# Claude Code v2.1.50 > Claude Code v2.1.50, released 20 Feb 2026 (2026-02-20). 14 entries read out of the shipped bundle. Unofficial, and not affiliated with Anthropic. Web version: https://changelogs.core-directive.com/v/2.1.50 This release introduces the new `/diff` command for viewing uncommitted changes and per-turn diffs, adds VCS-agnostic worktree isolation through configurable hooks (`WorktreeCreate`/`WorktreeRemove`), and includes improved handling for MCP servers that are still connecting. Several internal improvements enhance system sleep detection for WebSocket connections and add better logging for sandbox symlink handling on Linux. ## Changes ### `/diff` Command **What** A new slash command to view uncommitted changes and per-turn file diffs directly in the CLI. **Usage** `/diff` **Details** - Opens a dialog showing uncommitted changes in your repository - Displays per-turn diffs showing what changed during each interaction - Provides a clear visual summary of file modifications **Evidence** Diff dialog slash command (search for `"View uncommitted changes and per-turn diffs"`) ### VCS-Agnostic Worktree Isolation via Hooks **What** Custom hooks for creating and removing worktrees, enabling worktree isolation to work with any version control system—not just Git. **Usage** Configure hooks in your `settings.json`: `{ "hooks": { "WorktreeCreate": [{ "command": "your-worktree-create-script" }], "WorktreeRemove": [{ "command": "your-worktree-remove-script" }] } }` **Details** - `WorktreeCreate` hook receives JSON input with `name` (suggested worktree slug); stdout should contain the absolute path to the created worktree - `WorktreeRemove` hook receives JSON input with `worktree_path` (absolute path to worktree); exit code 0 indicates successful removal - Enables worktree isolation for non-Git VCS systems (Mercurial, SVN, etc.) - Error messages guide users when hooks are missing or fail **Evidence** Hook types and error messages (search for `"WorktreeCreate"`, `"WorktreeRemove"`, `"Configure WorktreeCreate/WorktreeRemove hooks"`) ### `/agents` Command for Listing Configured Agents **What** A new command to list all configured agents with their sources and status. **Usage** `/agents` **Details** - Shows agents grouped by source (User, Project, Local, Managed, Plugin, CLI arg, Built-in) - Displays which agents are shadowed/overridden by higher-priority sources - Shows model and memory settings for each agent **Evidence** Agent listing function (search for `"List configured agents"`, `"No agents found."`, `"shadowed by"`) ### Agent Worktree Isolation Option **What** Agents can now specify an `isolation` field to run in an isolated worktree. **Usage** Agents can be configured with `isolation: "worktree"` to run in a temporary git worktree or hook-based worktree for isolated work. **Details** - Creates an isolated copy of the repository for the agent to work on - Supports both Git worktrees and custom hook-based worktrees - Useful for agents that need to make changes without affecting the main working directory **Evidence** Isolation parsing in agent frontmatter (search for `"isolation"`, `"Isolation mode"`) ### Pending MCP Server Notification in ToolSearch **What** When searching for deferred tools, if some MCP servers are still connecting, the tool now reports which servers are pending. **Details** - Results include `pending_mcp_servers` field when servers are still initializing - Message indicates servers are connecting and tools will become available shortly **Evidence** Pending server handling (search for `"Some MCP servers are still connecting"`, `"pending_mcp_servers"`) ### System Sleep Detection for WebSocket Connections **What** Improved reconnection handling when the system wakes from sleep. **Details** - Detects large time gaps between reconnection attempts indicating system sleep - Resets the reconnection budget after sleep to avoid exhausting retries - Adds periodic keep-alive frames for more reliable connection maintenance **Evidence** Sleep detection logic (search for `"Detected system sleep"`, `"resetting reconnection budget"`) ### Improved Bash Command Prefix Suggestions **What** More intelligent command prefix extraction for permission rules, with support for suggesting editable prefixes. **Details** - Uses @withfig/autocomplete specs for better understanding of command structure - Supports `pyright`, `timeout`, `sleep`, `alias`, `nohup`, `time`, and `srun` commands with proper argument parsing - Permission prompts can show "Yes, and don't ask again for" with editable command prefix **Evidence** Fig autocomplete integration (search for `"@withfig/autocomplete"`, `"command prefix (e.g., npm run:*)"`) ### Enhanced Memory Prompts **What** Clearer organization of memory guidance with separate sections for explicit user requests. **Details** - Added "Explicit user requests" section for remember/forget instructions - More concise guidance on when to save memories - Removed redundant "when in doubt" guidance **Evidence** Memory prompt changes (search for `"## Explicit user requests:"`) ### Linux Sandbox Symlink Safety **What** Better handling of symlinked write paths in the Linux sandbox. **Details** - Skips symlink write paths that point outside expected locations - Logs warnings when write paths cannot be resolved - Prevents potential sandbox escapes via symlink manipulation **Evidence** Sandbox symlink handling (search for `"Skipping symlink write path pointing outside expected location"`) ### macOS Sandbox Unix Socket Permissions **What** More granular Unix socket permissions in the macOS sandbox. **Details** - Changed from broad `network*` permission to specific `network-bind` and `network-outbound` for Unix sockets - Adds `AF_UNIX` socket domain permission explicitly - Improves security by limiting socket access to specific paths **Evidence** Sandbox socket rules (search for `"(allow system-socket (socket-domain AF_UNIX))"`) ### Improved Session Resume Telemetry **What** Better tracking of session resume performance and success/failure. **Details** - Tracks resume duration in milliseconds - Reports success/failure status for session resume operations - Helps identify performance issues with session loading **Evidence** Resume telemetry (search for `"tengu_session_resumed"`, `"resume_duration_ms"`) ### CLAUDE_CODE_SIMPLE Mode Improvements **What** Enhanced behavior for CLAUDE_CODE_SIMPLE environment variable. **Details** - Disables attachments when CLAUDE_CODE_SIMPLE is set - Skips memory file loading for simplified operation - Adds CWD and Date to system prompt in simple mode **Evidence** Simple mode checks (search for `"CLAUDE_CODE_SIMPLE"`) ## Bug Fixes - Fixed issue where GitHub issue/PR references with fewer than 3 digits (e.g., `#12`) were incorrectly linkified; now only references with 3+ digits are processed (search for `/(?