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Claude Code 2.1.247 リリースノート要約

セキュリティ・安定性に関する修正

• プラグインマーケットプレイスの強化: 制御文字・不可視文字を含む名前を拒否し、マーケットプレイス提供テキストのエスケープ処理を追加
• hook や background agent が大量のエラー出力を行い、会話が溢れて「Prompt is too long」でセッションが固まる問題を修正
• Bash sandbox のクリーンアップが dotfile 管理された ~/.claude/settings.json のシンボリックリンク(nix/home-manager, stow)を誤って削除する問題を修正
• hook / background task の出力ファイルが書き込めない際の無制限なメモリ増加を修正

新機能

• SendFeedback tool を追加: 問題発生時に Claude がフィードバックドラフトを作成し、/feedback から送信可能(feedbackDrafts 設定で無効化可)
• /claude-api cost-optimize を追加: API 支出をプロファイリングし、キャッシュ・トークン効率・batch などのコスト削減策を一つずつ検証
• spinnerTipsOverride に {id, text, cooldownSessions, priority}、tipsFile、label を追加し、組織独自の tips 表示に対応
• Bash 権限プロンプトに auto mode への切り替え案内(ワンキー操作)を追加

その他の重要な変更

• Sonnet 5 の auto-compact ウィンドウを 1M コンテキスト全体に変更(約 967K token で compact)
• sub-agent が初回呼び出しで model 404 により死亡する問題を修正。セッションの fallback model chain を使用し、エラー詳細(種別・status・request id・model)を親に返すように
• Bedrock / Vertex / Foundry で MCP server 接続失敗時に Claude へ通知されない問題を修正
• /terminal-setup が Zed の keymap.json を丸ごと上書きする代わりにマージするよう修正
• クラウドセッションでコンテナ再起動時に無音化する問題を修正。再開時に失われた作業を報告
• セッション間 peer メッセージをデフォルトで 1 行プレビューに折りたたみ(Ctrl+O で展開)に変更

破壊的変更はなし。

原文（Release Notes）

What's changed

• Added the SendFeedback tool: when something goes wrong in a session, Claude can draft a feedback report for you to review and send from /feedback (turn off with the feedbackDrafts setting)
• Added {id, text, cooldownSessions, priority} entries, tipsFile, and label to spinnerTipsOverride, so organizations can rotate their own tips alongside the built-in ones
• Added a tip on Bash permission prompts pointing to auto mode, with a one-keystroke "Yes, and switch to auto mode" option
• Added /claude-api cost-optimize to profile an existing project's Claude API spend and work through cost levers (caching, token hygiene, batch, effort, model choice) one measured change at a time
• Updated the /claude-api skill with Admin API coverage (organization members, invites, workspaces, API keys, rate limit reports, workload identity federation, CMEK)
• Fixed fast arrow-key + Enter sequences acting on the row above the one you navigated to in history search, /config, /mcp, /skills, background tasks, and /model
• Fixed sub-agents dying on a first-call model 404: they now use the session's fallback model chain, and the error returned to the parent includes the error type, status, request id, and model
• Fixed a hook or background agent that printed megabytes of error output being able to overflow the conversation and wedge the session on "Prompt is too long"
• Fixed Ctrl keyboard shortcuts not firing under non-Latin (e.g. Cyrillic) keyboard layouts in kitty-protocol terminals
• Fixed text like <35;150;7M being inserted into the prompt when a mouse report arrived split across reads right after the escape prefix
• Fixed the Bash sandbox's after-command cleanup deleting a dotfile-managed ~/.claude/settings.json symlink (nix/home-manager, stow) when it is repointed outside the sandbox's writable area
• Fixed /terminal-setup overwriting your entire Zed keymap.json instead of merging in its keybinding
• Fixed /rename silently confirming when the session registry could not be updated; it now says other sessions may still show the old name
• Fixed /compact and "Summarize from here" in sessions started with --agent summarizing under the default system prompt instead of the conversation's own
• Fixed a background session showing "opening…" forever in claude agents after its terminal host process died; the row now fails within seconds with the reason, and Enter restarts it
• Fixed unbounded memory growth when a hook's or background task's output file could not be written; the file now notes where output was lost
• Fixed /install-github-app over SSH: the copy shortcut now says how the sign-in URL was copied instead of always claiming success, and the URL appears immediately when no browser can open
• Fixed shell commands carried over from the foreground logging an internal error or showing a misleading [exited with code -1] line when they finish in background sessions
• Fixed a version-less marketplace plugin's live cache directory being deleted and recreated on a second-scope install, which could disrupt a running session using it
• Fixed Remote Control sessions started with /remote-control not reporting the working-tree diff to connected clients
• Fixed self-hosted runner sessions reporting running before Claude Code had started, which could trigger a premature "Claude is waiting for your input" notification from the Claude desktop app
• Fixed first-run setup exiting with "Unable to connect to Anthropic services" when managed settings configure Claude apps gateway sign-in and Anthropic endpoints are unreachable
• Fixed cloud sessions (Claude Code on the web, desktop and mobile apps) sometimes showing the previous permission mode when you switch modes right after sending a message
• Fixed cloud sessions going silent when the session's container restarts between turns while a background agent, shell, or monitor is still running — the resumed session now reports the lost work
• Improved plugin marketplace hardening: names containing control or invisible characters are rejected, and marketplace-supplied text in /plugin and claude plugin output is escape-safe
• Improved Bedrock, Vertex, and Foundry sessions (and any with telemetry disabled): Claude is now told when a configured MCP server failed to connect, instead of concluding its tools don't exist
• Changed Sonnet 5's default auto-compact window to its full 1M context, so sessions on the 1M window now auto-compact at about 967K tokens instead of about 934K
• Changed cross-session peer messages to collapse by default to a one-line Message from @<sender>: <first line> preview; Ctrl+O expands the full body
• Changed terminal hyperlinks in rendered markdown: link targets that point at a network or automounter path, contain a control character, or lead with an invisible character now render as plain text
• Changed the prompt-footer PR badge to skip its GitHub re-check on terminal refocus when the last check is under a minute old
• Changed analytics to stay off from startup, not only after login, when managed settings force gateway login or a custom OAuth deployment is configured
• Changed Claude apps gateway sign-in requests to identify Claude Code (a surface=claude_code device-authorization parameter and a claude-code/<version> User-Agent)
• Changed organization sign-in enforcement to exit at start when the administrator's managed settings cannot be read, even if host-supplied or per-user Windows registry settings exist