---
title: "Claude Code v2.1.191: Performance Optimization, MCP Reliability Upgrades, and UX Improvements"
source: "Claude Code：GitHub Releases（RSS）"
source_tier: "t1_5"
url: "https://github.com/anthropics/claude-code/releases/tag/v2.1.191"
permalink: "https://feed.astralor.com/items/itm_046437509ea59bc3a6ca4624"
published: "2026-06-24T21:58:12.000Z"
score: 68
channel: "ai"
tags: ["Anthropic","Claude Code","MCP","Performance Optimization"]
---

# Claude Code v2.1.191: Performance Optimization, MCP Reliability Upgrades, and UX Improvements

## At a glance

Claude Code v2.1.191 brings several important updates: new /rewind command to resume conversation after /clear, fixed scroll position jumping during streaming, permanent stop for background agents, and /login URL truncation in Windows Terminal. MCP server capability discovery and OAuth flow now retry transient network errors, and sandbox network permission prompts are remembered per session. CPU usage during streaming is reduced by ~37%, and long-session memory growth is improved.

## Key points

- New /rewind command to resume conversation after /clear
- ~37% reduction in CPU usage during streaming responses
- MCP server capability discovery and OAuth now retry on transient errors for improved reliability
- Sandbox network permission prompts remembered for the rest of the session

## Full text

What's changed Added /rewind support for resuming a conversation from before /clear was run Fixed scroll position jumping to the bottom while reading earlier output during a streaming response Fixed background agents resurrecting after being stopped — stopping an agent from the tasks panel is now permanent Fixed /voice showing a generic "not available" message when disabled by an organization's policy — it now explains the restriction Fixed /login URL opening truncated in Windows Terminal when it wraps across lines Fixed Cmd+click on links in fullscreen mode for Ghostty over ssh/tmux Fixed claude agents sending builtin slash commands like /usage to background sessions as prompt text instead of showing a hint Fixed claude agents job rows showing full filesystem paths for pasted images instead of the [Image #N] placeholder Fixed hooks with comma-separated matchers (e.g. "Bash,PowerShell") silently never firing Fixed /permissions Recently-denied tab: approving a denial now persists on close instead of being silently discarded Fixed the agent panel jumping by one row when scrolling the roster past the overflow cap Fixed the welcome splash art overflowing the default 80×24 macOS Terminal window Fixed managed settings: forceRemoteSettingsRefresh now takes effect when set via MDM or file policy, and the fetch sends Cache-Control: no-cache to prevent proxies from serving stale responses Improved sandbox network permission dialog: hosts you allow with "Yes" are now remembered for the rest of the session instead of re-prompting on every connection Improved MCP server reliability: capability discovery (tools/list, prompts/list, resources/list) now retries transient network errors with short backoff Improved MCP OAuth: discovery and token requests now retry once after transient network errors, and headless environments skip the browser popup and go straight to the paste-the-URL prompt Improved MCP error messages: HTTP 404 errors now show the URL and point to your MCP config Improved vim mode prompt-history search (NORMAL /) to hint how to reach slash commands Reduced CPU usage during streaming responses by ~37% by coalescing text updates to 100ms Reduced long-session memory growth from terminal output cache

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