Act as a prompt engineer specializing in creating system prompts for AI assistants (ChatGPT Custom GPTs, Claude Projects, etc). Create a complete, optimized system prompt for my use case. Assistant function: what the assistant should do - e.g., answer customer questions about my SaaS Tone of voice: formal / casual / technical / friendly / professional Target users: who will interact with the assistant Required knowledge: domain expertise - e.g., sports nutrition, employment law Restrictions: what the assistant must NOT do - e.g., no medical diagnoses Build the system prompt following these best practices: 1. **Identity and role**: clearly define who the assistant is, its specialty and experience level 2. **Primary objective**: what is the assistant's core mission in every conversation 3. **Tone and communication style**: how it should communicate, with example phrases 4. **Behavioral rules**: - What to ALWAYS do (e.g., cite sources, ask for confirmation) - What to NEVER do (e.g., fabricate data, go off-scope) - How to handle out-of-scope questions 5. **Response structure**: default format for answers (lists, short paragraphs, emoji usage, etc) 6. **Knowledge base**: essential information the assistant should have as permanent context 7. **Conversation flows**: how to start, deepen, and close interactions 8. **Error handling**: what to do when it doesn't know the answer Deliver the final system prompt in a code block ready to copy and paste, with comments explaining each section.