Nexus hardens agents with escrow, tests

The interesting part here is not that Nexus adds more agent features, but that it treats failure modes as protocol bugs to be eliminated, not edge cases to be hand-waved. That makes it feel closer to durable distributed systems design than typical “agent orchestration” marketing.

• –The explicit state machine and terminal-state locking are the right answer to duplicate requests, late callbacks, and replay-driven double effects.
• –Escrow as the only settlement path is a strong control point, because it prevents code paths from bypassing accounting under partial failure.
• –Re-checking eligibility at routing and dispatch is a practical hedge against drift, since agent health can change between decision and execution.
• –The append-only trust ledger is a good anti-magic move: every score change is attributable, which makes debugging and dispute handling much easier.
• –The adversarial test suite matters as much as the design itself; if these invariants keep passing under duplicate, race, and reconciliation scenarios, the project has real credibility.