Add Mistral AI tool_call_id to ChatCompletionMessage.

  The tool call ID that this message is responding to, applicable for the TOOL role.

models/spring-ai-mistral-ai/src/main/java/org/springframework/ai/mistralai/MistralAiChatClient.java

@@ -250,7 +250,8 @@ protected ChatCompletionRequest doCreateToolResponseRequest(ChatCompletionReques
 		// message.
 		for (ToolCall toolCall : responseMessage.toolCalls()) {
 
-			var functionName = toolCall.function().name();
+			String id = toolCall.id();
+			String functionName = toolCall.function().name();
 			String functionArguments = toolCall.function().arguments();
 
 			if (!this.functionCallbackRegister.containsKey(functionName)) {
@@ -260,8 +261,8 @@ protected ChatCompletionRequest doCreateToolResponseRequest(ChatCompletionReques
 			String functionResponse = this.functionCallbackRegister.get(functionName).call(functionArguments);
 
 			// Add the function response to the conversation.
-			conversationHistory
-				.add(new ChatCompletionMessage(functionResponse, ChatCompletionMessage.Role.TOOL, functionName, null));
+			conversationHistory.add(new ChatCompletionMessage(functionResponse, ChatCompletionMessage.Role.TOOL,
+					functionName, null, id));
 		}
 
 		// Recursively call chatCompletionWithTools until the model doesn't call a

models/spring-ai-mistral-ai/src/main/java/org/springframework/ai/mistralai/api/MistralAiApi.java

@@ -452,24 +452,39 @@ public record ResponseFormat(@JsonProperty("type") String type) {
 	 * types.
 	 * @param toolCalls The tool calls generated by the model, such as function calls.
 	 * Applicable only for {@link Role#ASSISTANT} role and null otherwise.
+	 * @param toolCallId Tool call that this message is responding to. Only applicable for
+	 * the {@link Role#TOOL} role and null otherwise.
 	 */
 	@JsonInclude(Include.NON_NULL)
 	public record ChatCompletionMessage(
 	// @formatter:off
 		 @JsonProperty("content") String content,
 		 @JsonProperty("role") Role role,
 		 @JsonProperty("name") String name,
-		 @JsonProperty("tool_calls") List<ToolCall> toolCalls) {
+		 @JsonProperty("tool_calls") List<ToolCall> toolCalls,
+		 @JsonProperty("tool_call_id") String toolCallId) {
 		 // @formatter:on
 
+		/**
+		 * Message comprising the conversation.
+		 * @param content The contents of the message.
+		 * @param role The role of the messages author. Could be one of the {@link Role}
+		 * types.
+		 * @param toolCalls The tool calls generated by the model, such as function calls.
+		 * Applicable only for {@link Role#ASSISTANT} role and null otherwise.
+		 */
+		public ChatCompletionMessage(String content, Role role, String name, List<ToolCall> toolCalls) {
+			this(content, role, name, toolCalls, null);
+		}
+
 		/**
 		 * Create a chat completion message with the given content and role. All other
 		 * fields are null.
 		 * @param content The contents of the message.
 		 * @param role The role of the author of this message.
 		 */
 		public ChatCompletionMessage(String content, Role role) {
-			this(content, role, null, null);
+			this(content, role, null, null, null);
 		}
 
 		/**