diff --git a/libs/typescript/agent/src/types.ts b/libs/typescript/agent/src/types.ts
index 48a4bc3d..9d5a7b8d 100644
--- a/libs/typescript/agent/src/types.ts
+++ b/libs/typescript/agent/src/types.ts
@@ -47,7 +47,9 @@ export type AgentMessage =
   | AssistantMessage
   | ReasoningMessage
   | ComputerCallMessage
-  | ComputerCallOutputMessage;
+  | ComputerCallOutputMessage
+  | FunctionCallMesssage
+  | FunctionCallOutputMessage;
 // Input message
 export interface UserMessage {
   type?: 'message';
@@ -78,6 +80,20 @@ export interface ComputerCallOutputMessage {
   call_id: string;
   output: ComputerResultContent;
 }
+// Output function call
+export interface FunctionCallMessage {
+  type: 'function_call';
+  call_id: string;
+  status: 'completed' | 'failed' | 'pending';
+  name: string;
+  arguments: string; // JSON dict of kwargs
+}
+// Output function call result (always text)
+export interface FunctionCallOutputMessage {
+  type: 'function_call_output';
+  call_id: string;
+  output: string;
+}
 // #endregion