Svelte Claude Skills

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Svelte Claude Skills

A curated collection of Claude Code skills for Svelte 5 and SvelteKit development. These skills provide context-aware guidance, best practices, and common patterns to help you build Svelte applications more effectively.

What are Claude Code Skills?

Skills are specialized knowledge modules that enhance Claude Code's ability to help with specific frameworks and technologies. When activated, they provide detailed guidance on framework-specific patterns, anti-patterns, migration paths, and best practices.

Available Skills

1. svelte5-runes (90% verified)

Comprehensive guidance for Svelte 5's runes system.

Covers:

$state() - Reactive state with deep reactivity
$derived() - Computed values and lazy evaluation
$effect() - Side effects and lifecycle
$props() / $bindable() - Component props and two-way binding
Svelte 4 → 5 migration patterns
Common mistakes and anti-patterns

Recent updates:

✅ Svelte 5.25+ breaking change documented ($derived mutability)
✅ Deep reactivity patterns verified
✅ All examples tested against official docs

2. sveltekit-data-flow (95% verified)

Master data flow patterns in SvelteKit.

Covers:

Server vs universal load functions (+page.server.ts vs +page.ts)
Form actions with fail(), redirect(), error()
Data serialization rules and limitations
Error and redirect handling patterns
Progressive enhancement

Key learnings:

ALWAYS throw redirect() and error() (not return)
Form actions ONLY in +page.server.ts
Server load data flows to universal load as data parameter

3. sveltekit-structure (92% verified)

Navigate SvelteKit's file-based routing and structure.

Covers:

File naming conventions (+page, +layout, +error, +server)
Nested layouts and layout groups
Error boundaries and placement
SSR and hydration patterns
Dynamic routing and parameters

Key patterns:

{@render children()} in layouts (Svelte 5)
(groups) for organization without URL impact
Error boundaries must be ABOVE failing routes

Installation

Option 1: Clone this repository

# Clone into your Claude skills directory
git clone https://github.com/yourusername/svelte-claude-skills.git ~/.claude/skills/svelte

# Or clone into a specific project
git clone https://github.com/yourusername/svelte-claude-skills.git .claude/skills/

Option 2: Symlink individual skills

# Link specific skills to your global or project Claude skills directory
ln -s /path/to/svelte-claude-skills/.claude/skills/svelte5-runes ~/.claude/skills/
ln -s /path/to/svelte-claude-skills/.claude/skills/sveltekit-data-flow ~/.claude/skills/
ln -s /path/to/svelte-claude-skills/.claude/skills/sveltekit-structure ~/.claude/skills/

Usage

Once installed, Claude Code will automatically detect and activate these skills when working with Svelte/SvelteKit projects. You can also manually invoke them:

# In Claude Code, use the Skill tool
Ask about $bindable props
Help me understand load functions
Show me error handling patterns

The skills use progressive disclosure - starting with quick references and expanding to detailed documentation as needed.

Verification Status

All skills have been verified against official Svelte and SvelteKit documentation:

Skill	Accuracy	Last Verified	Status
svelte5-runes	90%	2025-01-11	✅ Production Ready
sveltekit-data-flow	95%	2025-01-11	✅ Production Ready
sveltekit-structure	92%	2025-01-11	✅ Production Ready

Verification Methodology

Skills are validated using:

Official Svelte documentation (svelte.dev)
Official SvelteKit documentation (kit.svelte.dev)
Community feedback (GitHub issues, Reddit, Stack Overflow)
Real-world testing with current framework versions

Recent Updates

January 11, 2025

CRITICAL: Fixed Svelte 5.25+ breaking change regarding $derived mutability
- $derived values can now be reassigned (but will recalculate on dependency change)
- Updated all documentation to recommend const for truly read-only derived values
Corrected deep reactivity documentation (objects/arrays are deeply reactive by default)
Added version tracking to all skills

What Makes These Skills Accurate?

✅ Verified against official documentation using actual source content
✅ Cross-checked with community discussions and GitHub issues
✅ Tested with current framework versions
✅ Updated for breaking changes (Svelte 5.25+)
✅ Include decision trees and clear anti-patterns
✅ Production-ready examples

Contributing

Found an inaccuracy or have a suggestion?

Check the skill's reference files in .claude/skills/[skill-name]/references/
Verify against official Svelte docs
Open an issue or PR with:
- What the skill currently says
- What the official docs actually say (with links)
- Suggested correction

Skill Development

These skills follow the Claude Code Skills guidelines:

Progressive disclosure (Level 1: description, Level 2: quick start, Level 3: detailed references)
Single-file quick starts (<50 lines)
Detailed references in separate files
TypeScript examples where applicable
Clear anti-patterns with fixes

Project Structure

.claude/skills/
├── svelte5-runes/
│   ├── SKILL.md                    # Quick start
│   └── references/
│       ├── reactivity-patterns.md
│       ├── migration-gotchas.md
│       ├── component-api.md
│       ├── snippets-vs-slots.md
│       └── common-mistakes.md
├── sveltekit-data-flow/
│   ├── SKILL.md
│   └── references/
│       ├── load-functions.md
│       ├── form-actions.md
│       ├── serialization.md
│       └── error-redirect-handling.md
└── sveltekit-structure/
    ├── SKILL.md
    └── references/
        ├── file-naming.md
        ├── layout-patterns.md
        ├── error-handling.md
        └── ssr-hydration.md

Resources

License

MIT

Acknowledgments

Built with verification methodology inspired by the research skill pattern - always verify against actual source content, never trust summaries without checking sources.

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