diff --git a/api/controllers/console/workspace/members.py b/api/controllers/console/workspace/members.py
index 72330aba5f0..b9ed4bf67e2 100644
--- a/api/controllers/console/workspace/members.py
+++ b/api/controllers/console/workspace/members.py
@@ -1,4 +1,5 @@
 from http import HTTPStatus
+from typing import Annotated, Literal
 from urllib import parse
 from uuid import UUID
 
@@ -43,7 +44,7 @@ from services.feature_service import FeatureService
 
 
 class MemberInvitePayload(BaseModel):
-    emails: list[str] = Field(default_factory=list)
+    emails: list[str] = Field(min_length=1)
     role: str
     language: str | None = None
 
@@ -70,11 +71,28 @@ class OwnerTransferPayload(BaseModel):
     token: str
 
 
-class MemberInviteResultResponse(ResponseModel):
-    status: str
+class MemberInviteSuccessResponse(ResponseModel):
+    status: Literal["success"]
     email: str
-    url: str | None = None
-    message: str | None = None
+    url: str
+
+
+class MemberInviteAlreadyMemberResponse(ResponseModel):
+    status: Literal["already_member"]
+    email: str
+    message: str
+
+
+class MemberInviteFailedResponse(ResponseModel):
+    status: Literal["failed"]
+    email: str
+    message: str
+
+
+MemberInviteResultResponse = Annotated[
+    MemberInviteSuccessResponse | MemberInviteAlreadyMemberResponse | MemberInviteFailedResponse,
+    Field(discriminator="status"),
+]
 
 
 class MemberActionResponse(ResponseModel):
@@ -83,7 +101,7 @@ class MemberActionResponse(ResponseModel):
 
 
 class MemberInviteResponse(ResponseModel):
-    result: str
+    result: Literal["success"]
     invitation_results: list[MemberInviteResultResponse]
     tenant_id: str
 
@@ -103,7 +121,9 @@ register_response_schema_models(
     AccountWithRoleListResponse,
     MemberActionResponse,
     MemberInviteResponse,
-    MemberInviteResultResponse,
+    MemberInviteSuccessResponse,
+    MemberInviteAlreadyMemberResponse,
+    MemberInviteFailedResponse,
     SimpleResultDataResponse,
     SimpleResultResponse,
     VerificationTokenResponse,
@@ -279,7 +299,7 @@ class MemberInviteEmailApi(Resource):
                     )
                     encoded_invitee_email = parse.quote(invitee_email)
                     invitation_results.append(
-                        MemberInviteResultResponse(
+                        MemberInviteSuccessResponse(
                             status="success",
                             email=invitee_email,
                             url=f"{console_web_url}/activate?email={encoded_invitee_email}&token={token}",
@@ -287,7 +307,7 @@ class MemberInviteEmailApi(Resource):
                     )
                 except AccountAlreadyInTenantError:
                     invitation_results.append(
-                        MemberInviteResultResponse(
+                        MemberInviteAlreadyMemberResponse(
                             status="already_member",
                             email=invitee_email,
                             message="Account already in workspace.",
@@ -295,14 +315,20 @@ class MemberInviteEmailApi(Resource):
                     )
                 except Exception as e:
                     invitation_results.append(
-                        MemberInviteResultResponse(status="failed", email=invitee_email, message=str(e))
+                        MemberInviteFailedResponse(status="failed", email=invitee_email, message=str(e))
                     )
 
-        return MemberInviteResponse(
-            result="success",
-            invitation_results=invitation_results,
-            tenant_id=inviter.current_tenant.id if inviter.current_tenant else "",
-        ).model_dump(mode="json"), HTTPStatus.CREATED
+        return (
+            dump_response(
+                MemberInviteResponse,
+                {
+                    "result": "success",
+                    "invitation_results": invitation_results,
+                    "tenant_id": inviter.current_tenant.id if inviter.current_tenant else "",
+                },
+            ),
+            HTTPStatus.CREATED,
+        )
 
 
 @console_ns.route("/workspaces/current/members/<uuid:member_id>")
diff --git a/packages/contracts/generated/api/console/workspaces/types.gen.ts b/packages/contracts/generated/api/console/workspaces/types.gen.ts
index 06fccf2e9fb..d94b018f894 100644
--- a/packages/contracts/generated/api/console/workspaces/types.gen.ts
+++ b/packages/contracts/generated/api/console/workspaces/types.gen.ts
@@ -161,14 +161,24 @@ export type EndpointUpdatePayload = {
 }
 
 export type MemberInvitePayload = {
-  emails?: Array<string>
+  emails: Array<string>
   language?: string | null
   role: string
 }
 
 export type MemberInviteResponse = {
-  invitation_results: Array<MemberInviteResultResponse>
-  result: string
+  invitation_results: Array<
+    | ({
+        status: 'success'
+      } & MemberInviteSuccessResponse)
+    | ({
+        status: 'already_member'
+      } & MemberInviteAlreadyMemberResponse)
+    | ({
+        status: 'failed'
+      } & MemberInviteFailedResponse)
+  >
+  result: 'success'
   tenant_id: string
 }
 
@@ -1128,11 +1138,22 @@ export type EndpointListItemResponse = {
   url: string
 }
 
-export type MemberInviteResultResponse = {
+export type MemberInviteSuccessResponse = {
   email: string
-  message?: string | null
-  status: string
-  url?: string | null
+  status: 'success'
+  url: string
+}
+
+export type MemberInviteAlreadyMemberResponse = {
+  email: string
+  message: string
+  status: 'already_member'
+}
+
+export type MemberInviteFailedResponse = {
+  email: string
+  message: string
+  status: 'failed'
 }
 
 export type ProviderResponse = {
diff --git a/packages/contracts/generated/api/console/workspaces/zod.gen.ts b/packages/contracts/generated/api/console/workspaces/zod.gen.ts
index 4c61e8b52b4..098e77d9f19 100644
--- a/packages/contracts/generated/api/console/workspaces/zod.gen.ts
+++ b/packages/contracts/generated/api/console/workspaces/zod.gen.ts
@@ -90,7 +90,7 @@ export const zEndpointUpdatePayload = z.object({
  * MemberInvitePayload
  */
 export const zMemberInvitePayload = z.object({
-  emails: z.array(z.string()).optional(),
+  emails: z.array(z.string()).min(1),
   language: z.string().nullish(),
   role: z.string(),
 })
@@ -816,21 +816,56 @@ export const zAccountWithRoleListResponse = z.object({
 })
 
 /**
- * MemberInviteResultResponse
+ * MemberInviteSuccessResponse
  */
-export const zMemberInviteResultResponse = z.object({
+export const zMemberInviteSuccessResponse = z.object({
   email: z.string(),
-  message: z.string().nullish(),
-  status: z.string(),
-  url: z.string().nullish(),
+  status: z.literal('success'),
+  url: z.string(),
+})
+
+/**
+ * MemberInviteAlreadyMemberResponse
+ */
+export const zMemberInviteAlreadyMemberResponse = z.object({
+  email: z.string(),
+  message: z.string(),
+  status: z.literal('already_member'),
+})
+
+/**
+ * MemberInviteFailedResponse
+ */
+export const zMemberInviteFailedResponse = z.object({
+  email: z.string(),
+  message: z.string(),
+  status: z.literal('failed'),
 })
 
 /**
  * MemberInviteResponse
  */
 export const zMemberInviteResponse = z.object({
-  invitation_results: z.array(zMemberInviteResultResponse),
-  result: z.string(),
+  invitation_results: z.array(
+    z.union([
+      z
+        .object({
+          status: z.literal('success'),
+        })
+        .and(zMemberInviteSuccessResponse),
+      z
+        .object({
+          status: z.literal('already_member'),
+        })
+        .and(zMemberInviteAlreadyMemberResponse),
+      z
+        .object({
+          status: z.literal('failed'),
+        })
+        .and(zMemberInviteFailedResponse),
+    ]),
+  ),
+  result: z.literal('success'),
   tenant_id: z.string(),
 })