Multi-Agent Systems on AWS Lambda with Durable Functions

In my previous post on multi-agent systems , I built a purchasing coordinator where a coordinator agent routes requests to specialist agents based on RISEN prompt contracts. RISEN structures system prompts into five components: Role, Instructions, Steps, Expectation, and Narrowing. In a multi-agent system, the Steps section encodes the routing logic and the Narrowing section prevents agents from doing each other's work. A laptop triggers Price Research and Delivery. A used car triggers all five specialists. The routing logic lives in the prompts, not in code. It works, but it runs in a single process. No fault isolation, no independent scaling, no durability. If the process crashes halfway through specialist consultations, you start over. The durable functions post solved the durability problem for a support ticket triage workflow: checkpoint each step, suspend for human review, resume where you left off. But that was a single-agent workflow. This post combines the two. The same purcha