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Claude Code 2.1.203 リリースノート要約

⚠️ セキュリティ修正および破壊的変更

• [セキュリティ修正] background および agent-view sessions にて、shell-exported な ANTHROPIC_BASE_URL が破棄され API keys が誤ってデフォルトエンドポイントに送信され 401 エラーが発生する問題を修正しました。
• [破壊的変更] background tasks, diff, workflow detail views を閉じる操作が左矢印キーから Esc キーに変更されました。

その他の重要な変更点

• パフォーマンス改善: interactive sessions でのメモリおよび CPU 使用量の増大を修正しました。また、バンドルされる依存関係の遅延ロードにより、バイナリサイズと起動時メモリをそれぞれ約 7 MB 削減しました。
• MacOS不具合修正: 誤ったメモリ不足検知により、background agent sessions の起動・切替が 15〜20秒間フリーズする問題（2.1.196のリグレッション）を修正しました。
• Worktree・Agentの安定性向上: git worktree が多数あるリポジトリでのエラーや、サブエージェントが親ディレクトリでコマンドを実行してしまう問題、不要な別サブエージェントへの丸投げ動作などを修正しました。
• Daemonの安定性修正: daemon の session token が古くなった際の応答停止や、auto-upgrade 失敗による実行中セッションの強制終了、Windows 環境で古い PATH を継承してしまう問題などを修正しました。
• UI/UXの改善: ログイン有効期限切れの警告を追加し、manual permission mode であることを示す ⏸ バッジをフッターに表示するようになりました。
• MCP 連携強化: セッションの追加作業ディレクトリを MCP roots/list に追加し、変更時に notifications/roots/list_changed を送信するようになりました。
• 設定の不具合修正: effortLevel 変更の無視や、CLAUDE_CODE_DISABLE_MOUSE 等のオプトアウト設定が無視される問題を修正しました。
• ターミナル操作性の向上: 長いレスポンスのストリーミング中の応答性を向上させ、スクロール時の画面ジャンプや bash mode 入力時のフリッカーを修正しました。
• VSCode: すべてのセッションで "Enable Remote Control" を有効にする設定トグルを追加しました。

原文（Release Notes）

What's changed

• Added a warning when your login is about to expire, so you can re-authenticate before background sessions are interrupted
• Added a grey ⏸ badge to the footer when in manual permission mode, making the active mode always visible
• Added the session's additional working directories to MCP roots/list, with notifications/roots/list_changed sent when the set changes
• Fixed opening or switching background agent sessions on macOS stalling for 15–20 seconds due to a false low-memory detection (regression in 2.1.196)
• Fixed background sessions becoming permanently unresponsive to attach, replies, and stop when the daemon's session token went stale — the session now recovers automatically
• Fixed returning to claude agents silently stopping running subagents and re-running the prompt from scratch — their work now carries over
• Fixed a memory and per-turn CPU regression in interactive sessions: the context-usage indicator no longer re-analyzes the entire transcript after every turn
• Fixed background agents inheriting a stale PATH from the daemon instead of the dispatching shell, causing missing tools on Windows
• Fixed background and agent-view sessions dropping a shell-exported ANTHROPIC_BASE_URL, which sent API keys to the default endpoint and failed with 401
• Fixed Bash failing with "argument list too long" in repos with many git worktrees
• Fixed worktree-isolated subagents sometimes running shell commands in the parent checkout instead of their own worktree
• Fixed worktree creation rejecting nested repositories in multi-repo workspaces, leaving background sessions unable to isolate and edit
• Fixed background agents crash-looping when their working directory was deleted, replaced by a file, or became an invalid path — they now fail once with a clear error
• Fixed a background daemon auto-upgrade failure silently killing all running background sessions
• Fixed TaskStop and TaskOutput failing to find background agents spawned by another agent — errors now list running agents by id and description
• Fixed the claude agents composer discarding your typed message when a slash command isn't available there
• Fixed the agent list crashing when opening a stopped session whose conversation was already open in another session
• Fixed background sessions showing "Needs input" in the agent list after the question was already answered
• Fixed background agent startup failures showing only "exit_with_message" instead of the actual error
• Fixed background sessions ignoring effortLevel changes in settings.json when forked through the daemon
• Fixed attached background sessions ignoring CLAUDE_CODE_DISABLE_MOUSE and CLAUDE_CODE_DISABLE_MOUSE_CLICKS opt-outs
• Fixed /exit incorrectly warning about running background agents after all named agents had completed
• Fixed background sessions started from a non-git directory unable to edit files when a WorktreeCreate hook was configured
• Fixed the @ directory picker in claude agents not showing registered git worktrees
• Fixed background task output on Windows being permanently replaced by an empty file after /clear
• Fixed content jumping when scrolling up through long transcript history
• Fixed the terminal flickering and jumping while typing in bash mode when a shell-history suggestion was shown
• Fixed literal ^[[I / ^[[O escape codes being printed when reattaching to a background session
• Fixed LSP-only plugins being incorrectly flagged for disuse when their language servers deliver diagnostics or answer navigation requests
• Improved responsiveness while long responses stream: live-preview updates no longer re-render the whole screen
• Improved subagent behavior: agents are now less likely to re-delegate their entire task to another subagent
• Reduced binary size by ~7 MB and startup memory by ~7 MB by loading a large bundled dependency lazily instead of inlining it
• Changed left arrow to no longer close the background tasks, diff, and workflow detail views — press Esc instead
• Changed the empty claude agents view to always show the organized sections (Needs input / Working / Completed) with descriptions
• Removed the startup "claude command missing or broken" warnings — they now appear in /doctor and /status instead
• Removed a redundant navigation hint from the claude agents footer
• [VSCode] Added a Settings toggle for "Enable Remote Control for all sessions"