specification:
  functional_requirements:
    - id: "FR-001"
      description: "System shall authenticate users via OAuth2"
      priority: "high"
      acceptance_criteria:
        - "Users can login with Google/GitHub"
        - "Session persists for 24 hours"
        - "Refresh tokens auto-renew"

*See sub-skills for full details.*

## Constraint Analysis


```yaml
constraints:
  technical:
    - "Must use existing PostgreSQL database"
    - "Compatible with Node.js 18+"
    - "Deploy to AWS infrastructure"

  business:
    - "Launch by Q2 2024"
    - "Budget: $50,000"

*See sub-skills for full details.*

## Use Case Definition


```yaml
use_cases:
  - id: "UC-001"
    title: "User Registration"
    actor: "New User"
    preconditions:
      - "User has valid email"
      - "User accepts terms"
    flow:
      1. "User clicks 'Sign Up'"

*See sub-skills for full details.*

## Acceptance Criteria (Gherkin)


```gherkin
Feature: User Authentication

  Scenario: Successful login
    Given I am on the login page
    And I have a valid account
    When I enter correct credentials
    And I click "Login"
    Then I should be redirected to dashboard
    And I should see my username

*See sub-skills for full details.*