[Release] anthropics/claude-code v2.1.63: v2.1.63

Claude Code v2.1.63 release includes new slash commands (/simplify, /batch), HTTP hooks support, and numerous bug fixes and memory leak resolutions. Key improvements address MCP server handling, git worktree configuration sharing, message ordering in REPL bridge, and long-running session stability.

Key Points

• •Added `/simplify` and `/batch` bundled slash commands for enhanced workflow automation
• •Fixed multiple memory leaks in long-running sessions including git root detection, JSON parsing cache, and MCP server fetch caches to improve stability
• •Implemented HTTP hooks feature allowing POST/JSON requests to URLs as alternative to shell commands
• •Fixed local slash command output (e.g., `/cost`) incorrectly appearing as user messages instead of system messages in UI
• •Project configs and auto memory now shared across git worktrees of the same repository for better multi-worktree support
• •Added `ENABLE_CLAUDEAI_MCP_SERVERS=false` environment variable to opt out of claude.ai MCP server availability
• •Improved `/model` command to display currently active model in slash command menu for better visibility
• •Added manual URL paste fallback for MCP OAuth authentication when automatic localhost redirect fails
• •Fixed race condition in REPL bridge causing message ordering issues during initial connection flush
• •Enhanced memory usage in long sessions by stripping heavy progress message payloads during context compaction and added session rename/remove actions in VSCode

Workflow Diagram

Concepts