Claude Code 2.1.219 - リリースノート

日本語サマリー

本リリースに伴う破壊的変更や重大なセキュリティ修正はありません。主な変更点は以下の通りです。

• 新機能・追加

  • 新モデル Claude Opus 5 (claude-opus-5) がデフォルトのOpusモデルとして追加（1Mコンテキスト、fast mode対応）。
  • サンドボックスコマンドに対し、許可リスト外のホストをプロンプトなしで拒否する sandbox.network.strictAllowlist 設定を追加。
  • セッション途中の作業ディレクトリ追加時に発火する DirectoryAdded hook を追加。
  • サブエージェントのネスト生成上限がデフォルトで深さ3まで拡張（以前は1）。無効化するには CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH=1 を設定。
  • stream-json において、深さ2以上で生成されたネストされたサブエージェントの転送（--forward-subagent-text 使用時）を追加。

• 改善・仕様変更

  • fast mode の対象モデルを更新。Opus 5 と Opus 4.8 が対象となり、Opus 4.7 は除外。
  • 動的ワークフローのデフォルトサイズを「中（15エージェント未満を目標）」に変更（/config から変更可能）。
  • 環境変数 ${VAR} を用いたマネージドMCPの許可/拒否リストが、設定ファイルではなく起動時環境や managed-settings env から解決されるように変更。
  • claude mcp list や /mcp において、接続失敗時のHTTPステータスやエラー詳細の表示、および設定値の前後に隠れた空白文字がある場合の警告を追加。

• バグ修正

  • claude -p 実行中のAPIエラー発生時、それまでに生成済みの出力がドロップされる問題を修正。
  • Windows環境にて、CLAUDE_CODE_GIT_BASH_PATH のパスが不適切な場合に警告を出して無視するよう修正。
  • Self-hosted runner の再起動中に承認したパーミッションが失われる問題や、起動時の SIGTERM による古い状態が残り続ける問題を修正。
  • Vimモードの空プロンプトでの ← キー挙動、GNU screen 内での copy-on-select、およびスクリーンリーダーモードでの入力エコー時の挙動を修正。

原文（Release Notes）

What's changed

• Added Claude Opus 5 (claude-opus-5), now the default Opus model — 1M context, fast mode at $10/$50 per Mtok
• Added sandbox.network.strictAllowlist setting to deny non-allowlisted hosts for sandboxed commands without prompting
• Added DirectoryAdded hook that fires after /add-dir or the SDK register_repo_root control request registers a new working directory mid-session
• Added mcp_server_errors to the headless stream-json init event, listing --mcp-config entries skipped by config validation; terminal runs print a startup warning
• Added the workflowSizeGuideline settings key so the advisory Dynamic workflow size guideline can be set from any settings file; the /config row is hidden while one does
• Added nested subagent forwarding in stream-json: subagents spawned at depth-2+ now appear when --forward-subagent-text is set, keyed by their spawning Agent tool_use id
• Fixed claude -p text output dropping the answer already produced when a turn dies on a mid-stream API error
• Added HTTP status and error text to claude mcp list and /mcp when a server fails to connect, and a warning for MCP config values with hidden leading or trailing whitespace
• Fixed a permission you approved while a self-hosted runner was restarting being dropped when the session resumed, so the approved action now runs
• Fixed the Fable model row showing "Requires usage credits" for plans that include it, when a stale cache had baked the label in
• Fixed a SIGTERM arriving while a self-hosted runner was starting up leaving a stale active row until the lease expired; it now deregisters cleanly
• Added structured failure categories to self-hosted runner spawn and session failures, so hook errors, runner crashes and config errors can be told apart
• Fixed the /model picker showing the merged Opus row as plain "Opus" instead of "Opus (1M context)"
• Fixed copy-on-select inside GNU screen printing base64 into the terminal instead of copying the selection
• Fixed Remote Control clients keeping a stale fast-mode status after a model switch, reconnect, or failed org check
• Fixed CLAUDE_CODE_GIT_BASH_PATH on Windows exiting or being used as bash when the path isn't a bash/sh binary; it's now ignored with a warning
• Fixed Vim mode: pressing ← on an empty prompt now returns to the agent view from NORMAL mode, not just INSERT
• Fixed screen-reader mode rewriting the entire input line on every keystroke instead of echoing only the typed character
• Improved the "Remote Control is only available via api.anthropic.com" error to name the specific setting that caused it
• Improved claude --teleport to show which repo your current checkout points at when it doesn't match the session's repo
• Changed dynamic workflows to default to a medium size guideline (aim for fewer than 15 agents); pick another size or unrestricted with Dynamic workflow size in /config
• Changed managed MCP allowlist/denylist ${VAR} entries to resolve from the startup environment and managed-settings env instead of settings-file env
• Changed the /model picker to highlight only the newest model's name, so the highlight marks the new release rather than an arbitrary subset of the list
• Added the current default workflow size to the running-workflow status line, with a pointer to /config for changing it
• Removed Opus 4.7 from fast mode; /fast now applies to Opus 5 and Opus 4.8
• Updated the claude-api skill to default to Claude Opus 5, with a migration path from Opus 4.8
• Subagents can now spawn nested subagents up to depth 3 by default (was 1); set CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH=1 to disable nesting