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Although the system prompt is the core of the agent and plays a crucial role in shaping its behavior, it cannot control every aspect of the system. Below are a few examples of areas that cannot be influenced solely through the prompt.

Examples

ItemDescription
Voice (speed, volume, pitch)Determined by the TTS provider (Cartesia/ElevenLabs), not by the prompt
Timing / PausesThe agent has no sense of time; “wait 2 seconds” is ignored
First MessageSet in the “First Message” field in the agent settings, not in the system prompt
Silence HandlingThe idle handler is system behavior; the prompt can only trigger waitForUserToReturn as a tool call
Call OutcomesExtracted from the transcript after the call, not set by the agent during the call
Tool CallsThe prompt defines when a tool is called; the system automatically provides the current parameter definition to the agent