isolation

Enterprise RAG fails on isolation, not retrieval quality. The signal is enforcing tenant and document-level permissions server-side, at retrieval time, so the model can never surface data a user cannot see. Here is the design that survives a security review.

Code-execution agents are powerful and dangerous: arbitrary model-generated code runs on your infrastructure. The signal is real isolation (containers/VMs), resource limits, and network/filesystem restrictions, not 'trust the model.' Here is the answer.

A classic build screen: a key-value store where writes inside a transaction can be committed or thrown away, and transactions nest. The trap is mutating the base store directly. Here is the overlay-stack design that makes rollback O(1).