MetaEngine MCP Server

Model Context Protocol server for AI-assisted code generation across 11 languages.

Turn one conversation into 50 consistent files. Claude architects, MetaEngine builds.

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Quick Links

• NPM Package: @metaengine/mcp-server
• Website: metaengine.eu/mcp
• Playground: metaengine.eu/playground

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Installation

Add to ~/.claude/mcp.json (Claude Code) or Claude Desktop config:

{
  "mcpServers": {
    "metaengine": {
      "command": "npx",
      "args": ["-y", "@metaengine/mcp-server"]
    }
  }
}

That's it. No API key, no signup, free to use.

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What Claude Can Generate

• generate_code — classes, interfaces, enums, and generics → ready-to-compile source files
• generate_openapi — typed clients and servers from an OpenAPI spec (10 frameworks)
• generate_graphql — typed clients from GraphQL SDL (10 frameworks)
• generate_protobuf — typed stubs from .proto files (10 frameworks)
• generate_sql — language models from SQL DDL (11 languages)

Claude picks the right tool based on your spec.

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What It Does

MetaEngine is a specialized tool for AI assistants like Claude Code and Claude Desktop. Instead of generating files one by one, you describe what you need in natural language — Claude constructs the spec, and MetaEngine generates all files in one round trip with automatic imports and namespace resolution.

When Claude Uses This Tool

• Generating 20-100 interconnected files where consistency matters
• Multi-language projects (same architecture in TypeScript, Python, Go, C#, Java, Kotlin, Groovy, Scala, Swift, PHP, Rust)
• Pattern multiplication (same structure applied to many entities)
• Complex import management across deep namespaces

When Claude Generates Directly

• 1-15 files — direct generation is faster for small tasks
• Exploratory coding where structure is evolving
• One-off scripts and utilities
• Rapid prototyping where flexibility beats consistency

Both approaches are valid. Claude picks the right tool for the job.

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Supported Languages

• TypeScript
• Python
• Go
• C#
• Java
• Kotlin
• Groovy
• Scala
• Swift
• PHP
• Rust

Each generates idiomatic code (data classes in Kotlin, case classes in Scala, structs in Swift and Rust, etc.)

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Performance

• Single round-trip generation — 25-100 files in one call
• Shorter agent loops vs file-by-file Write — agents that batch through this MCP run with substantially fewer turns and lower cumulative context re-reads.

The tipping point is around 20 files — below that, Claude's direct generation is simpler.

For reproducible measurements across languages, models, and spec shapes, see benchmark/ — a self-contained harness with the prompts, judging tools, and 15 canonical result folders. Numbers there are illustrations from one author's runs at N=5 per cell; reproduce in your own environment to see what holds for you.

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Documentation

The AI guide is automatically embedded in the tool description on first use — no manual reading required. For reference:

• METAENGINE_AI_GUIDE.md — Critical rules, patterns, language notes, and common mistakes
• EXAMPLES.md — Real-world usage with input/output across all languages

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Privacy & Pricing

• Free — no API key, no signup, unlimited requests
• Private — specs sent for generation are never saved or logged (see PRIVACY.md)
• Local — MCP server runs on your machine, MIT licensed
• Terms — See TERMS.md for usage terms

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Support

• Issues: GitHub Issues
• Email: info@metaengine.eu
• Website: metaengine.eu

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License

MIT License - see LICENSE file for details.

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About This Repository

This is the documentation and issue tracking repository for MetaEngine MCP Server. The compiled NPM package is available at @metaengine/mcp-server.

Source code is proprietary, but the MCP server is free to use under MIT license.