# description
Server response to a successful handshake request, establishing session context.

# properties.sessionId.description
Unique session identifier. Clients MUST include this in subsequent requests.

# properties.serverDid.description
The server's DID used for proof verification.

# properties.protocolVersion.description
Negotiated KYA-OS protocol version (e.g., '1.0').

# properties.serverCapabilities.description
Server capability flags indicating supported features.

# properties.serverCapabilities.properties.proofs.description
Server supports detached proofs on tool responses.

# properties.serverCapabilities.properties.delegation.description
Server supports W3C delegation credentials.

# properties.sessionTtl.description
Session time-to-live in seconds. Client SHOULD refresh before expiration.

# properties.nonce.description
Echo of the client's nonce for binding verification.