Menu
Language
Theme
A message or packet to send to a specific node in the graph.
The Send class is used within a StateGraph's conditional edges to
dynamically invoke a node with a custom state at the next step.
Importantly, the sent state can differ from the core graph's state, allowing for flexible and dynamic workflow management.
One such example is a "map-reduce" workflow where your graph invokes the same node multiple times in parallel with different states, before aggregating the results back into the main graph's state.
Optional per-task timeout policy that overrides the target node's timeout
for this specific pushed task. A bare number is treated as a hard
runTimeout (in milliseconds).
import { Annotation, Send, StateGraph } from "@langchain/langgraph";
const ChainState = Annotation.Root({
subjects: Annotation<string[]>,
jokes: Annotation<string[]>({
reducer: (a, b) => a.concat(b),
}),
});
const continueToJokes = async (state: typeof ChainState.State) => {
return state.subjects.map((subject) => {
return new Send("generate_joke", { subjects: [subject] });
});
};
@remarks
A per-task timeout can be supplied via the third argument's `timeout` option
to override the target node's configured timeout for this specific pushed task: