Split diff view for Claude Code

A Claude Code mod that draws the diff of every Edit and Write in two side-by-side columns instead of one stacked -/+ list:

• removed lines on the left, added lines on the right
• each side keeps its real line numbers
• a changed line sits next to the line that replaced it
• long runs between hunks collapse to ⋯ N unchanged lines
• colors are Claude Code's own diff colors (diffRemoved / diffAdded theme keys), so they follow your /theme
• syntax highlighting comes from Claude Code's own highlighter (the Code element, the one the built-in /diff pane uses), with the language taken from the file's extension

Errors, edits held for review, brand-new files and anything without a diff keep Claude Code's normal drawing.

Requirements

• Claude Code v2.1.287 or later (the version that introduced mods; they are on by default). Check with claude --version.
• Mods must be allowed to load: not started with --safe-mode or --bare, and not blocked by your organization's managed settings.

Install

From a terminal:

claude plugin marketplace add neteye-platform/cc-split-diff-view
claude plugin install cc-split-diff-view@neteye-platform

Or from inside a Claude Code session:

/plugin marketplace add neteye-platform/cc-split-diff-view
/plugin install cc-split-diff-view@neteye-platform

No download or build step is needed: Claude Code fetches the repository and loads the TypeScript directly. Start a new session (or run /reload-plugins), then ask Claude to edit a file.

To check it loaded, run /plugin and look for cc-split-diff-view under Installed.

Update

Claude Code caches an installed plugin by version, so updates arrive when the version in .claude-plugin/plugin.json is bumped:

claude plugin marketplace update neteye-platform

Uninstall

claude plugin uninstall cc-split-diff-view@neteye-platform

You can also turn it off without removing it from the Installed tab of /plugin.

Try it for one session without installing

git clone https://github.com/neteye-platform/cc-split-diff-view.git
claude --plugin-dir ./cc-split-diff-view

The mod hot-reloads when you save a file in that directory.

Limitations

• Only Edit and Write are redrawn. The permission prompt is not a render site, so a mod cannot change it.
• Each line is highlighted on its own, so something that spans lines (a block comment or a template string) can be colored as plain code when only part of it is in the diff.
• Hooks stay active in the VS Code extension, claude -p and cloud sessions, but the interface part only draws in the terminal and the Desktop app's Code tab.
• Mod events and render-site props can change between Claude Code releases. If the diff suddenly looks like the default again, run claude plugin validate . and check the debug log.

Credits

Developed by Oscar Zambotti (@oskarnrk) in the NetEye Platform development team, with Claude Code.