Building agents that can spend money (via AP2/payment APIs). Regulators want audit trails. Agents use tools from multiple vendors.

Problem: No unified way to prove why an agent made a decision. Each vendor logs their piece, but the full decision chain is fragmented.

Anyone solved this? Especially interested in: - Cross-vendor decision provenance - What to log (CoT? Context? Just actions?) - Storage (centralized DB vs. immutable ledger)