feat(tools): Add tool call history to ToolContext

- Add TOOL_CALL_HISTORY constant to store tool call history
- Extend ToolContext with getToolConversationHistory method
- Include tool call history in tool context during function execution
- Add test coverage for tool call history verification

Resolves #1202

Author: tzolov

models/spring-ai-anthropic/src/test/java/org/springframework/ai/anthropic/client/AnthropicChatClientMethodInvokingFunctionCallbackIT.java

@@ -16,6 +16,7 @@
 
 package org.springframework.ai.anthropic.client;
 
+import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -27,6 +28,7 @@
 
 import org.springframework.ai.anthropic.AnthropicTestConfiguration;
 import org.springframework.ai.chat.client.ChatClient;
+import org.springframework.ai.chat.messages.Message;
 import org.springframework.ai.chat.model.ChatModel;
 import org.springframework.ai.chat.model.ToolContext;
 import org.springframework.ai.model.function.FunctionCallback;
@@ -158,6 +160,9 @@ void methodGetWeatherToolContext() {
 
 		assertThat(response).contains("30", "10", "15");
 		assertThat(arguments).containsEntry("tool", "value");
+		assertThat(arguments).containsKey(ToolContext.TOOL_CALL_HISTORY);
+		List<Message> tootConversationMessages = (List<Message>) arguments.get(ToolContext.TOOL_CALL_HISTORY);
+		assertThat(tootConversationMessages).hasSize(6);
 	}
 
 	@Test
@@ -252,6 +257,7 @@ public String getWeatherNonStatic(String city, Unit unit) {
 
 		public String getWeatherWithContext(String city, Unit unit, ToolContext context) {
 			arguments.put("tool", context.getContext().get("tool"));
+			arguments.put(ToolContext.TOOL_CALL_HISTORY, context.getToolCallHistory());
 			return getWeatherStatic(city, unit);
 		}
 

spring-ai-core/src/main/java/org/springframework/ai/chat/model/AbstractToolCallSupport.java

@@ -17,6 +17,7 @@
 package org.springframework.ai.chat.model;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -142,12 +143,23 @@ protected List<Message> handleToolCalls(Prompt prompt, ChatResponse response) {
 		Map<String, Object> toolContextMap = Map.of();
 		if (prompt.getOptions() instanceof FunctionCallingOptions functionCallOptions
 				&& !CollectionUtils.isEmpty(functionCallOptions.getToolContext())) {
-			toolContextMap = functionCallOptions.getToolContext();
+
+			toolContextMap = new HashMap<>(functionCallOptions.getToolContext());
+
+			List<Message> toolCallHistory = new ArrayList<>(prompt.copy().getInstructions());
+			toolCallHistory.add(new AssistantMessage(assistantMessage.getContent(), assistantMessage.getMetadata(),
+					assistantMessage.getToolCalls()));
+
+			toolContextMap.put(ToolContext.TOOL_CALL_HISTORY, toolCallHistory);
 		}
+
 		ToolResponseMessage toolMessageResponse = this.executeFunctions(assistantMessage,
 				new ToolContext(toolContextMap));
 
-		return this.buildToolCallConversation(prompt.getInstructions(), assistantMessage, toolMessageResponse);
+		List<Message> toolConversationHistory = this.buildToolCallConversation(prompt.getInstructions(),
+				assistantMessage, toolMessageResponse);
+
+		return toolConversationHistory;
 	}
 
 	protected List<Message> buildToolCallConversation(List<Message> previousMessages, AssistantMessage assistantMessage,

spring-ai-core/src/main/java/org/springframework/ai/chat/model/ToolContext.java

@@ -17,8 +17,11 @@
 package org.springframework.ai.chat.model;
 
 import java.util.Collections;
+import java.util.List;
 import java.util.Map;
 
+import org.springframework.ai.chat.messages.Message;
+
 /**
  * Represents the context for tool execution in a function calling scenario.
  *
@@ -33,11 +36,20 @@
  * {@code FunctionCallingOptions} and is used in the function execution process.
  * </p>
  *
+ * <p>
+ * The context map can contain any information that is relevant to the tool execution.
+ * </p>
+ *
  * @author Christian Tzolov
  * @since 1.0.0
  */
 public class ToolContext {
 
+	/**
+	 * The key for the running, tool call history stored in the context map.
+	 */
+	public static final String TOOL_CALL_HISTORY = "TOOL_CALL_HISTORY";
+
 	private final Map<String, Object> context;
 
 	/**
@@ -57,4 +69,13 @@ public Map<String, Object> getContext() {
 		return this.context;
 	}
 
+	/**
+	 * Returns the tool call history from the context map.
+	 * @return The tool call history.
+	 */
+	@SuppressWarnings("unchecked")
+	public List<Message> getToolCallHistory() {
+		return (List<Message>) this.context.get(TOOL_CALL_HISTORY);
+	}
+
 }