Claude Code v2.1.191: /rewind, CPU fixes, MCP reliability improvements
Anthropic released Claude Code v2.1.191 with a handful of fixes and improvements that directly affect daily agent usage. Notable additions include /rewind support, a ~37% CPU reduction during streaming, and several MCP reliability enhancements.
New command: /rewind
/rewind now lets you resume a conversation from before a /clear was run. If you accidentally wiped context, you can restore the prior session without restarting from scratch.
CPU usage and memory
Streaming response CPU usage is reduced by ~37% via coalescing text updates to a 100ms interval. Long-session memory growth from terminal output cache has also been reduced.
Agent fixes
- Stopping an agent from the tasks panel is now permanent — background agents no longer resurrect after being stopped.
- Builtin slash commands (like
/usage) sent to background sessions now show a hint instead of being passed as prompt text. - Job rows for pasted images now display
[Image #N]placeholder instead of full filesystem paths.
MCP improvements
- Capability discovery (
tools/list,prompts/list,resources/list) now retries on transient network errors with short backoff. - MCP OAuth discovery and token requests retry once after transient errors; headless environments skip the browser popup and go straight to the paste-the-URL prompt.
- HTTP 404 errors now show the URL and point to your MCP config.
Other fixes
- Scroll position no longer jumps to the bottom while reading earlier output during a streaming response.
/voicenow explains the organizational restriction instead of showing a generic message./loginURL no longer gets truncated in Windows Terminal when it wraps across lines.- Cmd+click on links in fullscreen mode works again for Ghostty over ssh/tmux.
- Hooks with comma-separated matchers (e.g.,
"Bash,PowerShell") now fire correctly. /permissionsRecently-denied tab: approving a denial now persists on close.- Managed settings:
forceRemoteSettingsRefreshnow works via MDM or file policy, and the fetch sendsCache-Control: no-cacheto prevent stale proxy responses. - Sandbox network permission dialog now remembers hosts allowed with "Yes" for the session.
- Vim mode prompt-history search (NORMAL
/) hints how to reach slash commands.
📖 Read the full source: GitHub Claude-Code
👀 See Also
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