Core ACP implementation with stdio transport; needs one JSON module (acp-json-jackson2 or acp-json-jackson3) at runtime

Execution ledger — Experiment/Run tracking for agent workflows

Test utilities for ACP SDK - InMemoryTransportPair, MockAcpAgent, MockAcpClient

Reflection-based runtime for annotation-driven ACP agents

ACP JSON mapper implementation based on Jackson 2 (com.fasterxml.jackson.databind)

Spring Siyukio Tools

The framework-neutral ACP Streamable HTTP and WebSocket endpoint: routing, sessions, SSE mailboxes, the status and close-code table, the Origin check and shutdown, behind the host contract every server adapter implements

The SDK's own ACP listener: an embedded Jetty 12.1 server running the acp-http-servlet host, with Jetty's Jakarta WebSocket implementation, for agents served from a plain Java program

Framework-neutral building blocks for ACP framework integrations: settings, transports, agent discovery and assembly, and host lifecycles

ACP JSON mapper implementation based on Jackson 3 (tools.jackson.databind)

WebSocket agent transport using Jetty - for agents that accept WebSocket connections