Claude Code mod
redpen
Line-by-line review pane: comment on what Claude changed, then send every comment back as one prompt.
Install
/plugin marketplace add joonhyukyim/redpen
/plugin install redpen@redpenMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: drives Claude, reads files, reads env vars, reads the transcript, reads mod state, draws
- Sees
- Edit calls, Write calls, NotebookEdit calls
- Draws in
Pane- Hooks
session.startcommand.runprompt.autocompleteturn.startturn.completetool.callui.focusui.render
From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.
How Claude Code mods work
- A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
- It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
- Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
- Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.
Details
- Repository
- joonhyukyim/redpen
- Folder
.- Marketplace
redpen- Author
- joonhyuk
- License
- MIT
- Last updated
- 11 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is redpen?
Line-by-line review pane: comment on what Claude changed, then send every comment back as one prompt. It is a mod for Claude Code, from joonhyukyim/redpen on GitHub.
What can the redpen mod access?
Its widest reach is "writes or runs" (drives Claude, reads files, reads env vars, reads the transcript, reads mod state, draws). It sees Edit calls, Write calls, NotebookEdit calls. It draws in Pane. Like any mod, it runs with your permissions.
How do I install redpen?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add joonhyukyim/redpen and then /plugin install redpen@redpen.
Is redpen popular?
joonhyukyim/redpen has 4 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 11 October 2026.
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