kpavlov/tachyon

Tachyon MCP — A Java 21 Model Context Protocol (MCP) server built on Netty 4.2. Fully implements MCP spec 2025-11-25 Streamable HTTP transport, session lifecycle, native I/O transports, and a stateless mode for serverless deployments.

TL;DR

import dev.tachyonmcp.server.TachyonMcpServer;
import dev.tachyonmcp.server.features.tools.AbstractSyncToolHandler;
import dev.tachyonmcp.server.features.tools.ToolDescriptor;
import dev.tachyonmcp.server.features.tools.ToolResult;
import dev.tachyonmcp.server.session.McpContext;
import tools.jackson.databind.node.JsonNodeFactory;

void main() {
    var schema = JsonNodeFactory.instance.objectNode();
    schema.put("type", "object");
    schema.putObject("properties").putObject("city").put("type", "string");

    TachyonMcpServer.builder()
        .name("weather-mcp")
        .tool(new AbstractSyncToolHandler(
            ToolDescriptor.builder("get_forecast")
                .description("Get weather forecast")
                .inputSchema(schema)
                .build()) {
            @Override
            public Object handle(McpContext ctx, Object args) {
                return ToolResult.text("☀️ 22°C");
            }
        })
        .stateless(true)
        .port(8080)
        .bind();
}
`