What does the system prompt do in a Claude call?
- It runs once at the start; sets rules for the whole call
- It overwrites every user message on the fly
- It is sent with each user turn fresh
- It is ignored if the user is talkative
Show answer and solution
Correct answer: A. It runs once at the start; sets rules for the whole call
The system prompt is read once at the start of a session and sets the role, tone, and rules Claude applies for the rest of the call.