Marry the power of AI with the simplicity of http4k

Build secure MCP-compliant servers to integrate Large Language Models with your data and tools using familiar http4k patterns

✦ Read the Launch Announcement ✦

Highlights

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Simple
Integration

Build secure MCP-compliant servers using familiar http4k patterns. Seamlessly connect AI models with your existing systems and data sources.

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Type-safe
Tooling

Create robust AI integrations using http4k’s powerful Lens system for type-safe tool definitions and capability bindings with compile-time safety.

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Flexible
Transport

Support for both stateful and stateless HTTP Streaming protocols, SSE, Websocket and Standard IO transports, enabling seamless integration with desktop and web-based AI applications.

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Complete
Capabilities

Full support for Official and Draft MCP capabilities including structured Tools Output, Protected Resource OAuth and Elicitations, with both local and cloud-based model support.

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Testable
Design

Build highly testable MCP services with pure functions and no side effects. Create predictable, testable, and composable AI capabilities that can be verified without running a server.

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Serverless
Ready

Deploy your MCP capabilities to AWS Lambda, GCP Functions, and other FaaS platforms using http4k’s serverless adapters with zero code changes.

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Protocol
Client

Build your own AI agents with our pure Kotlin MCP protocol clients. Integrate MCP capabilities directly into your applications for custom agent development and advanced AI workflows.

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Desktop
Integration

Connect any MCP server to Claude and other AI assistants using the http4k-mcp-desktop client, with support for all transport modes and authentication types.

Getting started with MCP in http4k

Step 1 - Define typesafe MCP tools and capabilities using simple, testable functions

Defining MCP tools

Step 2 - Create your MCP server by composing capabilities and security into a lightweight server

Creating an MCP server

Step 3 - Integrate your AI-powered app with Claude Desktop as a server or native binary

Using Claude with an MCP server

Step 4 - Access your MCP server from other agents using our pure Kotlin MCP Client

Inter-agent communication

License

http4k MCP (Model Context Protocol) is available under the http4k Commercial License. Free usage is granted for qualifying small businesses (<$1m ARR), non-commercial, non-profit, and research activities.

Pricing*


*All http4k Pro modules are also automatically included as a part of the http4k Enterprise Edition subscription. Please see here for details.