Cost drivers to watch
- Model choice — Opus is 5× everything.
- web_search — highest single tool cost. Capped where Xura controls it.
- max_tokens — output cap. Xura sets reasonable defaults (2500 for flows/signals).
- Data row count — big query results = big context = expensive next turn.
- Continuations — pause_turn loops that go deep. Xura caps at 1 for cost paths.
