a client that allows you to learn about the protocol and use it directly: NIP command for reading NIPs, links to NIP opened inside the client. KIND command for learning about a specific kind and which NIP it originates from. a REQ command that allows you to make requests to one or more relays with the full nostr query language. an EVENT command for signing events, and so on.

it's a raw protocol client with a barebones UI that you can use to create any client experience you'd like and debug protocol issues if that makes sense. like having nak on the browser with a tmux-like window system and everything driven by commands.