fix(agent): replace systemprompt (#4067)

Author: mengnankkkk

spring-ai-alibaba-agent-framework/src/main/java/com/alibaba/cloud/ai/graph/agent/ReactAgent.java

@@ -796,6 +796,10 @@ public void setInstruction(String instruction) {
 		llmNode.setInstruction(instruction);
 	}
 
+	public void setSystemPrompt(String systemPrompt) {
+		llmNode.setSystemPrompt(systemPrompt);
+	}
+
 	public Map<String, Object> getThreadState(String threadId) {
 		return threadIdStateMap.get(threadId);
 	}

spring-ai-alibaba-agent-framework/src/main/java/com/alibaba/cloud/ai/graph/agent/node/AgentLlmNode.java

@@ -125,6 +125,10 @@ public void setInstruction(String instruction) {
 		this.instruction = instruction;
 	}
 
+	public void setSystemPrompt(String systemPrompt) {
+		this.systemPrompt = systemPrompt;
+	}
+
 	@Override
 	public Map<String, Object> apply(OverAllState state, RunnableConfig config) throws Exception {
 		if (enableReasoningLog && logger.isDebugEnabled()) {

spring-ai-alibaba-agent-framework/src/test/java/com/alibaba/cloud/ai/graph/agent/ReactAgentTest.java

@@ -969,5 +969,45 @@ public void testInstructionSentToLLM() throws Exception {
 		assertTrue(response.getText().length() > 0, "响应应该有内容");
 	}
 
-}
 
+	@Test
+	public void testDynamicSystemPromptUpdate() throws Exception {
+		String initialSystemPrompt = "你是一个专业的技术助手，回答要简洁明了。";
+		String updatedSystemPrompt = "你是一个诗歌创作专家，用优美的语言回答问题。";
+		String finalSystemPrompt = "你是一个数学专家，用精确的数字回答问题。";
+
+		ReactAgent agent = ReactAgent.builder()
+				.name("dynamic_system_prompt_agent")
+				.model(chatModel)
+				.systemPrompt(initialSystemPrompt)
+				.saver(new MemorySaver())
+				.enableLogging(true)
+				.build();
+
+		assertNotNull(agent, "Agent 不应为空");
+
+		AssistantMessage response1 = agent.call("什么是 Java？");
+		assertNotNull(response1, "第一次响应不应为空");
+		assertFalse(response1.getText().isEmpty(), "第一次响应不应为空字符串");
+		System.out.println(response1.getText());
+
+		agent.setSystemPrompt(updatedSystemPrompt);
+
+		AssistantMessage response2 = agent.call("什么是 Spring？");
+		assertNotNull(response2, "第二次响应不应为空");
+		assertFalse(response2.getText().isEmpty(), "第二次响应不应为空字符串");
+		System.out.println(response2.getText());
+
+		agent.setSystemPrompt(finalSystemPrompt);
+
+		AssistantMessage response3 = agent.call("1+1等于多少？");
+		assertNotNull(response3, "第三次响应不应为空");
+		assertFalse(response3.getText().isEmpty(), "第三次响应不应为空字符串");
+		System.out.println(response3.getText());
+
+		assertTrue(response1.getText().length() > 0, "第一次响应应该有内容");
+		assertTrue(response2.getText().length() > 0, "第二次响应应该有内容");
+		assertTrue(response3.getText().length() > 0, "第三次响应应该有内容");
+	}
+
+}

spring-boot-starters/spring-ai-alibaba-starter-config-nacos/src/main/java/com/alibaba/cloud/ai/agent/nacos/NacosReactAgentBuilder.java

@@ -72,7 +72,7 @@ public ReactAgent build() {
 		//2.load prompt vo
 		PromptVO promptVO = getPromptByKey(nacosOptions, agentVO.getPromptKey());
 		agentVOHolder.setPromptVO(promptVO);
-		this.instruction = promptVO.getTemplate();
+		String systemPrompt = promptVO.getTemplate();
 
 		//3.load model vo
 		ModelVO modelVO = NacosModelInjector.getModelByAgentName(nacosOptions);
@@ -96,7 +96,6 @@ public ReactAgent build() {
 		}
 
 		clientBuilder.defaultOptions(chatOptions);
-		clientBuilder.defaultSystem(instruction);
 		chatClient = clientBuilder.build();
 
 		//6.load mcp servers
@@ -106,7 +105,9 @@ public ReactAgent build() {
 		this.tools = convert(nacosOptions, mcpServersVO);
 
 		//7. build tools
-		AgentLlmNode.Builder llmNodeBuilder = AgentLlmNode.builder().chatClient(chatClient);
+		AgentLlmNode.Builder llmNodeBuilder = AgentLlmNode.builder()
+				.chatClient(chatClient)
+				.systemPrompt(systemPrompt);
 		if (outputKey != null && !outputKey.isEmpty()) {
 			llmNodeBuilder.outputKey(outputKey);
 		}
@@ -304,7 +305,7 @@ public void receiveConfigInfo(String configInfo) {
 		if (promptVO != null && promptVO.getTemplate() != null) {
 			nacosContextHolder.getObservationMetadataAwareOptions().getObservationMetadata()
 					.putAll(getMetadata(promptVO));
-			reactAgent.setInstruction(promptVO.getTemplate());
+			reactAgent.setSystemPrompt(promptVO.getTemplate());
 		}
 
 	}
@@ -341,7 +342,7 @@ public void receiveConfigInfo(String configInfo) {
 			PromptVO newPromptVO = getPromptByKey(nacosOptions, newPromptKey);
 			nacosContextHolder.getObservationMetadataAwareOptions().getObservationMetadata()
 					.putAll(getMetadata(newPromptVO));
-			nacosContextHolder.getReactAgent().setInstruction(newPromptVO.getTemplate());
+			nacosContextHolder.getReactAgent().setSystemPrompt(newPromptVO.getTemplate());
 
 			NacosReactAgentBuilder.registerPromptListener(nacosOptions, nacosContextHolder, newPromptKey, nacosContextHolder.getReactAgent());
 		}