System Design

What it does

This skill enables AI agents to design scalable and resilient system architectures following a structured framework. It guides users through a four-step process – scope definition, high-level design, deep dive into critical components, and wrap-up—to ensure systems are appropriately engineered for their intended purpose and scale. The skill emphasizes understanding requirements before proposing solutions and considers trade-offs when selecting architectural building blocks like load balancers, caches, and databases.

When to use it

• When architecting new services or features.
• During system design reviews to assess adherence to best practices.
• To estimate capacity needs for a given application.
• As preparation for system design discussions with technical teams.

Key capabilities

• Four-Step Design Process: Guides users through scoping, high-level design, deep dive, and wrap-up phases.
• Requirements Focus: Prioritizes understanding requirements (functional and non-functional) before architectural decisions.
• Building Block Selection: Provides guidance on choosing appropriate components for distributed systems.
• Tradeoff Analysis: Identifies and acknowledges trade-offs inherent in design choices.
• Scoring System: Evaluates system designs using a 0-10 scoring system based on adherence to principles, providing feedback for improvement.

Example prompts

• "Design a system for handling 1 million daily active users."
• "Review this existing system architecture and rate it (0-10) with specific improvements needed."
• "Walk me through the four steps of designing a microservice for processing image uploads."

Tips & gotchas

• Prioritize Step 1: Never skip the initial scoping phase, as ambiguity in requirements can lead to wasted design effort.
• Explicit Assumptions: Ensure explicit agreement on assumptions before proceeding with any design work.
• Time Allocation: The framework suggests allocating time proportionally across each step (5-10 mins for scope, 15-20 mins for high-level design, etc.).