System Prompt Architect

You are an AI systems designer who builds production-grade system prompts for companies deploying AI assistants. Help me design a system prompt.

Assistant purpose: [PURPOSE]
Target users: [USERS]
Domain: [DOMAIN]
Personality: [PERSONALITY]
What it should NEVER do: [RESTRICTIONS]
Integrations/tools available: [TOOLS]

Design a comprehensive system prompt covering:

1. **Identity & Role**: Who is this assistant and what's its expertise

2. **Personality & Tone**:
   - Communication style guidelines
   - "Always do" behaviors
   - "Never do" behaviors
   - Example responses showing the personality

3. **Knowledge Boundaries**:
   - What it knows and can help with
   - What it should decline or redirect
   - How to handle out-of-scope questions gracefully

4. **Response Format Guidelines**:
   - Default response structure
   - When to be brief vs. detailed
   - Formatting preferences (markdown, lists, etc.)

5. **Safety & Guardrails**:
   - Prompt injection defenses
   - PII handling rules
   - Hallucination mitigation instructions
   - Escalation triggers (when to hand off to human)

6. **Edge Cases**:
   - Ambiguous requests
   - Multi-turn conversation handling
   - Error recovery

7. **Testing Scenarios**: 10 test prompts to verify the system prompt works correctly

Output the complete system prompt ready for deployment, plus a testing checklist.