When should you use a hierarchical (cyclical graph) architecture instead of a single-loop agent?

A single-loop agent works well for tasks that are relatively linear and don't need much structural control over what happens next.

• Use a graph-based, hierarchical architecture when a workflow has clear branching logic, like different paths for success versus failure
• Useful when specific steps need mandatory checkpoints, such as a human approval node before an irreversible action
• Better suited to enterprise workflows where auditability and predictable execution paths matter more than maximum flexibility

The trade-off is flexibility, a single-loop agent can improvise more freely, while a graph-based structure trades some of that freedom for a workflow whose possible paths are fully known in advance.

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