在 Spring AI 中自定义 Tool 调用返回值——实现 TodoList 提醒注入

谷江雪 · 昨天 14:20

最近发现了一个极简 Claude Code 的文档：https://learn.shareai.run/en/s03/
其中有一个实用技巧：如何在适当时机提醒 AI 更新 TodoList？ 文档中的做法是：当连续三次工具调用都没有触发 todo 更新操作时，在 Function Call 返回值的第一个位置插入一条提醒：

<reminder>Update your todos.</reminder>

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对应的 Python 实现如下：

if rounds_since_todo >= 3 and messages: last = messages[-1] if last["role"] == "user" and isinstance(last.get("content"), list): last["content"].insert(0, { "type": "text", "text": "<reminder>Update your todos.</reminder>", })

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那么在 Spring AI 中能否实现同样的效果？经过一番研究，答案是可以的。本文记录实现过程。
代码仓库

项目完整 LangChain4j 代码实现：https://www.codefather.cn/course/1948291549923344386
完整的代码地址：https://github.com/lieeew/leikooo-code-mother
依赖版本

对应的 SpringAI 版本和 SpringBoot 依赖：

<properties>
<java.version>21</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>4.0.1</spring-boot.version>
<spring-ai.version>2.0.0-M2</spring-ai.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.ai</groupId>
spring-ai-starter-model-minimax</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.ai</groupId>
spring-ai-bom</artifactId>
<version>${spring-ai.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>

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定义 TodoList Tool

首先需要定义供 LLM 调用的 Tool。以下是完整实现，包含读取和写入两个操作，并通过 Caffeine 本地缓存按会话隔离存储：

/**
* @author leikooo
* @date 2025/12/31
*/
@Component
public class TodolistTools extends BaseTools {
private static final int MAX_TODOS = 20;
private static final Set<String> VALID_STATUSES = Set.of("pending", "in_progress", "completed");
private static final Map<String, String> STATUS_MARKERS = Map.of(
"pending", "[ ]",
"in_progress", "[>]",
"completed", "[x]"
);
private record TodoItem(String id, String text, String status) {}
private static final Cache<String, List<TodoItem>> TODOLIST_CACHE = Caffeine.newBuilder()
.maximumSize(1000)
.expireAfterWrite(Duration.ofMinutes(30))
.build();
@Tool(description = "Update task list. Track progress on multi-step tasks. Pass the full list of items each time (replaces previous list). " +
"Each item must have id, text, status. Status: pending, in_progress, completed. Only one item can be in_progress."
)
public String todoUpdate(
@ToolParam(description = "Full list of todo items. Each item: id (string), text (string), status (pending|in_progress|completed).")
List<Map<String, Object>> items,
ToolContext toolContext
) {
try {
String conversationId = ConversationUtils.getToolsContext(toolContext).appId();
if (items == null || items.isEmpty()) {
TODOLIST_CACHE.invalidate(conversationId);
return "No todos.";
}
if (items.size() > MAX_TODOS) {
return "Error: Max " + MAX_TODOS + " todos allowed";
}
List<TodoItem> validated = validateAndConvert(items);
TODOLIST_CACHE.put(conversationId, validated);
return render(validated);
} catch (IllegalArgumentException e) {
return "Error: " + e.getMessage();
}
}
private List<TodoItem> validateAndConvert(List<Map<String, Object>> items) {
int inProgressCount = 0;
List<TodoItem> result = new ArrayList<>(items.size());
for (int i = 0; i < items.size(); i++) {
Map<String, Object> item = items.get(i);
String id = String.valueOf(item.getOrDefault("id", String.valueOf(i + 1))).trim();
String text = String.valueOf(item.getOrDefault("text", "")).trim();
String status = String.valueOf(item.getOrDefault("status", "pending")).toLowerCase();
if (StringUtils.isBlank(text)) {
throw new IllegalArgumentException("Item " + id + ": text required");
}
if (!VALID_STATUSES.contains(status)) {
throw new IllegalArgumentException("Item " + id + ": invalid status '" + status + "'");
}
if ("in_progress".equals(status)) {
inProgressCount++;
}
result.add(new TodoItem(id, text, status));
}
if (inProgressCount > 1) {
throw new IllegalArgumentException("Only one task can be in_progress at a time");
}
return result;
}
@Tool(description = "Read the current todo list for this conversation. Use this to check progress and see what tasks remain.")
public String todoRead(ToolContext toolContext) {
String conversationId = ConversationUtils.getToolsContext(toolContext).appId();
List<TodoItem> items = TODOLIST_CACHE.getIfPresent(conversationId);
return items == null || items.isEmpty() ? "No todos." : render(items);
}
private String render(List<TodoItem> items) {
if (items == null || items.isEmpty()) {
return "No todos.";
}
StringBuilder sb = new StringBuilder("\n\n");
for (TodoItem item : items) {
String marker = STATUS_MARKERS.getOrDefault(item.status(), "[ ]");
sb.append(marker).append(" #").append(item.id()).append(": ").append(item.text()).append("\n\n");
}
long done = items.stream().filter(t -> "completed".equals(t.status())).count();
sb.append("\n(").append(done).append("/").append(items.size()).append(" completed)");
return sb.append("\n\n").toString();
}
@Override
String getToolName() { return "Todo List Tool"; }
@Override
String getToolDes() { return "Read and write task todo lists to track progress"; }
}

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问题分析：为什么不能在普通 Advisor 中拦截工具调用？

通过阅读源码 org.springframework.ai.minimax.MiniMaxChatModel#stream 可以发现，框架内部会在 ChatModel 层直接执行 Tool 调用，而不是将其透传给 Advisor 链。核心执行逻辑如下：

// Tool 调用的核心逻辑，如下：
Flux<ChatResponse> flux = chatResponse.flatMap(response -> {
if (this.toolExecutionEligibilityPredicate.isToolExecutionRequired(requestPrompt.getOptions(), response)) {
// FIXME: bounded elastic needs to be used since tool calling
// is currently only synchronous
return Flux.deferContextual(ctx -> {
ToolExecutionResult toolExecutionResult;
try {
ToolCallReactiveContextHolder.setContext(ctx);
toolExecutionResult = this.toolCallingManager.executeToolCalls(prompt, response);
}
finally {
ToolCallReactiveContextHolder.clearContext();
}
return Flux.just(ChatResponse.builder().from(response)
.generations(ToolExecutionResult.buildGenerations(toolExecutionResult))
.build());
}).subscribeOn(Schedulers.boundedElastic());
}
return Flux.just(response);
})
.doOnError(observation::error)
.doFinally(signalType -> observation.stop())
.contextWrite(ctx -> ctx.put(ObservationThreadLocalAccessor.KEY, observation));

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这意味着，如果我们在外层 Advisor 中尝试拦截 tool_call，此时工具已经执行完毕，并且无法识别到工具调用。所以我准备使用我自己写的 MiniMaxChatModel 覆盖掉这个源码的逻辑，之后再 Advisor 接管这个 Tool 执行。
验证思路：能否通过 Advisor 接管工具执行？

我们需要在自己的项目目录创建一个 org.springframework.ai.minimax.MiniMaxChatModel 具体文件内容可以访问 https://www.codecopy.cn/post/7lonmm 获取完整的代码。详细代码位置如下图所示：

这样写好之后就可以让工具调用信号透传到 Advisor 层，判断是否有 Tool 调用。验证用的 Advisor 如下：

@Slf4j
public class FindToolAdvisor implements StreamAdvisor {
@Override
public Flux<ChatClientResponse> adviseStream(ChatClientRequest chatClientRequest, StreamAdvisorChain streamAdvisorChain) {
return Flux.deferContextual(contextView -> {
log.info("Advising stream");
return streamAdvisorChain.nextStream(chatClientRequest).doOnNext(streamResponse -> {
boolean hasToolCalls = streamResponse.chatResponse().hasToolCalls();
log.info("Found tool calls: {}", hasToolCalls);
});
});
}
@Override
public String getName() { return "FindToolAdvisor"; }
@Override
public int getOrder() { return 0; }
}

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@Component
public class StreamApplication implements CommandLineRunner {
@Resource
private ChatModel chatModel;
@Override
public void run(String... args) throws Exception {
ChatClient chatClient = ChatClient.builder(chatModel)
.defaultTools(FileSystemTools.builder().build())
.defaultAdvisors(new FindToolAdvisor())
.build();
ChatClient.StreamResponseSpec stream = chatClient.prompt("""
帮我写一个简单的 HTML 页面，路径是 E:\\TEMPLATE\\spring-skills 不超过 300 行代码
""").stream();
stream.content().subscribe(System.out::println);
}
}

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配置文件：

spring:
ai:
minimax:
api-key: sk-cp-xxxxx
chat:
options:
model: MiniMax-M2.5

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测试结果证明工具调用信号可以被成功拦截，方案可行：

改造项目：实现 ExecuteToolAdvisor

参考 Spring AI 社区中一个尚未合并的 PR（#5383），我们实现了 ExecuteToolAdvisor，主要做了两件事：

工具调用 JSON 格式容错：捕获 JSON 解析异常，最多重试 3 次再抛出，提升大模型调用 Tool 时格式不规范的容错能力。
TodoList 提醒注入：连续 3 次工具调用均未触发 todoUpdate 时，在 ToolResponseMessage 的第一个位置注入提醒，引导 AI 及时更新任务列表。

⚠️ 注意 order 顺序：由于该 Advisor 接管了工具执行，它的 order 值应尽量大（即靠后执行）。若 order 较小，可能导致后续 Advisor 的 doFinally 在每次工具调用时都被触发（比如后面的 buildAdvisor、versionAdvisor 只需要执行一次），而非在整个对话结束时触发一次。本实现中使用 Integer.MAX_VALUE - 100。

/** * 手动执行 tool 的 StreamAdvisor：关闭框架内部执行，自行执行并可在工具返回值中注入提醒（如更新 todo）。 * * @author leikooo * @date 2026/3/14 */@Slf4j@Componentpublic class ExecuteToolAdvisor implements StreamAdvisor { private static final String TODO_REMINDER = "<reminder>Update your todos.</reminder>"; private static final String JSON_ERROR_MESSAGE = "Tool call JSON parse failed. Fix and retry.\n" + "Rules: strict RFC8259 JSON, no trailing commas, no comments, " + "no unescaped control chars in strings (escape newlines as \\n, tabs as \\t), " + "all keys double-quoted."; private static final int MAX_TOOL_RETRY = 3; private static final int ORDER = Integer.MAX_VALUE - 100; private static final String TODO_METHOD = "todoUpdate"; private static final int REMINDER_THRESHOLD = 3; /** * 三次工具没有使用 todoTool 那么就在 tool_result[0] 位置添加 TODO_REMINDER */ private final Cache roundsSinceTodo = Caffeine.newBuilder() .maximumSize(10_00) .expireAfterWrite(Duration.ofMinutes(30)) .build(); @Resource private ToolCallingManager toolCallingManager; @Override public Flux adviseStream(ChatClientRequest chatClientRequest, StreamAdvisorChain streamAdvisorChain) { Assert.notNull(streamAdvisorChain, "streamAdvisorChain must not be null"); Assert.notNull(chatClientRequest, "chatClientRequest must not be null"); if (chatClientRequest.prompt().getOptions() == null || !(chatClientRequest.prompt().getOptions() instanceof ToolCallingChatOptions)) { throw new IllegalArgumentException( "ExecuteToolAdvisor requires ToolCallingChatOptions to be set in the ChatClientRequest options."); } var optionsCopy = (ToolCallingChatOptions) chatClientRequest.prompt().getOptions().copy(); optionsCopy.setInternalToolExecutionEnabled(false); return internalStream(streamAdvisorChain, chatClientRequest, optionsCopy, chatClientRequest.prompt().getInstructions(), 0); } private Flux internalStream( StreamAdvisorChain streamAdvisorChain, ChatClientRequest originalRequest, ToolCallingChatOptions optionsCopy, List instructions, int jsonRetryCount) { return Flux.deferContextual(contextView -> { var processedRequest = ChatClientRequest.builder() .prompt(new Prompt(instructions, optionsCopy)) .context(originalRequest.context()) .build(); StreamAdvisorChain chainCopy = streamAdvisorChain.copy(this); Flux responseFlux = chainCopy.nextStream(processedRequest); AtomicReference aggregatedResponseRef = new AtomicReference(); AtomicReference chunksRef = new AtomicReference(new ArrayList()); return new ChatClientMessageAggregator() .aggregateChatClientResponse(responseFlux, aggregatedResponseRef::set) .doOnNext(chunk -> chunksRef.get().add(chunk)) .ignoreElements() .cast(ChatClientResponse.class) .concatWith(Flux.defer(() -> processAggregatedResponse( aggregatedResponseRef.get(), chunksRef.get(), processedRequest, streamAdvisorChain, originalRequest, optionsCopy, jsonRetryCount))); }); } private Flux processAggregatedResponse( ChatClientResponse aggregatedResponse, List chunks, ChatClientRequest finalRequest, StreamAdvisorChain streamAdvisorChain, ChatClientRequest originalRequest, ToolCallingChatOptions optionsCopy, int retryCount) { if (aggregatedResponse == null) { return Flux.fromIterable(chunks); } ChatResponse chatResponse = aggregatedResponse.chatResponse(); boolean isToolCall = chatResponse != null && chatResponse.hasToolCalls(); if (isToolCall) { Assert.notNull(chatResponse, "chatResponse must not be null when hasToolCalls is true"); ChatClientResponse finalAggregatedResponse = aggregatedResponse; Flux toolCallFlux = Flux.deferContextual(ctx -> { ToolExecutionResult toolExecutionResult; try { ToolCallReactiveContextHolder.setContext(ctx); toolExecutionResult = toolCallingManager.executeToolCalls(finalRequest.prompt(), chatResponse); } catch (Exception e) { if (retryCount < MAX_TOOL_RETRY) { List retryInstructions = buildRetryInstructions(finalRequest, chatResponse, e); if (retryInstructions != null) { return internalStream(streamAdvisorChain, originalRequest, optionsCopy, retryInstructions, retryCount + 1); } } throw e; } finally { ToolCallReactiveContextHolder.clearContext(); } List historyWithReminder = injectReminderIntoConversationHistory( toolExecutionResult.conversationHistory(), getAppId(finalRequest)); if (toolExecutionResult.returnDirect()) { return Flux.just(buildReturnDirectResponse(finalAggregatedResponse, chatResponse, toolExecutionResult, historyWithReminder)); } return internalStream(streamAdvisorChain, originalRequest, optionsCopy, historyWithReminder, 0); }); return toolCallFlux.subscribeOn(Schedulers.boundedElastic()); } return Flux.fromIterable(chunks); } /** * 获取 AppId */ private String getAppId(ChatClientRequest finalRequest) { if (finalRequest.prompt().getOptions() instanceof ToolCallingChatOptions toolCallingChatOptions) { return toolCallingChatOptions.getToolContext().get(CONVERSATION_ID).toString(); } throw new BusinessException(ErrorCode.SYSTEM_ERROR); } private static List buildRetryInstructions(ChatClientRequest finalRequest, ChatResponse chatResponse, Throwable error) { AssistantMessage assistantMessage = extractAssistantMessage(chatResponse); if (assistantMessage == null || assistantMessage.getToolCalls() == null || assistantMessage.getToolCalls().isEmpty()) { return null; } List instructions = new ArrayList(finalRequest.prompt().getInstructions()); instructions.add(assistantMessage); String errorMessage = buildJsonErrorMessage(error); List responses = assistantMessage.getToolCalls().stream() .map(toolCall -> new ToolResponseMessage.ToolResponse( toolCall.id(), toolCall.name(), errorMessage)) .toList(); instructions.add(ToolResponseMessage.builder().responses(responses).build()); return instructions; } private static AssistantMessage extractAssistantMessage(ChatResponse chatResponse) { if (chatResponse == null) { return null; } Generation result = chatResponse.getResult(); if (result != null && result.getOutput() != null) { return result.getOutput(); } List results = chatResponse.getResults(); if (results != null && !results.isEmpty() && results.get(0).getOutput() != null) { return results.get(0).getOutput(); } return null; } private static String buildJsonErrorMessage(Throwable error) { String detail = ExceptionUtils.getRootCauseMessage(error); if (detail.isBlank()) { return JSON_ERROR_MESSAGE; } return JSON_ERROR_MESSAGE + "\nError: " + detail; } /** * 对 conversationHistory 中的 TOOL 类消息，在其每个 ToolResponse 的 responseData 后追加提醒。 */ private List injectReminderIntoConversationHistory(List conversationHistory, String appId) { if (conversationHistory == null || conversationHistory.isEmpty()) { return conversationHistory; } if (!(conversationHistory.getLast() instanceof ToolResponseMessage toolMsg)) { return conversationHistory; } List responses = toolMsg.getResponses(); if (responses.isEmpty()) { return conversationHistory; } ToolResponseMessage.ToolResponse firstResponse = responses.getFirst(); if (!updateRoundsAndCheckReminder(appId, firstResponse.name())) { return conversationHistory; } List newResponses = new ArrayList(responses); ToolResponseMessage.ToolResponse actualRes = newResponses.removeFirst(); newResponses.add(new ToolResponseMessage.ToolResponse( firstResponse.id(), "text", TODO_REMINDER)); newResponses.add(actualRes); List result = new ArrayList( conversationHistory.subList(0, conversationHistory.size() - 1)); result.add(ToolResponseMessage.builder().responses(newResponses).build()); return result; } /** * 构造 returnDirect 时的 ChatClientResponse，使用注入提醒后的 conversationHistory 生成 generations。 */ private static ChatClientResponse buildReturnDirectResponse( ChatClientResponse aggregatedResponse, ChatResponse chatResponse, ToolExecutionResult originalResult, List historyWithReminder) { ToolExecutionResult resultWithReminder = ToolExecutionResult.builder() .conversationHistory(historyWithReminder) .returnDirect(originalResult.returnDirect()) .build(); ChatResponse newChatResponse = ChatResponse.builder() .from(chatResponse) .generations(ToolExecutionResult.buildGenerations(resultWithReminder)) .build(); return aggregatedResponse.mutate().chatResponse(newChatResponse).build(); } /** * updateRoundsAndCheckReminder * @param appId appId * @param methodName methodName * @return 是否需要更新 */ private boolean updateRoundsAndCheckReminder(String appId, String methodName) { if (TODO_METHOD.equals(methodName)) { roundsSinceTodo.put(appId, 0); return false; } int count = roundsSinceTodo.asMap().merge(appId, 1, Integer::sum); return count >= REMINDER_THRESHOLD; } @Override public String getName() { return "ExecuteToolAdvisor"; } @Override public int getOrder() { return ORDER; }}

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因为这个 Advisor 也使用到了 StreamAdvisorChain 接口的 copy 所以我们需要覆盖源码的这个 StreamAdvisorChain 并且实现对应的接口，下面的代码包路径是 org.springframework.ai.chat.client.advisor.api 具体的代码：

public interface StreamAdvisorChain extends AdvisorChain {
/**
* Invokes the next {@link StreamAdvisor} in the {@link StreamAdvisorChain} with the
* given request.
*/
Flux<ChatClientResponse> nextStream(ChatClientRequest chatClientRequest);
/**
* Returns the list of all the {@link StreamAdvisor} instances included in this chain
* at the time of its creation.
*/
List<StreamAdvisor> getStreamAdvisors();
/**
* Creates a new StreamAdvisorChain copy that contains all advisors after the
* specified advisor.
* @param after the StreamAdvisor after which to copy the chain
* @return a new StreamAdvisorChain containing all advisors after the specified
* advisor
* @throws IllegalArgumentException if the specified advisor is not part of the chain
*/
StreamAdvisorChain copy(StreamAdvisor after);
}

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下面的包位置是 org.springframework.ai.chat.client.advisor具体的实现代码：
[code]/** * Default implementation for the {@link BaseAdvisorChain}. Used by the {@link ChatClient} * to delegate the call to the next {@link CallAdvisor} or {@link StreamAdvisor} in the * chain. * * @author Christian Tzolov * @author Dariusz Jedrzejczyk * @author Thomas Vitale * @since 1.0.0 */public class DefaultAroundAdvisorChain implements BaseAdvisorChain { public static final AdvisorObservationConvention DEFAULT_OBSERVATION_CONVENTION = new DefaultAdvisorObservationConvention(); private static final ChatClientMessageAggregator CHAT_CLIENT_MESSAGE_AGGREGATOR = new ChatClientMessageAggregator(); private final List originalCallAdvisors; private final List originalStreamAdvisors; private final Deque callAdvisors; private final Deque streamAdvisors; private final ObservationRegistry observationRegistry; private final AdvisorObservationConvention observationConvention; DefaultAroundAdvisorChain(ObservationRegistry observationRegistry, Deque callAdvisors, Deque streamAdvisors, @Nullable AdvisorObservationConvention observationConvention) { Assert.notNull(observationRegistry, "the observationRegistry must be non-null"); Assert.notNull(callAdvisors, "the callAdvisors must be non-null"); Assert.notNull(streamAdvisors, "the streamAdvisors must be non-null"); this.observationRegistry = observationRegistry; this.callAdvisors = callAdvisors; this.streamAdvisors = streamAdvisors; this.originalCallAdvisors = List.copyOf(callAdvisors); this.originalStreamAdvisors = List.copyOf(streamAdvisors); this.observationConvention = observationConvention != null ? observationConvention : DEFAULT_OBSERVATION_CONVENTION; } public static Builder builder(ObservationRegistry observationRegistry) { return new Builder(observationRegistry); } @Override public ChatClientResponse nextCall(ChatClientRequest chatClientRequest) { Assert.notNull(chatClientRequest, "the chatClientRequest cannot be null"); if (this.callAdvisors.isEmpty()) { throw new IllegalStateException("No CallAdvisors available to execute"); } var advisor = this.callAdvisors.pop(); var observationContext = AdvisorObservationContext.builder() .advisorName(advisor.getName()) .chatClientRequest(chatClientRequest) .order(advisor.getOrder()) .build(); return AdvisorObservationDocumentation.AI_ADVISOR .observation(this.observationConvention, DEFAULT_OBSERVATION_CONVENTION, () -> observationContext, this.observationRegistry) .observe(() -> { var chatClientResponse = advisor.adviseCall(chatClientRequest, this); observationContext.setChatClientResponse(chatClientResponse); return chatClientResponse; }); } @Override public Flux nextStream(ChatClientRequest chatClientRequest) { Assert.notNull(chatClientRequest, "the chatClientRequest cannot be null"); return Flux.deferContextual(contextView -> { if (this.streamAdvisors.isEmpty()) { return Flux.error(new IllegalStateException("No StreamAdvisors available to execute")); } var advisor = this.streamAdvisors.pop(); AdvisorObservationContext observationContext = AdvisorObservationContext.builder() .advisorName(advisor.getName()) .chatClientRequest(chatClientRequest) .order(advisor.getOrder()) .build(); var observation = AdvisorObservationDocumentation.AI_ADVISOR.observation(this.observationConvention, DEFAULT_OBSERVATION_CONVENTION, () -> observationContext, this.observationRegistry); observation.parentObservation(contextView.getOrDefault(ObservationThreadLocalAccessor.KEY, null)).start(); // @formatter

ff Flux chatClientResponse = Flux.defer(() -> advisor.adviseStream(chatClientRequest, this) .doOnError(observation::error) .doFinally(s -> observation.stop()) .contextWrite(ctx -> ctx.put(ObservationThreadLocalAccessor.KEY, observation))); // @formatter

n return CHAT_CLIENT_MESSAGE_AGGREGATOR.aggregateChatClientResponse(chatClientResponse, observationContext::setChatClientResponse); }); } @Override public CallAdvisorChain copy(CallAdvisor after) { return this.copyAdvisorsAfter(this.getCallAdvisors(), after); } @Override public StreamAdvisorChain copy(StreamAdvisor after) { return this.copyAdvisorsAfter(this.getStreamAdvisors(), after); } private DefaultAroundAdvisorChain copyAdvisorsAfter(List

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