Review code inline in your real files — diff in the gutter, comments in the margin — then hand your notes to Claude.
A VS Code / Cursor extension for reviewing changes in place. Instead of bouncing to GitHub's web UI or a separate diff tab, Loupe overlays the diff onto the files you're already editing (with full language-server context), lets you leave inline comments anywhere, and exports those comments as clean markdown for Claude Code — or for your own notes.
Reviewing on github.com is slow and collapses the surrounding context. The official PR extension is better but forces every file into a dedicated diff tab. Loupe takes a different stance:
- Comments are always on. You don't need a PR or "review mode" to annotate code.
- Review mode is just the diff. Toggle it to paint change-bars over your real editors and list the changed files.
- Reviewing your own / an agent's work is a first-class flow — leave notes, then copy them straight back to Claude.
- Inline comments, anywhere. Gutter
+on any file, right-click → Add Comment, orCmd/Ctrl+Alt+M. Select multiple lines to comment on a range. Comments persist across reloads. - Diff overlay (review mode).
Cmd/Ctrl+Alt+Rtoggles it. Choose Whole branch vs main (review committed branch work — great for agent commits) or Uncommitted changes. Change-bars render in your real editors; changed files show in the sidebar. - Copy for Claude.
Cmd/Ctrl+Alt+C(or the status-bar item / sidebar button) copies every comment as markdown — file path, line range, code snippet, and your note — ready to paste into Claude Code. - Comments & Changes sidebar with per-file comment counts, plus Clear All Comments.
| Command | Keybinding |
|---|---|
| Loupe: Toggle Review Mode (diff) | Cmd/Ctrl+Alt+R |
| Loupe: Add Comment (at cursor) | Cmd/Ctrl+Alt+M |
| Loupe: Copy Comments | Cmd/Ctrl+Alt+C |
| Loupe: Clear All Comments | — |
All keybindings are rebindable in Keyboard Shortcuts (search "loupe").
From your editor — open the Extensions view, search Loupe, and click Install:
- VS Code → Visual Studio Marketplace
- Cursor / VSCodium → Open VSX
From the command line:
code --install-extension jonahseguin.loupe # VS Code
cursor --install-extension jonahseguin.loupe # Cursor (resolves from Open VSX)git clone git@github.com:jonahseguin/loupe.git
cd loupe
npm install
npm run package # builds loupe-<version>.vsix
cursor --install-extension loupe-*.vsix # or: code --install-extension loupe-*.vsixThen reload the editor. (During development you can also press F5 to launch an Extension Development Host.)
npm test # compile + run the test suite in a VS Code test host
npm run bundle # esbuild production bundle -> dist/extension.js
npm run package # produce the .vsix
node scripts/gen-icon.mjs # regenerate resources/icon.pngBuilt with TypeScript and the VS Code extension API. Git access is via the git CLI (no native dependencies). The core is source-agnostic: a comment/session layer that's independent of the diff overlay, so future layers (GitHub PRs, worktree-isolated review) can plug into the same engine.
MIT © Jonah Seguin