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Claude Code Updates & Release Notes

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Claude Code von Anthropic

Claude Code 2.1.70: Fehlerbehebungen für Gateways, Voice und Windows

Version 2.1.70 behebt unter anderem API-400-Fehler mit Drittanbieter-Gateways und Bedrock-Profilen, leere Antworten nach ToolSearch, Clipboard-Probleme mit Nicht-ASCII-Text unter Windows/WSL sowie Fehler im Voice-Modus.

  • Fixed API 400 errors when using ANTHROPIC_BASE_URL with a third-party gateway — tool search now correctly detects proxy endpoints and disables tool_reference blocks
  • Fixed API Error: 400 This model does not support the effort parameter when using custom Bedrock inference profiles or other model identifiers not matching standard Claude naming patterns
  • Fixed empty model responses immediately after ToolSearch — the server renders tool schemas with system-prompt-style tags at the prompt tail, which could confuse models into stopping early
  • Fixed prompt-cache bust when an MCP server with instructions connects after the first turn
  • Fixed Enter inserting a newline instead of submitting when typing over a slow SSH connection
  • Fixed clipboard corrupting non-ASCII text (CJK, emoji) on Windows/WSL by using PowerShell Set-Clipboard
  • Fixed extra VS Code windows opening at startup on Windows when running from the VS Code integrated terminal
  • Fixed voice mode failing on Windows native binary with "native audio module could not be loaded"
  • Fixed push-to-talk not activating on session start when voiceEnabled: true was set in settings
  • Fixed markdown links containing #NNN references incorrectly pointing to the current repository instead of the linked URL
  • Fixed repeated "Model updated to Opus 4.6" notification when a project's .claude/settings.json has a legacy Opus model string pinned
  • Fixed plugins showing as inaccurately installed in /plugin …

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Claude Code von Anthropic

Claude Code 2.1.69: /claude-api-Skill, /reload-plugins und mehr Sprachen

Version 2.1.69 ergänzt den /claude-api-Skill, /reload-plugins, einen Namensparameter für /remote-control, Voice-STT für 10 weitere Sprachen, eine Effort-Anzeige sowie neue Einstellungen wie includeGitInstructions und sandbox.enableWeakerNetworkIsolation.

  • Added the /claude-api skill for building applications with the Claude API and Anthropic SDK
  • Added Ctrl+U on an empty bash prompt (!) to exit bash mode, matching escape and backspace
  • Added numeric keypad support for selecting options in Claude's interview questions (previously only the number row above QWERTY worked)
  • Added optional name argument to /remote-control and claude remote-control (/remote-control My Project or --name "My Project") to set a custom session title visible in claude.ai/code
  • Added Voice STT support for 10 new languages (20 total) — Russian, Polish, Turkish, Dutch, Ukrainian, Greek, Czech, Danish, Swedish, Norwegian
  • Added effort level display (e.g., "with low effort") to the logo and spinner, making it easier to see which effort setting is active
  • Added agent name display in terminal title when using claude --agent
  • Added sandbox.enableWeakerNetworkIsolation setting (macOS only) to allow Go programs like gh, gcloud, and terraform to verify TLS certificates when using a custom MITM proxy with httpProxyPort
  • Added includeGitInstructions setting (and CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS env var) to remove built-in commit and PR workflow instructions from Claude's system prompt
  • Added /reload-plugins command to activate pending plugin changes without restarting
  • Added a one-time startup prompt suggesting Claude Code Desktop on macOS and Windows (max 3 showings, dismissible) …

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Claude Code von Anthropic

Claude Code 2.1.68: Opus 4.6 standardmäßig mit mittlerem Effort

Version 2.1.68 setzt Opus 4.6 für Max- und Team-Abos standardmäßig auf mittleren Effort, führt das Schlüsselwort "ultrathink" für hohen Effort im nächsten Turn wieder ein und entfernt Opus 4 und 4.1, wobei betroffene Nutzer automatisch auf Opus 4.6 wechseln.

  • Opus 4.6 now defaults to medium effort for Max and Team subscribers. Medium effort works well for most tasks — it's the sweet spot between speed and thoroughness. You can change this anytime with /model
  • Re-introduced the "ultrathink" keyword to enable high effort for the next turn
  • Removed Opus 4 and 4.1 from Claude Code on the first-party API — users with these models pinned are automatically moved to Opus 4.6

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Claude Code von Anthropic

Claude Code 2.1.63: /simplify, /batch und HTTP-Hooks

Neu sind die Slash-Befehle /simplify und /batch, HTTP-Hooks, die JSON per POST an eine URL senden, gemeinsame Projektkonfigurationen und Auto-Memory über Git-Worktrees sowie ein manueller URL-Fallback bei MCP-OAuth, außerdem wurden zahlreiche Speicher- und Listener-Lecks behoben.

  • Added /simplify and /batch bundled slash commands
  • Fixed local slash command output like /cost appearing as user-sent messages instead of system messages in the UI
  • Project configs & auto memory now shared across git worktrees of the same repository
  • Added ENABLE_CLAUDEAI_MCP_SERVERS=false env var to opt out from making claude.ai MCP servers available
  • Improved /model command to show the currently active model in the slash command menu
  • Added HTTP hooks, which can POST JSON to a URL and receive JSON instead of running a shell command
  • Fixed listener leak in bridge polling loop
  • Fixed listener leak in MCP OAuth flow cleanup
  • Added manual URL paste fallback during MCP OAuth authentication. If the automatic localhost redirect doesn't work, you can paste the callback URL to complete authentication.
  • Fixed memory leak when navigating hooks configuration menu
  • Fixed listener leak in interactive permission handler during auto-approvals
  • Fixed file count cache ignoring glob ignore patterns
  • Fixed memory leak in bash command prefix cache
  • Fixed MCP tool/resource cache leak on server reconnect
  • Fixed IDE host IP detection cache incorrectly sharing results across ports
  • Fixed WebSocket listener leak on transport reconnect
  • Fixed memory leak in git root detection cache that could cause unbounded growth in long-running sessions
  • Fixed memory leak in JSON parsing cache that grew unbounded over long sessions …

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Claude Code von Anthropic

Claude Code Version 2.1.62

Eine Regression im Prompt-Suggestion-Cache, die die Cache-Trefferquote senkte, wurde behoben.

  • Fixed prompt suggestion cache regression that reduced cache hit rates

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Claude Code von Anthropic

Claude Code Version 2.1.61

Gleichzeitige Schreibzugriffe, die unter Windows die Konfigurationsdatei beschädigten, wurden behoben.

  • Fixed concurrent writes corrupting config file on Windows

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Claude Code von Anthropic

Claude Code 2.1.59: Auto-Memory und /copy-Auswahl

Claude speichert nützlichen Kontext automatisch im Auto-Memory (verwaltbar über /memory), /copy bietet eine Auswahl einzelner Codeblöcke, und mehrere Fehler bei MCP-OAuth und beschädigten Konfigurationsdateien wurden behoben.

  • Claude automatically saves useful context to auto-memory. Manage with /memory
  • Added /copy command to show an interactive picker when code blocks are present, allowing selection of individual code blocks or the full response.
  • Improved "always allow" prefix suggestions for compound bash commands (e.g. cd /tmp && git fetch && git push) to compute smarter per-subcommand prefixes instead of treating the whole command as one
  • Improved ordering of short task lists
  • Improved memory usage in multi-agent sessions by releasing completed subagent task state
  • Fixed MCP OAuth token refresh race condition when running multiple Claude Code instances simultaneously
  • Fixed shell commands not showing a clear error message when the working directory has been deleted
  • Fixed config file corruption that could wipe authentication when multiple Claude Code instances ran simultaneously

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Claude Code 2.1.56: VS Code-Absturz behoben

In VS Code wurde eine weitere Ursache für Abstürze mit der Meldung "command 'claude-vscode.editor.openLast' not found" behoben.

  • VS Code: Fixed another cause of "command 'claude-vscode.editor.openLast' not found" crashes

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Claude Code 2.1.53: Stabilitätskorrekturen

Behoben wurden unter anderem ein UI-Flackern bei der Eingabe, das Ignorieren von --worktree beim ersten Start, Probleme beim Beenden von Remote Control sowie mehrere Abstürze unter Windows und Linux.

  • Fixed a UI flicker where user input would briefly disappear after submission before the message rendered
  • Fixed bulk agent kill (ctrl+f) to send a single aggregate notification instead of one per agent, and to properly clear the command queue
  • Fixed graceful shutdown sometimes leaving stale sessions when using Remote Control by parallelizing teardown network calls
  • Fixed --worktree sometimes being ignored on first launch
  • Fixed a panic ("switch on corrupted value") on Windows
  • Fixed a crash that could occur when spawning many processes on Windows
  • Fixed a crash in the WebAssembly interpreter on Linux x64 & Windows x64
  • Fixed a crash that sometimes occurred after 2 minutes on Windows ARM64

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Claude Code 2.1.52: VS Code-Absturz unter Windows behoben

Ein Absturz der VS Code-Erweiterung unter Windows mit der Meldung "command 'claude-vscode.editor.openLast' not found" wurde behoben.

  • VS Code: Fixed extension crash on Windows ("command 'claude-vscode.editor.openLast' not found")

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Claude Code 2.1.51: claude remote-control und Sicherheitsfix

Neu ist der Unterbefehl claude remote-control, Plugins können mit eigenen npm-Registries und festen Versionen installiert werden, Tool-Ergebnisse über 50K Zeichen werden auf Platte ausgelagert, und ein Sicherheitsproblem bei statusLine- und fileSuggestion-Hooks ohne Workspace-Trust wurde behoben.

  • Added claude remote-control subcommand for external builds, enabling local environment serving for all users.
  • Updated plugin marketplace default git timeout from 30s to 120s and added CLAUDE_CODE_PLUGIN_GIT_TIMEOUT_MS to configure.
  • Added support for custom npm registries and specific version pinning when installing plugins from npm sources
  • BashTool now skips login shell (-l flag) by default when a shell snapshot is available, improving command execution performance. Previously this required setting CLAUDE_BASH_NO_LOGIN=true.
  • Fixed a security issue where statusLine and fileSuggestion hook commands could execute without workspace trust acceptance in interactive mode.
  • Tool results larger than 50K characters are now persisted to disk (previously 100K). This reduces context window usage and improves conversation longevity.
  • Fixed a bug where duplicate control_response messages (e.g. from WebSocket reconnects) could cause API 400 errors by pushing duplicate assistant messages into the conversation.
  • Added CLAUDE_CODE_ACCOUNT_UUID, CLAUDE_CODE_USER_EMAIL, and CLAUDE_CODE_ORGANIZATION_UUID environment variables for SDK callers to provide account info synchronously, eliminating a race condition where early telemetry events lacked account metadata.
  • Fixed slash command autocomplete crashing when a plugin's SKILL.md description is a YAML array or other non-string type …

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Claude Code 2.1.50: Worktree-Hooks und Agent-Isolation

Neu sind die Hook-Events WorktreeCreate und WorktreeRemove, isolation: worktree in Agent-Definitionen und eine startupTimeout-Einstellung für LSP-Server, dazu kommen mehrere Korrekturen bei Speicherlecks, Sessions und CLAUDE_CODE_SIMPLE.

  • Added support for startupTimeout configuration for LSP servers
  • Added WorktreeCreate and WorktreeRemove hook events, enabling custom VCS setup and teardown when agent worktree isolation creates or removes worktrees.
  • Fixed a bug where resumed sessions could be invisible when the working directory involved symlinks, because the session storage path was resolved at different times during startup. Also fixed session data loss on SSH disconnect by flushing session data before hooks and analytics in the graceful shutdown sequence.
  • Linux: Fixed native modules not loading on systems with glibc older than 2.30 (e.g., RHEL 8)
  • Fixed memory leak in agent teams where completed teammate tasks were never garbage collected from session state
  • Fixed CLAUDE_CODE_SIMPLE to fully strip down skills, session memory, custom agents, and CLAUDE.md token counting
  • Fixed /mcp reconnect freezing the CLI when given a server name that doesn't exist
  • Fixed memory leak where completed task state objects were never removed from AppState
  • Added support for isolation: worktree in agent definitions, allowing agents to declaratively run in isolated git worktrees.
  • CLAUDE_CODE_SIMPLE mode now also disables MCP tools, attachments, hooks, and CLAUDE.md file loading for a fully minimal experience.
  • Fixed bug where MCP tools were not discovered when tool search is enabled and a prompt is passed in as a launch argument …

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Claude Code 2.1.49: --worktree-Flag und Hintergrund-Agents

Neu sind das Flag --worktree (-w) für isolierte Git-Worktrees, Subagents mit Worktree-Isolation, Agents mit background: true, Ctrl+F zum Beenden von Hintergrund-Agents und Plugin-Standardeinstellungen per settings.json, während Sonnet 4.5 mit 1M Kontext im Max-Plan zugunsten von Sonnet 4.6 entfällt.

  • Improved MCP OAuth authentication with step-up auth support and discovery caching, reducing redundant network requests during server connections
  • Added --worktree (-w) flag to start Claude in an isolated git worktree
  • Subagents support isolation: "worktree" for working in a temporary git worktree
  • Added Ctrl+F keybinding to kill background agents (two-press confirmation)
  • Agent definitions support background: true to always run as a background task
  • Plugins can ship settings.json for default configuration
  • Fixed file-not-found errors to suggest corrected paths when the model drops the repo folder
  • Fixed Ctrl+C and ESC being silently ignored when background agents are running and the main thread is idle. Pressing twice within 3 seconds now kills all background agents.
  • Fixed prompt suggestion cache regression that reduced cache hit rates.
  • Fixed plugin enable and plugin disable to auto-detect the correct scope when --scope is not specified, instead of always defaulting to user scope
  • Simple mode (CLAUDE_CODE_SIMPLE) now includes the file edit tool in addition to the Bash tool, allowing direct file editing in simple mode.
  • Permission suggestions are now populated when safety checks trigger an ask response, enabling SDK consumers to display permission options
  • Sonnet 4.5 with 1M context is being removed from the Max plan in favor of our frontier Sonnet 4.6 model, which now has 1M context. Please switch in /model. …

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Claude Code von Anthropic

Claude Code 2.1.47: Windows-Fixes und bessere Performance

Mehrere Windows-Darstellungs- und Ausgabefehler wurden behoben, die VS Code-Planvorschau verbessert, und Speichernutzung, Startzeit sowie @-Dateierwähnungen sind schneller bzw. sparsamer.

  • Fixed FileWriteTool line counting to preserve intentional trailing blank lines instead of stripping them with trimEnd().
  • Fixed Windows terminal rendering bugs caused by os.EOL (\r\n) in display code — line counts now show correct values instead of always showing 1 on Windows.
  • Improved VS Code plan preview: auto-updates as Claude iterates, enables commenting only when the plan is ready for review, and keeps the preview open when rejecting so Claude can revise.
  • Fixed a bug where bold and colored text in markdown output could shift to the wrong characters on Windows due to \r\n line endings.
  • Fixed compaction failing when conversation contains many PDF documents by stripping document blocks alongside images before sending to the compaction API (anthropics/claude-code#26188)
  • Improved memory usage in long-running sessions by releasing API stream buffers, agent context, and skill state after use
  • Improved startup performance by deferring SessionStart hook execution, reducing time-to-interactive by ~500ms.
  • Fixed an issue where bash tool output was silently discarded on Windows when using MSYS2 or Cygwin shells.
  • Improved performance of @ file mentions - file suggestions now appear faster by pre-warming the index on startup and using session-based caching with background refresh.
  • Improved memory usage by trimming agent task message history after tasks complete …

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Claude Code 2.1.45: Unterstützung für Claude Sonnet 4.6

Claude Sonnet 4.6 wird unterstützt, es gibt die Einstellung spinnerTipsOverride und neue SDK-Rate-Limit-Typen, außerdem wurden diverse Fehler bei Agent Teams, Sandbox, Plugins und Autovervollständigung behoben.

  • Added support for Claude Sonnet 4.6
  • Added support for reading enabledPlugins and extraKnownMarketplaces from --add-dir directories
  • Added spinnerTipsOverride setting to customize spinner tips — configure tips with an array of custom tip strings, and optionally set excludeDefault: true to show only your custom tips instead of the built-in ones
  • Added SDKRateLimitInfo and SDKRateLimitEvent types to the SDK, enabling consumers to receive rate limit status updates including utilization, reset times, and overage information
  • Fixed Agent Teams teammates failing on Bedrock, Vertex, and Foundry by propagating API provider environment variables to tmux-spawned processes (anthropics/claude-code#23561)
  • Fixed sandbox "operation not permitted" errors when writing temporary files on macOS by using the correct per-user temp directory (anthropics/claude-code#21654)
  • Fixed Task tool (backgrounded agents) crashing with a ReferenceError on completion (anthropics/claude-code#22087)
  • Fixed autocomplete suggestions not being accepted on Enter when images are pasted in the input
  • Fixed skills invoked by subagents incorrectly appearing in main session context after compaction
  • Fixed excessive .claude.json.backup files accumulating on every startup
  • Fixed plugin-provided commands, agents, and hooks not being available immediately after installation without requiring a restart …

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Claude Code von Anthropic

Claude Code Version 2.1.44

ENAMETOOLONG-Fehler bei tief verschachtelten Verzeichnispfaden und Fehler bei der Authentifizierungsaktualisierung wurden behoben.

  • Fixed ENAMETOOLONG errors for deeply-nested directory paths
  • Fixed auth refresh errors

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Claude Code 2.1.42: Schnellerer Start und bessere Cache-Trefferquote

Der Start wurde beschleunigt, die Prompt-Cache-Trefferquote durch Auslagern des Datums aus dem System-Prompt verbessert, ein einmaliger Opus 4.6 Effort-Hinweis eingeführt und Fehler bei /resume sowie Bildgrößenlimits behoben.

  • Improved startup performance by deferring Zod schema construction
  • Improved prompt cache hit rates by moving date out of system prompt
  • Added one-time Opus 4.6 effort callout for eligible users
  • Fixed /resume showing interrupt messages as session titles
  • Fixed image dimension limit errors to suggest /compact

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