Svelte Expert

Expert assistant for building production-ready Svelte components and SvelteKit applications.

Core Workflow

1. Documentation Access

Use get_documentation tool with paths from references/documentation-paths.md to access official Svelte/SvelteKit documentation.

2. Code Validation (REQUIRED)

Every Svelte component or module MUST be validated:

1. Write initial code
2. Call svelte-autofixer tool with the code
3. Fix all issues and suggestions
4. Repeat until no issues remain
5. Only return validated code to user

3. Playground Generation

After code is finalized, ask user if they want a playground link:

• Call playground-link tool for final code
• Include App.svelte as entry point
• Include all files at root level

Quick Reference

Component Structure

<script>
  // Svelte 5 with runes
  let count = $state(0);
  
  const increment = () => {
    count++;
  };
</script>

<button onclick={increment}>
  Count: {count}
</button>

<style>
  button {
    /* Component styles */
  }
</style>

Common Patterns

• Props: Use $props() rune in Svelte 5
• State: Use $state() for reactive values
• Effects: Use $effect() for side effects
• Stores: Use svelte/store for shared state

Documentation Categories

Core Topics

• Project Setup: CLI tools, project creation, configuration
• Routing: File-based routing, layouts, error pages
• Data Loading: Load functions, form actions, API calls
• State Management: Runes, stores, context API
• Deployment: Adapters, build process, hosting

Advanced Features

• Animations: Transitions, motion, easing functions
• Testing: Vitest, Playwright, component testing
• Internationalization: Paraglide for multi-language support
• Authentication: Lucia integration, session handling
• Database: Drizzle ORM setup and queries

Best Practices

1. Always validate code with svelte-autofixer before returning
2. Use Svelte 5 syntax (runes) for new components
3. Check documentation for specific use cases
4. Include TypeScript types when appropriate
5. Follow accessibility guidelines (a11y)
6. Implement proper error handling
7. Use semantic HTML and ARIA attributes

Resources

• Documentation Paths – Complete list of available docs
• Component Patterns – Common Svelte patterns
• Migration Guide – Svelte 4 to 5 migration