diff --git a/packages/agents-a365-observability/src/utils/logging.ts b/packages/agents-a365-observability/src/utils/logging.ts
index 9a77f865..d8da4664 100644
--- a/packages/agents-a365-observability/src/utils/logging.ts
+++ b/packages/agents-a365-observability/src/utils/logging.ts
@@ -201,9 +201,10 @@ export function setLogger(customLogger: ILogger): void {
     !customLogger ||
     typeof customLogger.info !== 'function' ||
     typeof customLogger.warn !== 'function' ||
-    typeof customLogger.error !== 'function'
+    typeof customLogger.error !== 'function' ||
+    typeof customLogger.event !== 'function'
   ) {
-    throw new Error('Custom logger must implement ILogger interface (info, warn, error methods)');
+    throw new Error('Custom logger must implement ILogger interface (info, warn, error, event methods)');
   }
   globalLogger = customLogger;
 }
diff --git a/tests/observability/core/custom-logger.test.ts b/tests/observability/core/custom-logger.test.ts
index c8f914e4..eed4a24c 100644
--- a/tests/observability/core/custom-logger.test.ts
+++ b/tests/observability/core/custom-logger.test.ts
@@ -86,14 +86,14 @@ describe('Custom Logger Support', () => {
 
   describe('Global Logger Management', () => {
     it('should set and get custom logger', () => {
-      const custom: ILogger = { info: jest.fn(), warn: jest.fn(), error: jest.fn() };
+      const custom: ILogger = { info: jest.fn(), warn: jest.fn(), error: jest.fn(), event: jest.fn() };
       
       setLogger(custom);
       expect(getLogger()).toBe(custom);
     });
 
     it('should reset to default logger', () => {
-      const custom: ILogger = { info: jest.fn(), warn: jest.fn(), error: jest.fn() };
+      const custom: ILogger = { info: jest.fn(), warn: jest.fn(), error: jest.fn(), event: jest.fn() };
       setLogger(custom);
       
       resetLogger();
@@ -111,7 +111,8 @@ describe('Custom Logger Support', () => {
       const customLogger: ILogger = {
         info: jest.fn(),
         warn: jest.fn(),
-        error: jest.fn()
+        error: jest.fn(),
+        event: jest.fn()
       };
 
       setLogger(customLogger);
@@ -130,7 +131,8 @@ describe('Custom Logger Support', () => {
       const selectiveLogger: ILogger = {
         info: () => {},
         warn: jest.fn(),
-        error: () => {}
+        error: () => {},
+        event: () => {}
       };
 
       setLogger(selectiveLogger);
@@ -149,7 +151,8 @@ describe('Custom Logger Support', () => {
       const customLogger: ILogger = {
         info: jest.fn(),
         warn: jest.fn(),
-        error: jest.fn()
+        error: jest.fn(),
+        event: jest.fn()
       };
 
       new ObservabilityBuilder()