Claude Code April 2026: Flicker-Free Rendering, Named Subagents, PowerShell Permissions, /powerup Interactive Lessons
Claude Code’s April 2026 update is developer-dense. Six meaningful features across rendering, subagent management, permissions, and interactivity. Here’s the breakdown. Flicker-Free Alt-Screen Rendering Enable CLAUDE_CODE_NO_FLICKER=1 to switch to flicker-free alt-screen rendering. If you’ve been running Claude Code in terminal sessions with frequent output updates and experiencing rendering flicker, this is the fix. The alt-screen approach keeps the output stable during rapid updates rather than repainting the full terminal — a quality-of-life improvement that matters disproportionately in pipeline contexts where Claude Code is producing continuous output while running tasks. ...