diff --git a/vertexai/_genai/_agent_engines_utils.py b/vertexai/_genai/_agent_engines_utils.py
index ba388f4d38..fc4fa850bc 100644
--- a/vertexai/_genai/_agent_engines_utils.py
+++ b/vertexai/_genai/_agent_engines_utils.py
@@ -152,6 +152,7 @@
         "ag2",
         "llama-index",
         "custom",
+        "a2a",
     ]
 )
 _DEFAULT_ASYNC_METHOD_NAME = "async_query"
diff --git a/vertexai/preview/reasoning_engines/templates/a2a.py b/vertexai/preview/reasoning_engines/templates/a2a.py
index 724e2af41e..fec888f610 100644
--- a/vertexai/preview/reasoning_engines/templates/a2a.py
+++ b/vertexai/preview/reasoning_engines/templates/a2a.py
@@ -165,6 +165,8 @@ async def cancel(
 class A2aAgent:
     """A class to initialize and set up an Agent-to-Agent application."""
 
+    agent_framework = "a2a"
+
     # TODO: Add instrumentation for the A2A agent.
     def __init__(
         self,