Installing boards

Persephone keeps its core small. Viewers for Word, Excel, PowerPoint, PDF, draw.io or SQLite files are boards in the board catalog, installed when you first need them. Open a file that has no viewer yet, click +, and Persephone offers the boards that can open it.

A .docx opens as a ZIP archive until a viewer is installed: + → Download → Register board → Trust, and the report opens in Word Viewer. Tools & Editors then lists every board.

Core features

Offered where you need it. When no installed editor fits a file type, the editor switch shows +. It opens Board Info with the catalog boards that can open that file.
Two explicit steps. Download fetches the board, verifies its checksum and unpacks it. Nothing runs yet: you, or your AI agent, can read its files first. Register board then asks for your trust.
You decide what it may do. The trust dialog lists the permissions the board declares, such as running programs, file access or network. A viewer like Word Viewer asks for none.
Next to the built-in editors. Once trusted, the board appears in the editor switch for its file types, so you can flip between Archive and Word on the same page.
Updates and rollback. Board Info lists every published version. Install a newer one or roll back; the old folder is replaced only after the new version downloads and verifies.
Everything in one place. Tools & Editors → Boards lists all your boards: the ones you installed and the ones your agent built for your projects.

Why it helps

A small, fast app. You download a 3.5 MB PDF viewer only if you open PDFs.
No mystery code. Nothing from the catalog runs until you trust it, and it gets only the permissions it declared.
The same mechanism as your own boards. Catalog viewers are ordinary boards, so your agent can build one for a format the catalog doesn’t cover.

Try it

Open a .docx, .xlsx, .pdf or .drawio file and click + in the editor switch.
Or browse the whole catalog: open Tools & Editors, click Open in new tab, then Search boards.