fix(core): Allow Unicode characters in execution metadata keys (#30486)

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/core/src/execution-engine/node-execution-context/utils/__tests__/execution-metadata.test.ts

@@ -173,4 +173,63 @@ describe('Execution Metadata functions', () => {
 			test1: longValue.slice(0, 512),
 		});
 	});
+
+	// GHC-8254: AI Agent node with Chinese name fails with "Custom date key can only contain characters A-Za-z0-9_"
+	describe('Unicode support in keys (GHC-8254)', () => {
+		test('should allow Chinese characters in keys', () => {
+			const { metadata, executionData } = createExecutionDataWithMetadata();
+
+			// Simulates AI Agent node named "测试" generating key "response_测试"
+			const chineseKey = 'response_测试';
+			expect(() => setWorkflowExecutionMetadata(executionData, chineseKey, 'value1')).not.toThrow();
+
+			expect(metadata).toHaveProperty(chineseKey, 'value1');
+		});
+
+		test('should allow other Unicode characters (Japanese, Korean)', () => {
+			const { metadata, executionData } = createExecutionDataWithMetadata();
+
+			// Japanese
+			const japaneseKey = 'response_テスト';
+			expect(() =>
+				setWorkflowExecutionMetadata(executionData, japaneseKey, 'value1'),
+			).not.toThrow();
+
+			// Korean
+			const koreanKey = 'response_테스트';
+			expect(() => setWorkflowExecutionMetadata(executionData, koreanKey, 'value2')).not.toThrow();
+
+			expect(metadata).toHaveProperty(japaneseKey, 'value1');
+			expect(metadata).toHaveProperty(koreanKey, 'value2');
+		});
+
+		test('should allow Unicode combining marks (Devanagari)', () => {
+			const { metadata, executionData } = createExecutionDataWithMetadata();
+
+			// `lodash/snakeCase('नमस्ते')` preserves combining marks (e.g. U+094D virama,
+			// U+0947 vowel sign) which fall under \p{M}, not \p{L}.
+			const devanagariKey = 'response_नमस्ते';
+			expect(() =>
+				setWorkflowExecutionMetadata(executionData, devanagariKey, 'value1'),
+			).not.toThrow();
+
+			expect(metadata).toHaveProperty(devanagariKey, 'value1');
+		});
+
+		test('should still reject special characters that could cause issues', () => {
+			const { metadata, executionData } = createExecutionDataWithMetadata();
+
+			// Control characters should still be rejected
+			expect(() => setWorkflowExecutionMetadata(executionData, 'test\x00key', 'value')).toThrow(
+				InvalidExecutionMetadataError,
+			);
+
+			// Newlines should be rejected
+			expect(() => setWorkflowExecutionMetadata(executionData, 'test\nkey', 'value')).toThrow(
+				InvalidExecutionMetadataError,
+			);
+
+			expect(metadata).toEqual({});
+		});
+	});
 });

packages/core/src/execution-engine/node-execution-context/utils/execution-metadata.ts

@@ -23,11 +23,11 @@ export function setWorkflowExecutionMetadata(
 	if (typeof key !== 'string') {
 		throw new InvalidExecutionMetadataError('key', key);
 	}
-	if (key.replace(/[A-Za-z0-9_]/g, '').length !== 0) {
+	if (key.replace(/[\p{L}\p{N}\p{M}_]/gu, '').length !== 0) {
 		throw new InvalidExecutionMetadataError(
 			'key',
 			key,
-			`Custom date key can only contain characters "A-Za-z0-9_" (key "${key}")`,
+			`Custom data key can only contain letters, numbers, and underscores (key "${key}")`,
 		);
 	}
 	if (typeof value !== 'string' && typeof value !== 'number' && typeof value !== 'bigint') {