Svelte Docs

A Model Context Protocol (MCP) server providing authoritative Svelte 5 and SvelteKit definitions extracted directly from TypeScript declarations. Get precise syntax, parameters, and examples for all Svelte 5 concepts through a single, unified interface.

Architecture

Definition-First Approach: Rather than multiple specialized tools, this server provides one powerful svelte_definition tool that accesses 28+ comprehensive definitions covering:

• All Svelte 5 runes ($state, $derived, $props, $effect variants)
• Modern features (snippets, await expressions, remote functions)
• Event handling (DOM events, custom events, component communication)
• Migration guidance (Svelte 4 to 5 patterns and best practices)
• TypeScript interfaces (Snippet, Snapshot types)
• Advanced patterns (global state, common mistakes, lifecycle equivalents)

Available Tool

svelte_definition

Single, powerful tool for all Svelte 5 and SvelteKit concepts:

svelte_definition(identifier: string, format?: "syntax"|"quick"|"full")

Examples:

• svelte_definition("$state") - Complete $state documentation
• svelte_definition("snippets", "quick") - Snippet overview with example
• svelte_definition("onclick", "syntax") - Just the TypeScript signature
• svelte_definition("migration-patterns") - Svelte 4 → 5 migration guide

Response Formats:

• "syntax" - TypeScript signature only (~50 words)
• "quick" - Definition + minimal example (~200 words)
• "full" - Complete documentation with examples (~500-1000 words, default)

Available Identifiers (28+)

Core Runes: $state, $state.raw, $state.snapshot, $derived, $derived.by, $props, $bindable, $effect, $effect.pre, $effect.root, $effect.pending, $effect.tracking

Development Tools: $inspect, $host

Features & Patterns: snippets, onclick, component-events, migration-patterns, await-expressions, remote-functions, global-state, common-mistakes, lifecycle-equivalents

Event Handling: custom-events, event-delegation, event-modifiers

TypeScript Interfaces: snippet, snapshot

Key Features

🎯 Authoritative & TypeScript-First

• Direct from Source: Definitions extracted from official Svelte 5 TypeScript declarations
• Always Current: Reflects the actual API, not outdated tutorials
• Type-Safe: Includes precise parameter types, return values, and constraints

⚡ Single Interface, Complete Coverage

• One Tool: svelte_definition replaces 16+ specialized tools
• 28+ Definitions: Every Svelte 5 rune, feature, and pattern covered
• Consistent Responses: Same interface whether you need $state or remote-functions

🚀 Modern Svelte 5 & SvelteKit Support

• Await Expressions: Async operations directly in templates (await-expressions)
• Remote Functions: Type-safe client-server communication (remote-functions)
• All Runes: Complete $effect family, $state variants, $derived.by, $bindable
• Advanced Patterns: Event handling, global state, component communication

📚 Smart Error Recovery

• Fuzzy Matching: Suggests correct identifiers for typos
• Related Concepts: Points to similar definitions when searches fail
• Migration Help: Converts Svelte 4 patterns to Svelte 5 equivalents

Config

Claude Desktop (via WSL)

{
	"mcpServers": {
		"mcp-svelte-docs": {
			"command": "wsl.exe",
			"args": ["bash", "-c", "npx -y mcp-svelte-docs"]
		}
	}
}

Cursor

Install MCP Server

Windsurf (via WSL)

{
	"mcpServers": {
		"mcp-svelte-docs": {
			"command": "wsl.exe",
			"args": ["bash", "-c", "npx -y mcp-svelte-docs"]
		}
	}
}

Windows (without WSL)

{
	"mcpServers": {
		"mcp-svelte-docs": {
			"command": "npx",
			"args": ["-y", "mcp-svelte-docs"]
		}
	}
}

macOS / Linux

{
	"mcpServers": {
		"mcp-svelte-docs": {
			"command": "npx",
			"args": ["-y", "mcp-svelte-docs"]
		}
	}
}

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT License - see the LICENSE file for details.

Acknowledgments

Built on:

• Model Context Protocol
• Svelte