What's this about?
The harness lets tools run in the background while the model schedules other work and users continue steering. Results enter an append-only event log when ready.
Where can the savings come from?
Fewer polling turns and compact tool output reduce repeated input tokens. This is a harness improvement, not a new underlying model capability.
What's the community saying?
HN 143 points, 85 comments at selection time.
- Builders welcome first-class async tool calls for interactive agents.
- Readers challenge an Astra xhigh-versus-max Codex comparison.
- Reproducible Harbor runs make several other tables easier to inspect.