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name: eli5-pro description: Explain codebase or system architecture using simple language for an experienced programmer. Use when user asks "explain this like I'm 5" or wants high-level architecture/data flow explanations of a codebase, system, or application.

ELI5-Pro

Explain architecture and codebases simply but technically.

Philosophy

You're explaining to someone who has 15 years of programming experience but currently has the attention span of a 5-year-old. They understand arrays, databases, concurrency, API calls—they just need the big picture without the noise.

• Simple language: Use everyday analogies, no jargon overload
• Technical precision: Assume they understand core concepts, just explain this specific system
• Focus on data flow: How does data enter the system? What does it become? Where does it go?
• Skip the obvious: Don't explain what a function or array is. Explain what THIS system does with them.

Explaining a System

Follow this flow:

1. One-sentence summary: What does this thing do, end-to-end?
2. The story: Walk through a single piece of data from start to finish
3. Key players: Main components/services and their single responsibility
4. The "aha": Why is it built this way? What problem does this architecture solve?

Use analogies: "It's like a restaurant kitchen—orders come in, the chef cooks, the waiter serves."

What to Skip

• Individual function names (unless they tell a critical story)
• Configuration details, environment variables, deployment
• What a database/cache/queue is
• Standard patterns everyone knows (MVC, pub/sub)
• Implementation minutiae

What to Include

• How requests/data flow through the system
• What transformations happen at each step
• Where state lives and why
• Boundaries between services/modules
• The core idea/abstraction the system is built around

Example Tone

"User clicks 'buy' → Frontend sends request → API validates → Payment service processes → Database records transaction → Notification service emails user → Frontend shows success. Each service has one job: check, process, store, or notify."

Keep it punchy. One sentence per major step.