Claude Code Weekly Updates (2.1.89 - 2.1.92)

Here are the Claude Code changes from March 30 to April 5, 2026 that caught my attention.

TL;DR

• version: 2.1.89 -> 2.1.92
• changes: 105
• Important topics
  • CLAUDE_CODE_NO_FLICKER flicker-free mode
  • /powerup interactive learning command
  • Ultraplan
  • Third-party tool usage restrictions
  • Claude Code npm source map leak accident

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v2.1.89 (52 changes)

CLAUDE_CODE_NO_FLICKER=1

Added CLAUDE_CODE_NO_FLICKER=1 environment variable to opt into flicker-free alt-screen rendering with virtualized scrollback

A flicker-free alt-screen rendering mode with virtualized scrollback has been introduced. Set CLAUDE_CODE_NO_FLICKER=1 as an environment variable to opt in. The chat input stays fixed at the bottom of the screen with no flickering, making it quite comfortable. The user experience is quite different from before, so it may take some time to get used to.

PermissionDenied hook

Added PermissionDenied hook that fires after auto mode classifier denials — return {retry: true} to tell the model it can retry

A new hook that fires after the auto mode classifier denies a permission. Return {retry: true} to notify the model it can retry. Useful for customizing auto mode behavior.

As a side note, v2.1.88 was released on March 31, but a source map file was discovered in the npm package, and it was rolled back the same day. The CHANGELOG has no v2.1.88 entry, and the version number jumps directly from 2.1.87 to 2.1.89. Details on the source code leak are covered in the Other Topics section below.

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v2.1.90 (19 changes)

/powerup command

Added /powerup — interactive lessons teaching Claude Code features with animated demos

The /powerup command has been added, providing interactive lessons with animated demos to learn Claude Code features directly within the tool.

Currently there are 10 items covering @ file references, Shift+Tab mode switching, /rewind undo, background tasks, CLAUDE.md, and more. You can mark each as completed to track your progress.

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v2.1.91 (13 changes)

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v2.1.92 (21 changes)

/release-notes interactive version picker

/release-notes is now an interactive version picker

The /release-notes command now features an interactive version picker with change counts displayed, making it easier to browse specific version changes.

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Other Claude Code Topics

Source code leak incident

On March 31, v2.1.88 was released with cli.js.map (59.8MB), a source map file, accidentally included in the npm package. This source map allowed recovery of approximately 1,906 TypeScript files totaling around 512,000 lines of source code. This was actually the second time the same root cause led to a source map leak; the first occurred in February 2025. This time, it was due to a developer oversight at Anthropic.

Third-party tool restrictions and extra credits

Starting April 4 (April 5 at 4 AM JST), Claude subscription usage can no longer be used with third-party tools like OpenClaw. Users who need third-party tool access must use subscription extra usage or API pay-per-use billing.

As compensation, Anthropic is distributing extra usage credits equal to your monthly subscription amount. Credits must be claimed by April 17 and are valid for 90 days after claiming.

https://claude.ai/settings/usage

This usage restriction was previously prohibited under the terms of service and has now been explicitly enforced.

/buddy April Fools

On April 1, the official Claude Code April Fools feature /buddy was released. Running the command hatches a companion creature that sits beside your chat input.

You can see the various Buddy species in the replies and quotes of the following post.

computer-use CLI support

computer-use has been added to the Claude Code CLI. Previously only available in the Desktop version, computer-use can now be enabled from /mcp in the CLI. Requires Pro or Max plan. Only one session can use it at a time, and apps are hidden while Claude is working. Unlike the Desktop version, denied app lists are not yet supported.

Windows support for computer-use was also announced on April 3.

Ultraplan

Ultraplan has been added to Claude Code, accessible via three methods:

• The /ultraplan command
• Asking Claude to use ultraplan in your prompt
• Selecting “refine with Ultraplan” in Plan mode (Claude Code on the Web)

This mode performs deeper analysis and design than regular Plan mode and runs in the cloud. It is not explicitly mentioned in the CHANGELOG, suggesting a gradual rollout.

/teleport command

The /teleport command has been quietly added to Claude Code. It allows you to resume Claude Code on the Web remote sessions linked to a GitHub repository in your local environment. This command was listed in the v2.1.0 CHANGELOG but had never actually worked until now.

OpenAI Codex plugin for Claude Code

OpenAI released a Codex plugin for Claude Code, enabling review and task delegation capabilities from within Claude Code.

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Closing

Thank you for reading!