diff --git a/schemas/agentcore.schema.v1.json b/schemas/agentcore.schema.v1.json
index 9da99933..04546e39 100644
--- a/schemas/agentcore.schema.v1.json
+++ b/schemas/agentcore.schema.v1.json
@@ -141,6 +141,10 @@
               "type": "string"
             }
           },
+          "executionRoleArn": {
+            "description": "ARN of an existing IAM execution role to use instead of creating a new one.",
+            "type": "string"
+          },
           "authorizerType": {
             "type": "string",
             "enum": ["AWS_IAM", "CUSTOM_JWT"]