This site contains all the documentation and specification of protocols related to Magic Wormhole, which are not specific to a single client or implementation. It assumes the reader is already familiar with the general Magic Wormhole concept.
The most important component is the Mailbox server. There are two aspects to it: The server protocol describes how two peers find each other and how they then can exchange low-bandwidth messages. Once the two peers are connected over the server, the client protocol describes how they establish a secure way of exchanging messages.
Using the established low-bandwidth secure channel, both sides then negotiate a secure high-bandwidth channel, called transit. The transit protocol describes how both sides establish a direct connection, how a special relay server may be used as fallback, and the cryptography used to make that connection secure.
Applications make use of the above protocols to provide their functionality. Currently, only one application level protocol is documented here: file transfer. Additionally, a custom uri scheme has been standardised for file transfer. This makes it possible for applications to replace the traditional code exchange with sharing a link or QR code.
Security threat models and privacy considerations are discussed in security