A Small App That Ships With AI Agent Skills To Extend And Audit It

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System Design Estimation Practice is an AI Agents & Automation tool that helps users practice back-of-napkin math for estimating and planning large-scale systems. It provides 10 prompts per round and allows users to check their reasoning against reference answers.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Skill level

Technical

About

What is A small app that ships with AI agent skills to extend and audit it?

System Design Estimation Practice is a web-based application designed to help users hone their skills in estimating and planning large-scale systems. It offers a structured practice environment where users can work through 10 prompts per round, quickly estimating values using basic expressions. The tool provides reference answers to allow users to check their reasoning and improve their understanding. Built for customization, it includes bundled AI agent skills to add new prompts or audit the fairness and mathematical accuracy of existing questions using tools like Claude Code or Codex. This makes it a flexible platform for both learning and content development in system design.

Best used for

Ideal for developers and students who need to practice system design estimation, quickly estimate system parameters, and validate their reasoning. Especially valuable for those preparing for technical interviews or looking to improve their quantitative system design skills.

Common actions

practice system design

estimate system parameters

audit AI agent questions

agent governanceagent skills"AI Agents"AutomationAI auditingextensibilityDeveloper Tools

Capabilities

Key features

Practice system design estimation
10 prompts per round
Check reasoning against answers
Add questions with AI agents
Audit questions with AI agents

Target Audience

developerstudent

Integrations

Not yet documented

Pricing & Plans

Open Source

Not Disclosed

FAQs

How many questions are in a practice round?

Each practice round consists of 10 system design estimation prompts. Users are encouraged to estimate quickly and then compare their reasoning against the provided reference answers to improve their skills.

Can I add my own questions to the practice bank?

Yes, the tool is built for customization. You can use the bundled AI agent skills, specifically the '/add-questions' command, to research and add more questions on various topics to the question bank.

How can I ensure the quality and fairness of the questions?

The application includes an '/audit-questions' agent skill. This allows you to have an AI agent check the questions for mathematical accuracy and fairness, with an optional '--fix' flag to automatically correct issues.

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