[Release] anthropics/claude-code v2.1.84: v2.1.84

Claude Code v2.1.84 introduces PowerShell tool support for Windows, enhanced environment variable controls for model configuration, new hooks for task and worktree creation, and numerous bug fixes and performance improvements. Key additions include idle timeout configuration, channel plugin allowlists, deep link improvements, and better MCP server handling. The release also addresses critical issues with voice input, workflow subagents, and terminal rendering while improving startup performance and prompt cache efficiency.

Key Points

• •PowerShell tool now available as opt-in preview for Windows users
• •New environment variables for model capability detection and customization: ANTHROPIC_DEFAULT_{OPUS,SONNET,HAIKU}_MODEL_SUPPORTS, _MODEL_NAME, _DESCRIPTION
• •Configure streaming idle watchdog with CLAUDE_STREAM_IDLE_TIMEOUT_MS (default 90s)
• •TaskCreated hook fires when tasks are created via TaskCreate; WorktreeCreate hook now supports HTTP type with worktreePath return
• •allowedChannelPlugins managed setting enables team/enterprise admins to define channel plugin allowlists
• •MCP tool descriptions capped at 2KB to prevent context bloat; local MCP configs now deduplicate with claude.ai connectors (local wins)
• •Rules and skills paths frontmatter now accepts YAML list of globs for flexible path matching
• •Fixed critical issues: voice push-to-talk character leakage, workflow subagents API 400 errors with JSON schema, MCP cache leaks on reconnect
• •Improved startup performance by ~30ms through parallel setup() execution and faster stats screenshot (16× faster)
• •Enhanced user experience: idle-return prompt after 75+ minutes, better dangerous removal detection for Windows drives, improved Remote Control blocking reasons

Workflow Diagram

Concepts