saved, compacted tool IDs
• Used internally for session memory management
• No direct user interaction required

Uv2() at line 430955 (subtype: "microcompact_boundary", content: "Context microcompacted")

Adds platform-specific installation instructions when tmux is not found:

• macOS: brew install tmux
• Linux: sudo apt install tmux or sudo dnf install tmux
• Windows: Suggests WSL or Cygwin

ZI9() at line 513876 ("Install tmux with: brew install tmux")

When settings have validation errors but cleanupPeriodDays is explicitly set, cleanup is now skipped with a clear warning message rather than potentially misbehaving.

ww9() at line 540061 ("Skipping cleanup: settings have validation errors but cleanupPeriodDays was explicitly set")

MCP OAuth connections now attempt to auto-discover OAuth metadata from the server, improving compatibility with OAuth providers.

g92() at line 296348 ("Set OAuth metadata from server discovery")

Adds file download infrastructure for SDK/API sessions with retries and parallel download support.

HR7() at line 537150 (files-api-2025-04-14, "/v1/files/${A}/content")

• Fixed variable expansion detection to properly recognize both $VAR and %VAR% patterns (Xh() at line 501011)
• Internal telemetry function renames for consistency (multiple functions)

The ultrathink keyword no longer has any effect.

• Previous behavior: typing "ultrathink" in a message would enable extended thinking
• New behavior: Thinking budget is now max by default for all messages
• Users may see a tip: "Ultrathink no longer does anything. Thinking budget is now max by default."
• The regex pattern still exists but the parsing/detection logic has been removed

Tip at line 528403 ("ultrathink-deprecated", "Ultrathink no longer does anything. Thinking budget is now max by default.")