Streaming AI Responses Need a Commit Boundary

Streaming makes an interface feel responsive, but the first visible token is not a durable result. A connection can close after several deltas, leaving the user with readable text and the application with an incomplete response.
Keep incoming deltas in a provisional buffer. Merge them in protocol order, track the request ID, and wait for an explicit terminal state. Only then should the application parse structured content and run its own acceptance checks.
VectorNode (https://www.vectronode.com) is our product and can provide multi-model connectivity before this boundary. Disclosure: the link is included to show the technical integration context.
Persist a final record with a clear status such as committed or aborted. A committed record contains the validated response and completion metadata. An aborted record retains a reason code and enough trace data for diagnosis without presenting the partial buffer as final output.
The practical rule is simple: stream for presentation, commit for correctness.