refactor(bedrock): Migrate from function calling to tool calling

- Replace function calling with tool calling in BedrockProxyChatModel
- Deprecate function calling related code and APIs
- Add new tool calling manager and options
- Update builder pattern to remove "with" prefix from methods
- Update tests and documentation for tool calling

Part of the #2207 epic

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

Author: tzolov

models/spring-ai-bedrock-converse/src/main/java/org/springframework/ai/bedrock/converse/BedrockProxyChatModel.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 the original author or authors.
+ * Copyright 2023-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -331,6 +331,10 @@ public static Document getChatOptionsAdditionalModelRequestFields(ChatOptions de
 		attributes.remove("toolContext");
 		attributes.remove("functionCallbacks");
 
+		attributes.remove("toolCallbacks");
+		attributes.remove("toolNames");
+		attributes.remove("internalToolExecutionEnabled");
+
 		attributes.remove("temperature");
 		attributes.remove("topK");
 		attributes.remove("stopSequences");

models/spring-ai-bedrock-converse/src/main/java/org/springframework/ai/bedrock/converse/api/ConverseApiUtils.java

@@ -380,7 +380,8 @@ void multiModalityEmbeddedImage(String modelName) throws IOException {
 
 	@ParameterizedTest(name = "{0} : {displayName} ")
 	@ValueSource(strings = { "anthropic.claude-3-5-sonnet-20240620-v1:0" })
-	void multiModalityImageUrl(String modelName) throws IOException {
+	@Deprecated
+	void multiModalityImageUrl2(String modelName) throws IOException {
 
 		// TODO: add url method that wrapps the checked exception.
 		URL url = new URL("https://docs.spring.io/spring-ai/reference/_images/multimodal.test.png");
@@ -398,6 +399,26 @@ void multiModalityImageUrl(String modelName) throws IOException {
 		assertThat(response).containsAnyOf("bananas", "apple", "bowl", "basket", "fruit stand");
 	}
 
+	@ParameterizedTest(name = "{0} : {displayName} ")
+	@ValueSource(strings = { "anthropic.claude-3-5-sonnet-20240620-v1:0" })
+	void multiModalityImageUrl(String modelName) throws IOException {
+
+		// TODO: add url method that wrapps the checked exception.
+		URL url = new URL("https://docs.spring.io/spring-ai/reference/_images/multimodal.test.png");
+
+		// @formatter:off
+		String response = ChatClient.create(this.chatModel).prompt()
+		// TODO consider adding model(...) method to ChatClient as a shortcut to
+		.options(ToolCallingChatOptions.builder().model(modelName).build())
+		.user(u -> u.text("Explain what do you see on this picture?").media(MimeTypeUtils.IMAGE_PNG, url))
+		.call()
+		.content();
+		// @formatter:on
+
+		logger.info(response);
+		assertThat(response).containsAnyOf("bananas", "apple", "bowl", "basket", "fruit stand");
+	}
+
 	@Test
 	void streamingMultiModalityImageUrl() throws IOException {
 

models/spring-ai-bedrock-converse/src/test/java/org/springframework/ai/bedrock/converse/BedrockConverseChatClientIT.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 the original author or authors.
+ * Copyright 2023-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,10 +38,10 @@ public BedrockProxyChatModel bedrockConverseChatModel() {
 		String modelId = "anthropic.claude-3-5-sonnet-20240620-v1:0";
 
 		return BedrockProxyChatModel.builder()
-			.withCredentialsProvider(EnvironmentVariableCredentialsProvider.create())
-			.withRegion(Region.US_EAST_1)
-			.withTimeout(Duration.ofSeconds(120))
-			// .withRegion(Region.US_EAST_1)
+			.credentialsProvider(EnvironmentVariableCredentialsProvider.create())
+			.region(Region.US_EAST_1)
+			// .region(Region.US_EAST_1)
+			.timeout(Duration.ofSeconds(120))
 			.withDefaultOptions(FunctionCallingOptions.builder().model(modelId).build())
 			.build();
 	}

models/spring-ai-bedrock-converse/src/test/java/org/springframework/ai/bedrock/converse/BedrockConverseTestConfiguration.java

@@ -20,6 +20,7 @@
 
 import io.micrometer.observation.ObservationRegistry;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.Mock;

models/spring-ai-bedrock-converse/src/test/java/org/springframework/ai/bedrock/converse/BedrockConverseUsageAggregationTests.java

@@ -48,6 +48,8 @@
 import org.springframework.ai.model.Media;
 import org.springframework.ai.model.function.FunctionCallback;
 import org.springframework.ai.model.function.FunctionCallingOptions;
+import org.springframework.ai.model.tool.ToolCallingChatOptions;
+import org.springframework.ai.tool.function.FunctionToolCallback;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.test.context.SpringBootTest;
@@ -244,8 +246,9 @@ void multiModalityTest() throws IOException {
 				"fruit stand");
 	}
 
+	@Deprecated
 	@Test
-	void functionCallTest() {
+	void functionCallTestDeprecated() {
 
 		UserMessage userMessage = new UserMessage(
 				"What's the weather like in San Francisco, Tokyo and Paris? Return the result in Celsius.");
@@ -269,6 +272,29 @@ void functionCallTest() {
 		assertThat(generation.getOutput().getText()).contains("30", "10", "15");
 	}
 
+	@Test
+	void functionCallTest() {
+
+		UserMessage userMessage = new UserMessage(
+				"What's the weather like in San Francisco, Tokyo and Paris? Return the result in Celsius.");
+
+		List<Message> messages = new ArrayList<>(List.of(userMessage));
+
+		var promptOptions = ToolCallingChatOptions.builder()
+			.toolCallbacks(List.of(FunctionToolCallback.builder("getCurrentWeather", new MockWeatherService())
+				.description("Get the weather in location. Return in 36°C format")
+				.inputType(MockWeatherService.Request.class)
+				.build()))
+			.build();
+
+		ChatResponse response = this.chatModel.call(new Prompt(messages, promptOptions));
+
+		logger.info("Response: {}", response);
+
+		Generation generation = response.getResult();
+		assertThat(generation.getOutput().getText()).contains("30", "10", "15");
+	}
+
 	@Test
 	void streamFunctionCallTest() {
 

models/spring-ai-bedrock-converse/src/test/java/org/springframework/ai/bedrock/converse/BedrockProxyChatModelIT.java

@@ -20,6 +20,7 @@
 import java.time.Duration;
 import java.util.Set;
 
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -32,7 +33,6 @@
 import org.springframework.ai.chat.model.ChatModel;
 import org.springframework.ai.model.Media;
 import org.springframework.ai.model.function.FunctionCallingOptions;
-import org.springframework.ai.model.tool.ToolCallingChatOptions;
 import org.springframework.ai.tool.function.FunctionToolCallback;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringBootConfiguration;
@@ -47,6 +47,7 @@
 /**
  * @author Christian Tzolov
  */
+@Disabled
 @SpringBootTest(classes = BedrockNovaChatClientIT.Config.class)
 @RequiresAwsCredentials
 public class BedrockNovaChatClientIT {
@@ -181,9 +182,9 @@ public BedrockProxyChatModel bedrockConverseChatModel() {
 			String modelId = "amazon.nova-pro-v1:0";
 
 			return BedrockProxyChatModel.builder()
-				.withCredentialsProvider(EnvironmentVariableCredentialsProvider.create())
-				.withRegion(Region.US_EAST_1)
-				.withTimeout(Duration.ofSeconds(120))
+				.credentialsProvider(EnvironmentVariableCredentialsProvider.create())
+				.region(Region.US_EAST_1)
+				.timeout(Duration.ofSeconds(120))
 				.withDefaultOptions(FunctionCallingOptions.builder().model(modelId).build())
 				.build();
 		}

models/spring-ai-bedrock-converse/src/test/java/org/springframework/ai/bedrock/converse/client/BedrockNovaChatClientIT.java

@@ -62,6 +62,7 @@
 import org.springframework.ai.openai.api.OpenAiApi.ChatCompletionRequest.AudioParameters.Voice;
 import org.springframework.ai.openai.api.tool.MockWeatherService;
 import org.springframework.ai.openai.testutils.AbstractIT;
+import org.springframework.ai.tool.function.FunctionToolCallback;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.core.convert.support.DefaultConversionService;
@@ -332,7 +333,8 @@ void beanStreamOutputConverterRecords() {
 	}
 
 	@Test
-	void functionCallTest() {
+	@Deprecated
+	void functionCallTestDeprecated() {
 
 		UserMessage userMessage = new UserMessage("What's the weather like in San Francisco, Tokyo, and Paris?");
 
@@ -356,6 +358,28 @@ void functionCallTest() {
 		assertThat(response.getResult().getOutput().getText()).containsAnyOf("15.0", "15");
 	}
 
+	@Test
+	void functionCallTest() {
+
+		UserMessage userMessage = new UserMessage("What's the weather like in San Francisco, Tokyo, and Paris?");
+
+		List<Message> messages = new ArrayList<>(List.of(userMessage));
+
+		var promptOptions = OpenAiChatOptions.builder()
+			.model(OpenAiApi.ChatModel.GPT_4_O.getValue())
+			.toolCallbacks(List.of(FunctionToolCallback.builder("getCurrentWeather", new MockWeatherService())
+				.description("Get the weather in location")
+				.inputType(MockWeatherService.Request.class)
+				.build()))
+			.build();
+
+		ChatResponse response = this.chatModel.call(new Prompt(messages, promptOptions));
+
+		logger.info("Response: {}", response);
+
+		assertThat(response.getResult().getOutput().getText()).contains("30", "10", "15");
+	}
+
 	@Test
 	void streamFunctionCallTest() {
 

models/spring-ai-bedrock-converse/src/test/java/org/springframework/ai/bedrock/converse/experiments/BedrockConverseChatModelMain2.java

@@ -90,20 +90,19 @@ The prefix `spring.ai.bedrock.converse.chat` is the property prefix that configu
 
 == Runtime Options [[chat-options]]
 
-Use the portable `ChatOptions` or `FunctionCallingOptions` portable builders to create model configurations, such as temperature, maxToken, topP, etc.
+Use the portable `ChatOptions` or `ToolCallingChatOptions` portable builders to create model configurations, such as temperature, maxToken, topP, etc.
 
 On start-up, the default options can be configured with the `BedrockConverseProxyChatModel(api, options)` constructor or the `spring.ai.bedrock.converse.chat.options.*` properties.
 
 At run-time you can override the default options by adding new, request specific, options to the `Prompt` call:
 
 [source,java]
 ----
-var options = FunctionCallingOptions.builder()
-        .withModel("anthropic.claude-3-5-sonnet-20240620-v1:0")
-        .withTemperature(0.6)
-        .withMaxTokens(300)
-        .withFunctionCallbacks(List.of(FunctionCallback.builder()
-            .function("getCurrentWeather", new WeatherService())
+var options = ToolCallingChatOptions.builder()
+        .model("anthropic.claude-3-5-sonnet-20240620-v1:0")
+        .temperature(0.6)
+        .maxTokens(300)
+        .toolCallbacks(List.of(FunctionToolCallback.builder("getCurrentWeather", new WeatherService())
             .description("Get the weather in location. Return temperature in 36°F or 36°C format. Use multi-turn if needed.")
             .inputType(WeatherService.Request.class)
             .build()))
@@ -118,7 +117,28 @@ String response = ChatClient.create(this.chatModel)
 
 == Tool/Function Calling
 
-The Bedrock Converse API supports function calling capabilities, allowing models to use tools during conversations. Here's an example of how to define and use functions:
+The Bedrock Converse API supports tool calling capabilities, allowing models to use tools during conversations. 
+Here's an example of how to define and use @Tool based tools:
+
+[source,java]
+----
+
+public class WeatherService {
+
+    @Tool(description = "Get the weather in location")
+    public String weatherByLocation(@ToolParam(description= "City or state name") String location) {
+        ...
+    }
+}
+
+String response = ChatClient.create(this.chatModel)
+        .prompt("What's the weather like in Boston?")				
+        .tools(new WeatherService())
+        .call()
+        .content();
+----
+
+You can use the java.util.function beans as tools as well:
 
 [source,java]
 ----
@@ -130,12 +150,14 @@ public Function<Request, Response> weatherFunction() {
 
 String response = ChatClient.create(this.chatModel)
         .prompt("What's the weather like in Boston?")				
-        .function("weatherFunction")
+        .tools("weatherFunction")
         .inputType(Request.class)
         .call()
         .content();
 ----
 
+Find more in xref:api/tools.adoc[Tools] documentation.
+
 == Multimodal
 
 Multimodality refers to a model's ability to simultaneously understand and process information from various sources, including text, images, video, pdf, doc, html, md and more data formats.