Stream modes: values, updates, messages, custom

Autonomy is invisible today: Impulse rolls a dice and you find out from a log later. This module streams a graph run node-by-node into a browser panel, the same SSE pattern cockpit already uses. You will watch a dice roll happen live from your phone.

Streaming turns one blocking call into a sequence of events. Instead of await graph.invoke(...) returning once at the end, graph.stream(...) yields chunks as the graph runs.

for await (const chunk of await graph.stream(inputs, { streamMode: "updates" })) {
  // chunk is the state delta from the node that just ran
}

Stream modes decide what each chunk contains: values is the full state after each step; updates is only the delta each node returned (best for "which node just ran and what did it write"); messages is LLM tokens as they generate, for typewriter output; custom is arbitrary events you emit yourself from inside a node.

for await (const [mode, chunk] of await graph.stream(inputs, {
  streamMode: ["updates", "custom"],
})) {
  if (mode === "custom") renderDiceEvent(chunk);
  else lightUpNode(chunk);
}

Pass an array to combine modes; chunks then arrive as [mode, chunk] tuples so you can tell them apart.