Run
Model calls, tools, services, routing, and retries live in focused TypeScript nodes.
Product / Runtime contracts
Keep the server run and React UI in sync.
Stream typed output, pause for human input, resume from a checkpoint, and keep session history without writing a second state model for React.
REFUND REVIEW / RUN_81F4LIVE
01
Agent node
check policy
02
Stream
typed decision
03
React
approve refund
The run waits here until a person approves or escalates.
The runtime lifecycle
Run, stream, wait, and resume against the same state.
Stream
Text, validated fields, tool events, and errors reach the interface over one protocol.
Wait
The workflow checkpoints while React renders a choice, form, or custom component.
Revisit
Regenerate, roll back, or fork with transcript and server state kept together.
Typed output and human input
Stream a typed decision, then ask for approval.
Application code can own the question with useInterrupt. When the model should decide what to ask, the schemas can live directly in useReason.
review-refund.node.ts
// review-refund.node.ts
const result = await useReason<RefundDecision, Review, Action>({
id: "refund-review",
model: google("gemini-2.5-flash"),
input: orderAndPolicy,
outputSchema: refundDecisionSchema,
structured: { fields: {
summary: "text-delta",
recommendation: "set",
} },
interrupt: {
schemaId: "refund-approval",
requestSchema, responseSchema,
},
});Kortyx runtime state
Runs, checkpoints, hooks, streams, branches.
State needed to execute, pause, resume, and revisit an agent workflow.
Your product state
Users, orders, permissions, records, interface.
Durable business data stays in the services and database your application already owns.
Write the workflow for your product.
Kortyx carries stream events, checkpoints, and human responses between the workflow and React.