fix: reverse ToolContext validation logic in MethodToolCallback

Changes the validation logic in MethodToolCallback to check if a ToolContext is required by the method but not provided,
rather than checking if a ToolContext is provided but not supported by the method.
This ensures methods that expect a ToolContext parameter receive one.

Updates tests cases to reflect the new validation logic

Resolves spring-projects#2337

Signed-off-by: Christian Tzolov <[email protected]>

Author: tzolov

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

@@ -192,13 +192,13 @@ void methodGetWeatherToolContext() {
 	}
 
 	@Test
-	void methodGetWeatherToolContextButNonContextMethod() {
+	void methodGetWeatherWithContextMethodButMissingContext() {
 
 		TestFunctionClass targetObject = new TestFunctionClass();
 
 		// @formatter:off
 		var toolMethod = ReflectionUtils.findMethod(
-			TestFunctionClass.class, "getWeatherNonStatic", String.class, Unit.class);
+			TestFunctionClass.class, "getWeatherWithContext", String.class, Unit.class, ToolContext.class);
 
 		assertThatThrownBy(() -> ChatClient.create(this.chatModel).prompt()
 				.user("What's the weather like in San Francisco, Tokyo, and Paris?  Use Celsius.")
@@ -209,11 +209,10 @@ void methodGetWeatherToolContextButNonContextMethod() {
 					.toolMethod(toolMethod)
 					.toolObject(targetObject)
 					.build())
-				.toolContext(Map.of("tool", "value"))
 				.call()
 				.content())
 				.isInstanceOf(IllegalArgumentException.class)
-				.hasMessage("ToolContext is not supported by the method as an argument");
+				.hasMessage("ToolContext is required by the method as an argument");
 		// @formatter:on
 	}
 

models/spring-ai-openai/src/test/java/org/springframework/ai/openai/chat/client/OpenAiChatClientMethodInvokingFunctionCallbackIT.java

@@ -165,12 +165,12 @@ void methodGetWeatherToolContext() {
 	}
 
 	@Test
-	void methodGetWeatherToolContextButNonContextMethod() {
+	void methodGetWeatherToolContextButMissingContextArgument() {
 
 		TestFunctionClass targetObject = new TestFunctionClass();
 
-		var toolMethod = ReflectionUtils.findMethod(TestFunctionClass.class, "getWeatherNonStatic", String.class,
-				Unit.class);
+		var toolMethod = ReflectionUtils.findMethod(TestFunctionClass.class, "getWeatherWithContext", String.class,
+				Unit.class, ToolContext.class);
 
 		// @formatter:off
 		assertThatThrownBy(() -> ChatClient.create(this.chatModel).prompt()
@@ -181,12 +181,11 @@ void methodGetWeatherToolContextButNonContextMethod() {
 						.build())
 					.toolMethod(toolMethod)
 					.toolObject(targetObject)
-					.build())
-				.toolContext(Map.of("tool", "value"))
+					.build())				
 				.call()
 				.content())
 				.isInstanceOf(IllegalArgumentException.class)
-				.hasMessage("ToolContext is not supported by the method as an argument");
+				.hasMessage("ToolContext is required by the method as an argument");
 		// @formatter:on
 	}
 

spring-ai-core/src/main/java/org/springframework/ai/tool/method/MethodToolCallback.java

@@ -115,11 +115,11 @@ public String call(String toolInput, @Nullable ToolContext toolContext) {
 	}
 
 	private void validateToolContextSupport(@Nullable ToolContext toolContext) {
-		var isToolContextRequired = toolContext != null && !CollectionUtils.isEmpty(toolContext.getContext());
+		var isNonEmptyToolContextProvided = toolContext != null && !CollectionUtils.isEmpty(toolContext.getContext());
 		var isToolContextAcceptedByMethod = Stream.of(toolMethod.getParameterTypes())
 			.anyMatch(type -> ClassUtils.isAssignable(type, ToolContext.class));
-		if (isToolContextRequired && !isToolContextAcceptedByMethod) {
-			throw new IllegalArgumentException("ToolContext is not supported by the method as an argument");
+		if (isToolContextAcceptedByMethod && !isNonEmptyToolContextProvided) {
+			throw new IllegalArgumentException("ToolContext is required by the method as an argument");
 		}
 	}
 

spring-ai-core/src/test/java/org/springframework/ai/tool/method/MethodToolCallbackTests.java

@@ -69,23 +69,21 @@ void shouldHandleToolContextWhenSupported() {
 	}
 
 	@Test
-	void shouldThrowExceptionWhenToolContextNotSupported() {
-		Method toolMethod = getMethod("publicMethod", PublicTools.class);
+	void shouldThrowExceptionWhenToolContextArgumentIsMissing() {
+		Method toolMethod = getMethod("methodWithToolContext", ToolContextTools.class);
 		MethodToolCallback callback = MethodToolCallback.builder()
 			.toolDefinition(ToolDefinition.from(toolMethod))
 			.toolMetadata(ToolMetadata.from(toolMethod))
 			.toolMethod(toolMethod)
 			.toolObject(new PublicTools())
 			.build();
 
-		ToolContext toolContext = new ToolContext(Map.of("key", "value"));
-
 		assertThatThrownBy(() -> callback.call("""
 				{
 				    "input": "test"
 				}
-				""", toolContext)).isInstanceOf(IllegalArgumentException.class)
-			.hasMessageContaining("ToolContext is not supported");
+				""")).isInstanceOf(IllegalArgumentException.class)
+			.hasMessageContaining("ToolContext is required by the method as an argument");
 	}
 
 	@Test