A2A

<dependency>
    <groupId>io.agentscope</groupId>
    <artifactId>agentscope-extensions-a2a-client</artifactId>
    <version>${agentscope.version}</version>
</dependency>

import io.a2a.spec.AgentCard;
import io.agentscope.core.a2a.agent.A2aAgent;

AgentCard card = AgentCard.builder()
    .name("remote-translator")
    .url("http://other-service:8080")
    // ...
    .build();

A2aAgent remote = A2aAgent.builder()
    .name("remote-translator")
    .agentCard(card)
    .build();

Msg result = remote.call(new UserMessage("Translate to English: 你好")).block();

import io.agentscope.core.a2a.agent.card.WellKnownAgentCardResolver;

WellKnownAgentCardResolver resolver = new WellKnownAgentCardResolver(
    "http://127.0.0.1:8080",
    "/.well-known/agent-card.json",
    Map.of()
);

A2aAgent remote = A2aAgent.builder()
    .name("remote")
    .agentCardResolver(resolver)
    .build();

<dependency>
    <groupId>io.agentscope</groupId>
    <artifactId>agentscope-extensions-a2a-server</artifactId>
    <version>${agentscope.version}</version>
</dependency>

import io.agentscope.core.a2a.server.AgentScopeA2aServer;
import io.agentscope.core.a2a.server.transport.jsonrpc.JsonRpcTransportProperties;

ReActAgent.Builder agentBuilder = ReActAgent.builder()
    .name("backend-agent")
    .model(model);

AgentScopeA2aServer server = AgentScopeA2aServer.builder()
    .agentBuilder(agentBuilder)
    .transportProperties(new JsonRpcTransportProperties())
    // .agentCard(customCard)
    // .agentRegistry(myRegistry)
    .build();

// Delegate inbound requests to the transport wrapper from your web framework
TransportWrapper wrapper = server.getTransportWrapper("JSONRPC");
// ... Spring/Quarkus controller forwards to wrapper.handle(...)

server.postEndpointReady();   // call after the web server is listening — triggers registration etc.