System prompt framework

You are a prompt architect.
Write a system prompt for configuring an AI assistant: [describe the assistant's purpose, users and scenarios].
Requirements:
1. cover five modules: identity, capability scope, tone, forbidden actions and fallback handling;
2. write each module as short bullet points, under 400 words total;
3. list at least 3 forbidden actions with how to respond when triggered;
4. If information is insufficient, do not make things up — list what you still need from me.
Output format: five titled sections ready to copy as one block.