This release delivers significant usability and stability improvements. Key new features include flicker-free terminal rendering, enhanced auto-mode denial management with retry capabilities, and faster MCP tool connections, alongside deferred tool use in headless sessions. The Edit tool now seamlessly works on files viewed with Bash commands like `sed -n`, removing the need for prior `Read` calls. Furthermore, numerous critical fixes address issues ranging from correct symlink resolution and CRLF handling, to memory leaks, LSP server restarts, and reliable `resume` functionality, ensuring a more robust and efficient experience.
Added5
- Added `"defer"` permission decision to `PreToolUse` hooks — headless sessions can pause at a tool call and resume with `-p --resume` to have the hook re-evaluate
- Added `CLAUDE_CODE_NO_FLICKER=1` environment variable to opt into flicker-free alt-screen rendering with virtualized scrollback
- Added `PermissionDenied` hook that fires after auto mode classifier denials — return `{retry: true}` to tell the model it can retry
- Added named subagents to `@` mention typeahead suggestions
- Added `MCP_CONNECTION_NONBLOCKING=true` for `-p` mode to skip the MCP connection wait entirely, and bounded `--mcp-config` server connections at 5s instead of blocking on the slowest server
Improved4
- Improved collapsed tool summary to show "Listed N directories" for `ls`/`tree`/`du` instead of "Read N files"
- Improved Bash tool to warn when a formatter/linter command modifies files you have previously read, preventing stale-edit errors
- Improved `@`-mention typeahead to rank source files above MCP resources with similar names
- Improved PowerShell tool prompt with version-appropriate syntax guidance (5.1 vs 7+)
Changed13
- Auto mode: denied commands now show a notification and appear in `/permissions` → Recent tab where you can retry with `r`
- Changed `Edit` to work on files viewed via `Bash` with `sed -n` or `cat`, without requiring a separate `Read` call first
- Changed hook output over 50K characters to be saved to disk with a file path + preview instead of being injected directly into context
- Changed `cleanupPeriodDays: 0` in settings.json to be rejected with a validation error — it previously silently disabled transcript persistence
- Changed thinking summaries to no longer be generated by default in interactive sessions — set `showThinkingSummaries: true` in settings.json to restore
- Documented `TaskCreated` hook event and its blocking behavior
- Preserved task notifications when backgrounding a running command with Ctrl+B
- PowerShell tool on Windows: external-command arguments containing both a double-quote and whitespace now prompt instead of auto-allowing (PS 5.1 argument-splitting hardening)
- `/env` now applies to PowerShell tool commands (previously only affected Bash)
- `/usage` now hides redundant "Current week (Sonnet only)" bar for Pro and Enterprise plans
- Image paste no longer inserts a trailing space
- Pasting `!command` into an empty prompt now enters bash mode, matching typed `!` behavior
- `/buddy` is here for April 1st — hatch a small creature that watches you code
Fixed30
- Fixed `Edit(//path/**)` and `Read(//path/**)` allow rules to check the resolved symlink target, not just the requested path
- Fixed voice push-to-talk not activating for some modifier-combo bindings, and voice mode on Windows failing with "WebSocket upgrade rejected with HTTP 101"
- Fixed Edit/Write tools doubling CRLF on Windows and stripping Markdown hard line breaks (two trailing spaces)
- Fixed `StructuredOutput` schema cache bug causing ~50% failure rate when using multiple schemas
- Fixed memory leak where large JSON inputs were retained as LRU cache keys in long-running sessions
- Fixed a crash when removing a message from very large session files (over 50MB)
- Fixed LSP server zombie state after crash — server now restarts on next request instead of failing until session restart
- Fixed prompt history entries containing CJK or emoji being silently dropped when they fall on a 4KB boundary in `~/.claude/history.jsonl`
- Fixed `/stats` undercounting tokens by excluding subagent usage, and losing historical data beyond 30 days when the stats cache format changes
- Fixed `-p --resume` hangs when the deferred tool input exceeds 64KB or no deferred marker exists, and `-p --continue` not resuming deferred tools
- Fixed `claude-cli://` deep links not opening on macOS
- Fixed MCP tool errors truncating to only the first content block when the server returns multi-element error content
- Fixed skill reminders and other system context being dropped when sending messages with images via the SDK
- Fixed PreToolUse/PostToolUse hooks to receive `file_path` as an absolute path for Write/Edit/Read tools, matching the documented behavior
- Fixed autocompact thrash loop — now detects when context refills to the limit immediately after compacting three times in a row and stops with an actionable error instead of burning API calls
- Fixed prompt cache misses in long sessions caused by tool schema bytes changing mid-session
- Fixed nested CLAUDE.md files being re-injected dozens of times in long sessions that read many files
- Fixed `--resume` crash when transcript contains a tool result from an older CLI version or interrupted write
- Fixed misleading "Rate limit reached" message when the API returned an entitlement error — now shows the actual error with actionable hints
- Fixed hooks `if` condition filtering not matching compound commands (`ls && git push`) or commands with env-var prefixes (`FOO=bar git push`)
- Fixed collapsed search/read group badges duplicating in terminal scrollback during heavy parallel tool use
- Fixed notification `invalidates` not clearing the currently-displayed notification immediately
- Fixed prompt briefly disappearing after submit when background messages arrived during processing
- Fixed Devanagari and other combining-mark text being truncated in assistant output
- Fixed rendering artifacts on main-screen terminals after layout shifts
- Fixed voice mode failing to request microphone permission on macOS Apple Silicon
- Fixed Shift+Enter submitting instead of inserting a newline on Windows Terminal Preview 1.25
- Fixed periodic UI jitter during streaming in iTerm2 when running inside tmux
- Fixed PowerShell tool incorrectly reporting failures when commands like `git push` wrote progress to stderr on Windows PowerShell 5.1
- Fixed a potential out-of-memory crash when the Edit tool was used on very large files (>1 GiB)
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