refactor(session): 清理代码 & RunnableConfig 传 sessionId

- AgentLoggingHook 改为从 config.metadata 读取 sessionId（线程安全）
- 移除 AgentLoggingHook 调试用的 metadata 日志
- TokenTrackingChatModel 日志降为 debug
- SessionContextHolder 移除未使用的 setAgentName/getAgentName
- ChatService 清理无用 import
- 修复 stream 路径下 ThreadLocal NPE

src/main/java/com/superbiz/agent/hook/AgentLoggingHook.java

@@ -46,12 +46,20 @@ public class AgentLoggingHook extends MessagesModelHook {
 
     @Override
     public AgentCommand beforeModel(List<Message> previousMessages, RunnableConfig config) {
-        String sessionId = SessionContextHolder.getSessionId();
+        // 优先从 config.metadata 取 sessionId（线程安全），兜底 ThreadLocal
+        String sessionId = config.metadata("sessionId")
+                .map(Object::toString)
+                .orElseGet(SessionContextHolder::getSessionId);
 
-        int stepIndex = stepCounters.merge(sessionId, 0, (old, one) -> old + 1);
+        boolean hasSession = (sessionId != null);
+
+        int stepIndex = 0;
+        if (hasSession) {
+            stepIndex = stepCounters.merge(sessionId, 0, (old, one) -> old + 1);
+        }
 
         log.info("========================================");
-        log.info("*** [Agent 思考] 第 {} 轮思考开始", stepIndex + 1);
+        log.info("*** [Agent 思考] 第 {} 轮思考开始", (hasSession ? stepCounters.get(sessionId) : 0) + 1);
         log.info("*** [Agent 思考] 当前消息数量: {}", previousMessages.size());
 
         // 打印最后几条消息
@@ -101,9 +109,10 @@ public class AgentLoggingHook extends MessagesModelHook {
     @Override
     public AgentCommand afterModel(List<Message> previousMessages, RunnableConfig config) {
         String sessionId = SessionContextHolder.getSessionId();
+        boolean hasSession = (sessionId != null);
 
         log.info("========================================");
-        log.info("*** [Agent 思考] 第 {} 轮思考完成", stepCounters.getOrDefault(sessionId, 0));
+        log.info("*** [Agent 思考] 第 {} 轮思考完成", (hasSession ? stepCounters.getOrDefault(sessionId, 0) : 0));
 
         // 查找最后一条 AssistantMessage（模型的回复）
         AssistantMessage lastAssistant = null;
@@ -117,12 +126,6 @@ public class AgentLoggingHook extends MessagesModelHook {
         boolean hasToolCall = false;
 
         if (lastAssistant != null) {
-            // 调试：打印 metadata
-            if (lastAssistant.getMetadata() != null && !lastAssistant.getMetadata().isEmpty()) {
-                log.info("*** [Agent 思考] 模型返回 metadata: {}", lastAssistant.getMetadata());
-            } else {
-                log.info("*** [Agent 思考] 模型返回 metadata: (空)");
-            }
             // 打印模型返回的文本内容
             String textContent = extractTextContent(lastAssistant);
             if (textContent != null && !textContent.isEmpty()) {

src/main/java/com/superbiz/agent/hook/TokenTrackingChatModel.java

@@ -1,5 +1,7 @@
 package com.superbiz.agent.hook;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.ai.chat.model.ChatModel;
 import org.springframework.ai.chat.model.ChatResponse;
 import org.springframework.ai.chat.prompt.Prompt;
@@ -11,6 +13,8 @@ import reactor.core.publisher.Flux;
  */
 public class TokenTrackingChatModel implements ChatModel {
 
+    private static final Logger log = LoggerFactory.getLogger(TokenTrackingChatModel.class);
+
     private final ChatModel delegate;
 
     public TokenTrackingChatModel(ChatModel delegate) {
@@ -31,15 +35,16 @@ public class TokenTrackingChatModel implements ChatModel {
 
     private void captureTokenUsage(ChatResponse response) {
         try {
-            if (response.getMetadata() != null && response.getMetadata().getUsage() != null) {
-                var usage = response.getMetadata().getUsage();
-                Integer total = usage.getTotalTokens();
-                if (total != null && total > 0) {
-                    TokenUsageHolder.set(total);
-                }
+            if (response.getMetadata() == null || response.getMetadata().getUsage() == null) {
+                return;
+            }
+            var usage = response.getMetadata().getUsage();
+            Integer total = usage.getTotalTokens();
+            if (total != null && total > 0) {
+                TokenUsageHolder.set(total);
             }
         } catch (Exception e) {
-            // 不中断模型调用
+            log.debug("捕获 token 用量失败", e);
         }
     }
 }

src/main/java/com/superbiz/agent/service/ChatService.java

@@ -1,6 +1,7 @@
 package com.superbiz.agent.service;
 
 import com.alibaba.cloud.ai.graph.OverAllState;
+import com.alibaba.cloud.ai.graph.RunnableConfig;
 import com.alibaba.cloud.ai.graph.agent.ReactAgent;
 import com.alibaba.cloud.ai.graph.agent.flow.agent.SupervisorAgent;
 import com.alibaba.cloud.ai.graph.exception.GraphRunnerException;
@@ -254,7 +255,12 @@ public class ChatService {
         SessionContextHolder.setSessionId(sessionId);
 
         try {
-            var response = agent.call(question);
+            // 通过 RunnableConfig 将 sessionId 传入 Hook（线程安全，异步也兼容）
+            var config = RunnableConfig.builder()
+                    .addMetadata("sessionId", sessionId)
+                    .build();
+
+            var response = agent.call(question, config);
             long duration = System.currentTimeMillis() - startTime;
 
             String answer = response.getText();

src/main/java/com/superbiz/agent/util/SessionContextHolder.java

@@ -3,18 +3,17 @@ package com.superbiz.agent.util;
 /**
  * 会话上下文持有者（基于 ThreadLocal）
  * <p>
- * 用于在执行链路中传递 sessionId 和 agentName，覆盖 AgentLoggingHook 和
- * LookupKnowledgeTool 等无法直接通过 RunnableConfig 获取上下文的组件。
+ * 用于在同步调用链路中传递 sessionId，兜底 LookupKnowledgeTool 等
+ * 无法通过 RunnableConfig 获取上下文的组件。
+ * 优先使用 RunnableConfig.metadata 传递，ThreadLocal 作为同步路径的补充。
  * <p>
  * 使用规范：
- * 1. 调用方（ChatService/AiOpsService）在 Agent 执行前调用 setSessionId() 和 setAgentName()
- * 2. AgentLoggingHook 和工具类通过 getSessionId() / getAgentName() 读取
- * 3. 必须在 finally 块中调用 clear()，防止内存泄漏和线程污染
+ * 1. 调用方在 Agent 执行前调用 setSessionId()
+ * 2. finally 块中调用 clear()
  */
 public class SessionContextHolder {
 
     private static final ThreadLocal<String> SESSION_ID = new ThreadLocal<>();
-    private static final ThreadLocal<String> AGENT_NAME = new ThreadLocal<>();
 
     public static void setSessionId(String sessionId) {
         SESSION_ID.set(sessionId);
@@ -24,16 +23,7 @@ public class SessionContextHolder {
         return SESSION_ID.get();
     }
 
-    public static void setAgentName(String agentName) {
-        AGENT_NAME.set(agentName);
-    }
-
-    public static String getAgentName() {
-        return AGENT_NAME.get();
-    }
-
     public static void clear() {
         SESSION_ID.remove();
-        AGENT_NAME.remove();
     }
 }