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The app is how people see and edit a brain without opening GitHub. It renders inside the conversation in hosts that support MCP Apps, claude.ai among them, and the same app runs as an ordinary web page for anyone who is not in the conversation.
The Isomorphic page viewer

The page viewer: frontmatter as properties, a computed table, and linked references below.

Ask Claude to “show me my brain” or to open a page, and it opens the app. The app has no privileges of its own: everything it shows or changes goes through the same tools Claude uses, at your role, so it can never do something you could not.

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Opening it in a browser

Every page has a web address, https://<server>/b/<owner>/<repo>/<path>, that anyone with access to the brain can open. They sign in with the same email link and need no Claude account. Ask Claude to share a page and it gives you the link. Locally, pnpm try serves the app at http://127.0.0.1:8788/b/local/<folder>.

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What is in it

  • Viewer. Rendered markdown with working links in both styles. Frontmatter appears as a properties panel. Computed views render live, and every page ends with the pages that link to it. A refresh control shows the page’s age and says when it changed underneath you.
  • File tree. Clicking a folder opens its folder note. A folder without one offers to create it, already holding a listing of the folder.
  • Search, with ranked results and the lines that matched.
  • Link graph, with pages sized by how many links touch them and colored by folder.
  • Activity: who changed what, and when, for the brain or for one page.
  • Brain switcher, when you can reach more than one brain.
  • Sharing, members and analytics, each shown only to people whose role can use them.
It follows the host’s light or dark theme, respects reduced motion, and can be shown inline, fullscreen, or picture-in-picture.
The Isomorphic link graph

The link graph over a 37-page brain.

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The editor

A rich-text editor that saves the markdown you would have written by hand. That is the whole design constraint: a brain is read on github.com, in Obsidian and by agents, so an editor that reformatted every page it touched would make every change unreadable.
The Isomorphic editor

The editor: a formatting toolbar, the page's properties, and the body as rich text, saved back as plain markdown.

  • Formatting: headings, bold, italic, inline code, bulleted, numbered and checklist items, quotes, and tables with resizable columns. Undo and redo with the usual shortcuts.
  • Properties are edited in their own panel and saved with the body.
  • Images: paste or drop a file. It is stored in the brain beside the page and embedded as a normal image link. Saving waits for the upload, so a page never links to a missing file.
  • Faithful saves. Wikilinks, list markers and tables come back exactly as written, and frontmatter the editor does not show is never touched.
  • No lost work. If someone else changed the page after you opened it, the save is refused and your text stays on screen instead of overwriting theirs. On a protected branch, a save goes into the brain’s open pull request (or opens one), and the editor says so.