# Claude Code v2.1.89 发布

- 来源：Claude Code：GitHub Releases（RSS）
- 作者：ashwin-ant
- 发布时间：2026-04-01 09:07
- AIHOT 链接：https://aihot.virxact.com/items/cmnw8fk5600auslcj94h33lja
- 原文链接：https://github.com/anthropics/claude-code/releases/tag/v2.1.89

## AI 摘要

Claude Code v2.1.89 发布，新增 defer 权限决策支持 headless 会话暂停恢复，引入 CLAUDE_CODE_NO_FLICKER 环境变量实现无闪烁渲染，新增 PermissionDenied hook 允许模型重试被拒命令。修复 Windows 平台 CRLF 处理、StructuredOutput 缓存失效、内存泄漏、LSP 僵尸进程、CJK 字符截断等 30 余项 bug。调整 Edit 工具行为，支持直接编辑通过 Bash 查看的文件；hook 输出超 5 万字符将转存磁盘；默认关闭 thinking summaries。优化 MCP 连接超时和子代理提及体验。

## 正文

What's changed

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

Auto mode: denied commands now show a notification and appear in /permissions → Recent tab where you can retry with r

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)

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+)

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