slug: add-input-validation
title: "Add input validation to create_user()"
description: |
  The create_user(name, email, age) function in app.py performs no input validation.
  Add validation that raises ValueError for: empty or whitespace-only name,
  email without '@', age < 0, age > 150. All validation tests must pass.
repo:
  url: file:///tmp/arena-tasks/arena-task-validation
  ref: main
success:
  command: "python -m pytest tests/ -v"
limits:
  time_seconds: 300
  max_tokens: 200000
difficulty: easy