Claude-Code v2.1.94 adds Mantle support, fixes critical bugs

Claude-Code v2.1.94 Release Notes

Claude-Code v2.1.94 adds new features and fixes multiple bugs across the AI coding assistant's core functionality, plugin system, and VS Code integration.

New Features

• Amazon Bedrock with Mantle support: Enable with CLAUDE_CODE_USE_MANTLE=1 environment variable
• Default effort level change: Changed from medium to high for API-key, Bedrock/Vertex/Foundry, Team, and Enterprise users. Control with /effort command
• Slack MCP improvements: Added compact Slacked #channel header with clickable channel link for send-message tool calls
• Plugin system enhancements: Added keep-coding-instructions frontmatter field support for plugin output styles
• Session title hooks: Added hookSpecificOutput.sessionTitle to UserPromptSubmit hooks for setting session titles
• Stable plugin skill names: Skills declared via "skills": ["./"] now use the skill's frontmatter name instead of directory basename

Bug Fixes

• Rate limit handling: Fixed agents appearing stuck after 429 rate-limit responses with long Retry-After headers - errors now surface immediately
• macOS login: Fixed Console login silently failing with "Not logged in" when login keychain is locked or password out of sync. Error now surfaces and claude doctor diagnoses the fix
• Plugin system fixes: Fixed plugin skill hooks defined in YAML frontmatter being silently ignored; fixed plugin hooks failing with "No such file or directory" when CLAUDE_PLUGIN_ROOT not set; fixed ${CLAUDE_PLUGIN_ROOT} resolving to marketplace source directory instead of installed cache for local-marketplace plugins
• UI/UX improvements: Fixed scrollback showing same diff repeated and blank pages in long-running sessions; fixed multiline user prompts in transcript indenting wrapped lines under ❯ caret instead of under text; fixed Shift+Space inserting literal word "space" instead of space character in search inputs
• Terminal rendering: Fixed hyperlinks opening two browser tabs when clicked inside tmux running in xterm.js-based terminals (VS Code, Hyper, Tabby); fixed alt-screen rendering bug where content height changes mid-scroll could leave compounding ghost lines
• Environment variable handling: Fixed FORCE_HYPERLINK environment variable being ignored when set via settings.json env
• Accessibility: Fixed native terminal cursor not tracking selected tab in dialogs, enabling screen readers and magnifiers to follow tab navigation
• Bedrock compatibility: Fixed Bedrock invocation of Sonnet 3.5 v2 by using the us. inference profile ID
• Session management: Fixed SDK/print mode not preserving partial assistant response in conversation history when interrupted mid-stream; improved --resume to resume sessions from other worktrees of same repo directly instead of printing a cd command
• Text encoding: Fixed CJK and other multibyte text being corrupted with U+FFFD in stream-json input/output when chunk boundaries split UTF-8 sequences

VS Code Specific Fixes

• Reduced cold-open subprocess work on starting a session
• Fixed dropdown menus selecting wrong item when mouse was over list while typing or using arrow keys
• Added warning banner when settings.json files fail to parse, alerting users that permission rules aren't being applied