diff --git a/mcp-server/src/tools/initialize-project.js b/mcp-server/src/tools/initialize-project.js
index 16764b91..1895aeaa 100644
--- a/mcp-server/src/tools/initialize-project.js
+++ b/mcp-server/src/tools/initialize-project.js
@@ -5,6 +5,7 @@ import {
 	withNormalizedProjectRoot
 } from './utils.js';
 import { initializeProjectDirect } from '../core/task-master-core.js';
+import { BRAND_RULE_OPTIONS } from '../../../src/constants/rules.js';
 
 export function registerInitializeProjectTool(server) {
 	server.addTool({
@@ -37,10 +38,10 @@ export function registerInitializeProjectTool(server) {
 					'The root directory for the project. ALWAYS SET THIS TO THE PROJECT ROOT DIRECTORY. IF NOT SET, THE TOOL WILL NOT WORK.'
 				),
 			rules: z
-				.array(z.string())
+				.array(z.enum(BRAND_RULE_OPTIONS))
 				.optional()
 				.describe(
-					'List of rules to include at initialization (e.g., ["cursor", "roo"]). If omitted, defaults to all available brand rules.'
+					`List of rules to include at initialization. If omitted, defaults to all available brand rules. Available options: ${BRAND_RULE_OPTIONS.join(', ')}`
 				)
 		}),
 		execute: withNormalizedProjectRoot(async (args, context) => {
diff --git a/mcp-server/src/tools/rules.js b/mcp-server/src/tools/rules.js
index e45cf2fc..65c5a7fe 100644
--- a/mcp-server/src/tools/rules.js
+++ b/mcp-server/src/tools/rules.js
@@ -10,6 +10,7 @@ import {
 	withNormalizedProjectRoot
 } from './utils.js';
 import { rulesDirect } from '../core/direct-functions/rules.js';
+import { BRAND_RULE_OPTIONS } from '../../../src/constants/rules.js';
 
 /**
  * Register the rules tool with the MCP server
@@ -25,10 +26,10 @@ export function registerRulesTool(server) {
 				.enum(['add', 'remove'])
 				.describe('Whether to add or remove rules.'),
 			rules: z
-				.array(z.string())
+				.array(z.enum(BRAND_RULE_OPTIONS))
 				.min(1)
 				.describe(
-					'List of rules to add or remove (e.g., ["roo", "windsurf"]).'
+					`List of rules to add or remove. Available options: ${BRAND_RULE_OPTIONS.join(', ')}`
 				),
 			projectRoot: z
 				.string()
diff --git a/src/constants/rules.js b/src/constants/rules.js
new file mode 100644
index 00000000..662d4b02
--- /dev/null
+++ b/src/constants/rules.js
@@ -0,0 +1,28 @@
+/**
+ * @typedef {'cursor' | 'roo' | 'windsurf' | 'cline'} BrandRule
+ */
+
+/**
+ * Available brand rules for project initialization
+ * @type {BrandRule[]}
+ * @description Defines possible brand rule sets:
+ * - cursor: Cursor IDE rules (default)
+ * - roo: Roo Code IDE rules
+ * - windsurf: Windsurf IDE rules  
+ * - cline: Cline IDE rules
+ */
+export const BRAND_RULE_OPTIONS = [
+	'cursor',
+	'roo',
+	'windsurf',
+	'cline'
+];
+
+/**
+ * Check if a given brand rule is valid
+ * @param {string} brandRule - The brand rule to check
+ * @returns {boolean} True if the brand rule is valid, false otherwise
+ */
+export function isValidBrandRule(brandRule) {
+	return BRAND_RULE_OPTIONS.includes(brandRule);
+} 
\ No newline at end of file