The Spirit of Construction Arbitration?

The NEC form of construction contract famously requires the parties to act in a spirit of mutual trust and cooperation.

What's the equivalent principle when it comes to international arbitration rules?

Most arbitral rules side-step this question, requiring the institution and the tribunal to 'act in the spirit of the rules', to be quick about their work, and to do their best to deliver an enforceable award (see e.g., r 42 of the ICC Rules 2021 or r 42 of the SIAC Rules 2016).

No mention of the Parties or their representatives at all in those provisions. No guidance for them on how to behave from the rules. And no one knows what 'the spirit of the rules' means in the first place.

The arbitration community would be better served by rules that actually set out the spirit in which the parties should behave.

An approach of mutual trust with the tribunal/institution and cooperation with all parties in the dispute resolution process would be a great starting point.