feat: Added the annotations attribute to McpSchema.Tool (#313)

Signed-off-by: Sun Yuhan <sunyuhan1998@users.noreply.github.com>

mcp/src/test/java/io/modelcontextprotocol/spec/McpSchemaTests.java

@@ -682,6 +682,36 @@ public class McpSchemaTests {
 		assertThat(deserializedTool.inputSchema().defs()).containsKey("Address");
 	}
 
+	@Test
+	void testToolWithAnnotations() throws Exception {
+		String schemaJson = """
+				{
+					"type": "object",
+					"properties": {
+						"name": {
+							"type": "string"
+						},
+						"value": {
+							"type": "number"
+						}
+					},
+					"required": ["name"]
+				}
+				""";
+		McpSchema.ToolAnnotations annotations = new McpSchema.ToolAnnotations("A test tool", false, false, false, false,
+				false);
+
+		McpSchema.Tool tool = new McpSchema.Tool("test-tool", "A test tool", schemaJson, annotations);
+
+		String value = mapper.writeValueAsString(tool);
+		assertThatJson(value).when(Option.IGNORING_ARRAY_ORDER)
+			.when(Option.IGNORING_EXTRA_ARRAY_ITEMS)
+			.isObject()
+			.isEqualTo(
+					json("""
+							{"name":"test-tool","description":"A test tool","inputSchema":{"type":"object","properties":{"name":{"type":"string"},"value":{"type":"number"}},"required":["name"]},"annotations":{"title":"A test tool","readOnlyHint":false,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false,"returnDirect":false}}"""));
+	}
+
 	@Test
 	void testCallToolRequest() throws Exception {
 		Map<String, Object> arguments = new HashMap<>();