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Claude Code 2.1.267 リリースノート要約

セキュリティ修正

• marketplaceエントリのパスにバックスラッシュが含まれる場合、macOS/Linuxでのコンテインメントチェックをバイパスし得る問題を修正
• 管理設定の allowedHttpHookUrls、httpHookAllowedEnvVars、allowedChannelPlugins が読み取り不能な場合、全許可ではなく全拒否になるよう修正

新機能

• maxEffortLevel 設定を追加（トップレベルまたは modelSettings 配下）。Bedrock / Vertex / Foundry を含む全プロバイダの effort レベル上限を設定可能
• --system-prompt-snapshot off フラグを追加。会話の記録済みプロンプトを再利用せず、毎回システムプロンプトを新規生成（プロンプトテキストの反復調整用）

主な修正

• Workflow の agent() で大きな output schema を持つ呼び出しが auto モードで拒否される問題を修正（safety classifier によるチェックが正しく走るように）
• -p --resume 後に偽の "Continue from where you left off." ターンが挿入される問題を修正
• 5MB超の大きなセッション再開時に、並列ツール呼び出しとフック出力が失われる問題を修正
• カスタムコマンド・スキル・サブエージェントの effort: フロントマターが、デフォルト effort が固定されたモデル（Opus 4.7 / 4.8、Fable 5）で無視される問題を修正
• claude remote-control のサーバー資格情報有効期限（開始約30日後）切れで全セッションが切断される問題を修正。ホストは再登録して継続するように

パフォーマンス・安定性（prompt-cache 関連を中心に多数）

• /model によるモデル切替時に全ツール定義を再送しないように修正
• MCP サーバの再接続・ツール変更・セッション再開時の prompt-cache ミスや extended thinking の消失を多数修正
• -p の会話を対話的に再開した際の system prompt プレフィックス変化による cache ブレークを修正
• モバイルクライアントで /context などのローカルコマンド出力が空白になる問題を修正

その他の改善

• Bash ツールの説明ガイダンス改善（コマンドをそのままエコーせず平文で説明）
• サンドボックス内で pbcopy 等が失敗した際、/copy を提案するように
• --resume の初回描画時間を Bash ツール呼び出しが多いセッションで改善

VSCode 拡張

• 拡張ホストが100% CPUでハングする問題（cyclic parent link を含むトランスクリプト）を修正
• WSL2/WSLg でのスクリーンショット貼り付け、CRLF ファイルの編集適用、パスにスペースを含むファイルの @-mention などの問題を修正

Claude Code on the web / Claude Tag

• GitHub Enterprise Server のトークン期限切れ後のアカウント切断表示を修正（自動リフレッシュ）
• Claude Tag で利用クレジット切れ時に誤った API エラーではなく適切なメッセージを表示するよう修正

原文（Release Notes）

What's changed

• Added maxEffortLevel setting (top-level or per model under modelSettings): caps the effort level on every provider, including Bedrock, Vertex and Foundry; users can still pick a lower level
• Added --system-prompt-snapshot off to render the system prompt fresh on every request instead of reusing the conversation's recorded prompt (for iterating on prompt text)
• Fixed Cowork scheduled tasks in the cloud failing at startup for organizations whose managed settings require sandboxing
• Fixed /context and other local command output rendering blank on mobile clients
• Fixed shift+enter and option+backspace not working after reconnecting to a tmux or ssh session inside an agent view
• Fixed the dim last-prompt header not appearing at the top of the conversation when scrolling up in fullscreen mode
• Fixed Workflow agent() calls with large output schemas being refused in auto mode instead of being checked by the safety classifier
• Fixed a case where a marketplace entry path containing a backslash could bypass the containment check for fetched marketplaces on macOS and Linux
• Fixed expired AWS or Google Cloud credentials under a host app such as Claude Desktop retrying ten times with a generic "request failed" before the re-authenticate error appeared
• Fixed resuming a session after /compact or another slash command ran via -p --resume: a spurious "Continue from where you left off." turn is no longer inserted
• Fixed resuming a large session (transcript over 5 MB): parallel tool calls and their hook output are no longer dropped from the reloaded conversation
• Fixed managed allowedHttpHookUrls, httpHookAllowedEnvVars and allowedChannelPlugins to admit nothing, not everything, when unreadable
• Fixed /login on machines whose managed settings require Claude apps gateway sign-in: Esc now closes the dialog instead of doing nothing
• Fixed artifact publishes cut off by a dropped connection mid-upload: they now retry once when Claude Code can tell the upload never completed, instead of reporting an unknown outcome
• Fixed effort: frontmatter on custom commands, skills, and subagents being ignored on models whose default effort is still pinned (Opus 4.7, Opus 4.8, Fable 5)
• Fixed artifact publish failing with an unhelpful error when the page file isn't valid UTF-8 or contains a replacement character (U+FFFD); the error now names the line and column to fix
• Fixed claude agents @ directory menu not listing repositories created after the session started
• Fixed Remote Control clients that join a Claude Desktop or VS Code session showing a stale permission mode until it was changed again
• Fixed claude remote-control exiting and dropping every attached session when its server credential expires (about 30 days after start); the host now re-registers and keeps going
• Fixed the usage-limit warning flickering on and off during a session when requests for different models or modes report different limit windows
• Fixed earlier reasoning being dropped when an MCP server re-sends, or a built-in tool re-renders, a tool the model already loaded
• Fixed a tool that disappears mid-conversation, from a disconnected MCP server or an upgrade, rewriting the tool list and discarding earlier thinking
• Fixed a background worker forked from a conversation adding EnterWorktree to the conversation's tool block mid-session, which broke prompt-cache reuse
• Fixed mid-session MCP and plugin tools being added to the tool list in sessions without ToolSearch, which broke prompt-cache reuse; supported models now receive them as deferred definitions
• Fixed switching models with /model re-sending every tool definition (a prompt-cache miss); commit and PR attribution text now arrives as a conversation note that updates on model changes
• Fixed resumed sessions rewriting the inline tool set when an MCP connector reconnects at a different moment than before
• Fixed resumed sessions re-rendering tool descriptions instead of replaying the recorded ones when the first turn ran a tool
• Fixed prompt-cache misses and dropped extended thinking when a claude.ai connector's tools change between a session and its resume
• Fixed resumed sessions rewriting earlier MCP tool announcements (and dropping extended thinking) before their connectors reconnect
• Fixed a prompt-cache break when a print-mode (-p) conversation is resumed interactively: the system prompt prefix no longer changes
• Improved the /diff panel: it no longer flashes "0 files changed" and a spinner before settling, and its empty state is centered in the panel
• Improved the Bash tool's description guidance so Claude describes what a command does in plain words instead of echoing the command
• Improved sandbox guidance so Claude suggests /copy when clipboard commands such as pbcopy fail inside the sandbox
• Improved --resume first-render time for sessions with many Bash tool calls
• Improved prompt input responsiveness: keystrokes no longer occasionally wait a frame behind spinner or streaming repaints
• Improved prompt-cache stability: subagents and sessions started with --system-prompt or --append-system-prompt now record the system prompt and tool definitions once instead of re-rendering them
• Improved Artifact tool publish errors: when a publish is refused, the message now says why and what to do about it
• Self-hosted runner: Changed --use-anthropic-git-proxy to be reported to the server at registration and to print a warning for each session that still clones through the legacy git proxy
• Gateway: Changed forward_user_identity upstreams to return a 429 as-is to a developer whose email was forwarded, instead of failing over to the next upstream, so the proxy's per-user limits hold
• [VSCode] Fixed the extension host hanging at 100% CPU when forking, editing an earlier message, or rewinding in a conversation whose saved transcript contains a cyclic parent link
• [VSCode] Fixed pasting a screenshot on WSL2/WSLg inserting raw image bytes into the chat input; the image is now attached when the clipboard provides it, otherwise the paste is ignored
• [VSCode] Fixed chat diff blocks always rendering with a dark editor theme; they now follow the active VS Code color theme, including high contrast
• [VSCode] Fixed mixed right-to-left and English text rendering in the wrong order while typing in the message input
• [VSCode] Fixed accepting an edit in the diff view on a file with Windows (CRLF) line endings failing with "String not found in file"
• [VSCode] Fixed @-mentions dropping files whose paths contain spaces
• [VSCode] Fixed the sessions list view failing to load in windows connected over Remote-SSH when the workspace folder exists only on the remote host
• [VSCode] Fixed runaway ripgrep processes when viewing files in large or symlink-heavy workspaces
• [Claude Code on the web] Fixed GitHub Enterprise Server sessions showing your GitHub account as disconnected once its token expired; PR and issue operations now refresh it automatically
• [Claude Code on the web] Fixed gh and GitHub API calls failing in organizations without the Claude GitHub App; they now use your connected GitHub account and say so when none is connected
• [Claude Tag] Added a "Use a custom connector" link to the preset connection forms in Claude Tag admin settings, so you can switch to a custom connection without starting over
• [Claude Tag] Fixed Claude replying "The API rejected the request as invalid" when the organization has run out of usage credits; the reply now says so and explains how to add more
• [Claude Tag] Fixed thread requests to edit or delete a message Claude posted at the channel's top level being answered with a correction instead of reaching the session that posted it
• [Claude Tag] Fixed Connect on Tool access requests under Admin settings > Review requests failing with "Authorization failed" or showing the requested access bundle as deleted