A single-prompt agent uses one instruction set throughout the conversation. It works well when the caller can move between topics and the agent should decide the next response from context.
Write the instructions
Open a single-prompt agent and edit Instructions. A useful prompt separates the agent’s role, goal, information, conversation rules, and fallback behavior.
Choose whether the AI or the caller starts the conversation. For an AI-first call, configure a static greeting or instructions for a generated greeting. You can also control the pause before the greeting and whether the caller may interrupt it.
Use dynamic variables in the greeting or instructions when the value changes per call. Define a default value so previews and calls still behave predictably when a value is missing.
Connect data and actions
- Attach a knowledge base for information that is too large or changes too often to place in the prompt.
- Add actions when the agent needs to end or transfer a call, call an API, capture keypad input, extract values, or use a calendar.
- Configure post-call extraction when you need structured results after the conversation.
Test the boundaries
Test the intended path and at least these failure paths:
- The caller asks for information that is not available.
- A required dynamic variable is missing.
- A tool returns an error or times out.
- The caller interrupts or stays silent.
- The caller gives an ambiguous date, phone number, or identifier.
Change one prompt section at a time, repeat the same test, and compare the result before publishing.
