Show HN: Tachyon – Java MCP Server SDK

Category: library

Tags: mcp, java, kotlin, netty, virtual-threads, opentelemetry, sdk

Score: 7.0/10 (Innovation: 6, Technical: 8, Documentation: 8, Utility: 6)

Tachyon is a Java 21+ runtime SDK for building Model Context Protocol servers, supporting both blocking Java handlers on virtual threads and a coroutine-first Kotlin DSL. It implements multiple MCP protocol versions with conformance passing, production-grade Netty transport, OpenTelemetry integration, and adapters for existing annotation-based services, filling a real gap for JVM developers adopting MCP.

Target audience: backend Java/Kotlin developers, AI platform engineers, enterprise JVM developers building MCP servers

Repository: https://tachyonmcp.dev · Java · Apache-2.0 · 37 stars

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