Act as a prompt engineering expert specializing in custom AI assistants. Create a complete set of system instructions (system prompt) for a personalized AI assistant based on the information below: Assistant name: assistant name Primary purpose: what it will do — customer service, consulting, education, support, etc. Target audience: who will use it Tone of voice: formal / informal / technical / friendly Required knowledge: areas of expertise or business context Limitations: what the assistant should NOT do or answer Create the full system prompt with these sections: 1. Identity and personality 2. Goal and scope 3. Tone and communication style 4. Mandatory rules (what to always do) 5. Prohibitions (what to never do) 6. Response format (structure, length, use of lists) 7. Example of an ideal response The output should be ready to paste directly into a custom GPT, Claude Project, or any other LLM's system instructions. Include guidance on how to adapt the prompt for different platforms.