Claude Code v2.1.121: /ultrareview public preview + Opus 4.7 xhigh effort

[claude-yolo]

WHY: Major version with significant user-facing features

Key highlights that users should know about:

🚀 New Features:

• /ultrareview now in public preview - advanced code review capabilities
• Opus 4.7 with new xhigh effort level for maximum quality
• claude plugin prune command for cleaning orphaned dependencies
• Skills search filtering (/skills now has type-to-filter search)

🔧 Quality Improvements:

• MCP alwaysLoad option for better tool availability
• PostToolUse hooks can now replace tool output for all tools
• Fullscreen mode scroll improvements
• Better URL handling in wrapped text
• Auto-retry for MCP server transient errors

📊 Platform:

• Vertex AI X.509 certificate support
• OpenTelemetry enhancements
• Faster startup after upgrades

Related PR: #897
Docs updated: 2026-04-28

/cc @lroolle - significant version with major user features