Nacos 3.1.0 正式发布，支持A2A注册中心与MCP注册协议增强

  ## Feature

  [#12191] Add namespace existence check.
  [#13322] Support A2A registry.
  [#13423] Support enabled or disabled MCP server in console.
  [#13543] Add MCP server import functionality with registry support.
  [#13783] Add config metadata update admin api.
  [#13808] Add Support official mcp registry protocol.
  [#13814] Support prompt encrypt for mcp tools.

  ## Enhancement/Refactor

  [#13777] Enhance namespace exist check logic to improve code quality.
  [#13829] Enhance the hint when publish duplicate name of agent.

  ## BugFix

  [#13744] Fix omitted CONFIG_INFO_GRAY_WRAPPER_ROW_MAPPER for config datasource plugin.
  [#13752] Fix NPE and ignore InterruptedException stack log.
  [#13761] Fix add validation when deleting roles to prevent issues like mistakenly deleting ROLE_ADMIN.
  [#13767] Fix service NullPointerException when K8S getSpec().
  [#13773] Fix preserve protocol slashes when building MCP OpenAPI-derived URLs.
  [#13779] Fix Mcp tool description edit limitation.
  [#13787] Fix bug where the Nacos Mcp console cannot correctly parse OpenApi files.
  [#13801] Fix bug that sometimes garbled characters appear when parsing OpenAPI file URL in MCP console.
  [#13810] Fix bug that caused inconsistent performance between Derby and MySQL databases when publishing configurations.
  [#13824][#13826] Fix AI gRPC resource parser and leak auth login for MCP/A2A request in nacos-client.
  [#13830] Fix agentCard subscribe judgement problem.
  [#13832] Fix blur search may contain unexpected results.

  ## Dependencies

  [#13385] Upgrade os-maven-plugin version to 1.7.1.
  [#13711] Upgrade spring boot version to 3.4.9.
  [#13753] Upgrade grpc version to 1.75.0.
  [#13825] Upgrade jraft version to 1.3.15.bugfix.

<properties>
  <spring.ai.alibaba.version>1.0.0.4</spring.ai.alibaba.version>
</properties>

<dependencies>
  <!-- 引入A2A Server starter -->
  <dependency>
    <groupId>com.alibaba.cloud.ai</groupId>
    <artifactId>spring-ai-alibaba-starter-a2a-server</artifactId>
    <version>${spring.ai.alibaba.version}</version>
  </dependency>
  <!-- 引入A2A Nacos 注册中心 -->
  <dependency>
    <groupId>com.alibaba.cloud.ai</groupId>
    <artifactId>spring-ai-alibaba-starter-a2a-registry</artifactId>
    <version>${spring.ai.alibaba.version}</version>
  </dependency>
  <!-- 引入A2A 百炼大模型客户端，可以用其他的spring ai大模型客户端代替，如openai -->
  <dependency>
    <groupId>com.alibaba.cloud.ai</groupId>
    <artifactId>spring-ai-alibaba-starter-dashscope</artifactId>
    <version>${spring.ai.alibaba.version}</version>
  </dependency>
</dependencies>

server:
  port: 9999

spring:
  application:
    name: a2s-server-example
  ai:
    # 配置百炼大模型
    dashscope:
      api-key: ${BAILIAN_API_KEY}
      base-url: https://dashscope.aliyuncs.com/compatible-mode
      chat:
        options:
          model: qwen-plus-latest
    alibaba:
      a2a:
        # 配置Nacos的地址和用户名密码
        nacos:
          server-addr: ${NACOS_ADDRESS:localhost:8848}
          username: ${NACOS_USERNAME:nacos}
          password: ${NACOS_PASSWORD}
        # 配置A2A server的额外信息，如版本号，agentCard中的Skills等
        server:
          version: 1.0.1
          card:
            url: http://localhost:9999/a2a
            skills:
              - id: nacos-question-answer
                name: Nacos Question Answer
                description: Answer questions about Nacos.
                tags:
                  - Nacos
                examples:
                  - What is Nacos?
            icon-url: https://img.alicdn.com/imgextra/i4/O1CN01rW3vAB1FDWKSOiFf0_!!6000000000453-2-tps-204-40.png
            documentation-url: https://nacos.io
            provider:
              organization: Alibaba
              url: https://www.alibaba.com
logging:
  level:
    root: debug

/**
 * Spring AI Alibaba 启动类
 */
@SpringBootApplication
public class A2aServerExampleApplication {

    public static void main(String[] args) {
        SpringApplication.run(A2aServerExampleApplication.class, args);
    }
}

/**
 * Spring AI Alibaba Agentic API构建LLMAgent
 */
@Configuration
public class RootAgentConfiguration {

    private static final String SYSTEM_PROMPT =
            "An assistant or maintainer for nacos. You only try to answer nacos' question. "
                    + "If user ask not nacos relative question, Please answer with apology. \n When you answer Nacos' question, "
                    + "you can try to use relative tools to query data and do analyze. If no suitable tools found, please answer Nacos' question by your knowledge.\n";

    @Bean
    @Primary
    public BaseAgent rootAgent(ChatModel chatModel) throws GraphStateException {
        return ReactAgent.builder().name("Nacos Agent").description(
                        "Answer question about Nacos and do some maintain and query operation about Nacos Cluster.")
                .model(chatModel).instruction(SYSTEM_PROMPT).outputKey("output").build();
    }
}

<properties>
  <spring.ai.alibaba.version>1.0.0.4</spring.ai.alibaba.version>
  <spring.boot.version>3.4.5</spring.boot.version>
</properties>

<dependencies>
  <!-- 引入A2A Client starter -->
  <dependency>
    <groupId>com.alibaba.cloud.ai</groupId>
    <artifactId>spring-ai-alibaba-starter-a2a-client</artifactId>
    <version>${spring.ai.alibaba.version}</version>
  </dependency>
  <!-- 引入A2A Nacos 注册中心 -->
  <dependency>
    <groupId>com.alibaba.cloud.ai</groupId>
    <artifactId>spring-ai-alibaba-starter-a2a-registry</artifactId>
    <version>${spring.ai.alibaba.version}</version>
  </dependency>
  <!-- 可选，引入web构建简单的页面 -->
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>${spring.boot.version}</version>
  </dependency>
</dependencies>

server:
  port: 8888

spring:
  application:
    name: a2s-client-example
  ai:
    alibaba:
      a2a:
        nacos:
          # 开启从Nacos中自动发现Agent
          discovery:
            enabled: true
          server-addr: ${NACOS_ADDRESS:localhost:8848}
          username: ${NACOS_USERNAME:nacos}
          password: ${NACOS_PASSWORD}
logging:
  level:
    root: debug

/**
 * Spring AI Alibaba 启动类
 */
@SpringBootApplication
public class A2aClientExampleApplication {

    public static void main(String[] args) {
        SpringApplication.run(A2aClientExampleApplication.class, args);
    }
}

/**
 * Spring AI Alibaba Agentic API构建LLMAgent
 */
@Configuration
public class RootAgentConfiguration {

    @Bean
    public BaseAgent rootAgent(AgentCardProvider agentCardProvider) throws GraphStateException {
        return A2aRemoteAgent.builder()
                // 传入自动构建的Nacos AgentCard Provider
                .agentCardProvider(agentCardProvider)
                // 设置需要的Agent的名称，Nacos AgentCard Provider会根据此名称自动订阅AgentCard和Agent的可访问端点
                .name("Nacos Agent")
                .description("Answer Nacos questions or query and operate datum in Nacos.")
                .inputKey("messages")
                .outputKey("messages")
                .build();
    }
}

/**
 * 构建简单的访问API.
 */
@RestController
@RequestMapping("/")
public class TestController {

    private static final Logger LOGGER = org.slf4j.LoggerFactory.getLogger(TestController.class);

    private final BaseAgent rootAgent;

    public TestController(BaseAgent rootAgent) {
        this.rootAgent = rootAgent;
    }

    @GetMapping("sync")
    public Object sync(@RequestParam("question") String question) throws GraphStateException, GraphRunnerException {
        System.out.println(question);
        return rootAgent.invoke(Map.of("messages", List.of(new UserMessage(question)))).orElseThrow().value("messages")
                .orElseThrow();
    }

    @GetMapping("stream")
    public Flux<String> stream(@RequestParam("question") String question) throws GraphStateException, GraphRunnerException {
        return rootAgent.stream(Map.of("messages", List.of(new UserMessage(question)))).mapNotNull(output -> {
            LOGGER.debug("stream agent invoke : `{}`", output.toString());
            if (output.isSTART() || output.isEND()) {
                return null;
            }
            if (output instanceof StreamingOutput) {
                return ((StreamingOutput) output).chunk();
            }
            return null;
        }).publishOn(Schedulers.parallel());
    }
}