ThreadStreamOptions

Optional fetch override, forwarded to the SSE transport. Useful for auth proxies, Next.js route handlers, or tests with injected mocks. Ignored when webSocketFactory is also supplied.

Starting command ID for the internal command counter. Mostly useful for tests.

How this thread talks to the agent server. Accepts either a built-in transport string or a custom AgentServerAdapter:

• "sse": HTTP commands + one SSE event stream per subscription.
• "websocket": single bidirectional WebSocket.
• an AgentServerAdapter: custom transport that replaces the built-in factories entirely. fetch / webSocketFactory are ignored in this mode.

Defaults to the client-level streamProtocol ("v2-websocket" → "websocket", otherwise "sse").

Optional WebSocket factory. Supplying it flips the adapter into WebSocket mode — SSE is bypassed entirely.