Every voice-agent team eventually hits the same wall: a single system prompt that started clean becomes an unmaintainable pile of edge-case instructions.
Graph agents let you express the deterministic parts of a call, verification, routing, compliance disclosures, as explicit nodes, while leaving the LLM free to handle open-ended conversation where it actually adds value.
The result is agents that are easier to debug, easier to test, and much less likely to wander off-script on a live call.