Writing system prompts is weirdly hard — would anyone play a game that turns it into a skill challenge?

I've been building a ive AI grandmother - a bot that's always available to listen about your day and help you track your goals. Sounds simple, right? Turns out making a model actually follow rules is brutal. Getting it to always reply with text (not markdown, not bullet points - just warm conversational text), keeping responses short enough to feel like a real chat, making it use tools correctly without breaking character - each of these took me way iterations than I expected. And it hit me: this is a real skill.