diff --git a/apps/web/src/components/NewWorkspaceForm.tsx b/apps/web/src/components/NewWorkspaceForm.tsx
index a2422099..ed7e70ac 100644
--- a/apps/web/src/components/NewWorkspaceForm.tsx
+++ b/apps/web/src/components/NewWorkspaceForm.tsx
@@ -96,6 +96,7 @@ export function NewWorkspaceForm() {
           description: values.description,
           slug: values.slug,
           plan: values.plan,
+          cardPrefix: values.cardPrefix,
           role: "admin",
           weekStartDay: 1,
         });
diff --git a/packages/api/src/routers/workspace.ts b/packages/api/src/routers/workspace.ts
index a6453f57..ca179c33 100644
--- a/packages/api/src/routers/workspace.ts
+++ b/packages/api/src/routers/workspace.ts
@@ -276,6 +276,7 @@ export const workspaceRouter = createTRPCRouter({
         slug: result.slug!,
         description: result.description ?? null,
         plan: result.plan!,
+        cardPrefix: result.cardPrefix!,
       };
     }),
   update: protectedProcedure
diff --git a/packages/api/src/schemas/board.ts b/packages/api/src/schemas/board.ts
index 5327087e..937568da 100644
--- a/packages/api/src/schemas/board.ts
+++ b/packages/api/src/schemas/board.ts
@@ -39,6 +39,7 @@ const boardDetailCardSchema = z.object({
   title: z.string(),
   description: z.string().nullable(),
   index: z.number(),
+  cardNumber: z.number().nullable(),
   dueDate: z.date().nullable(),
   labels: z.array(labelSchema),
   members: z.array(boardCardMemberSchema),
@@ -57,6 +58,7 @@ export const boardDetailSchema = z.object({
   favorite: z.boolean(),
   workspace: z.object({
     publicId: z.string(),
+    cardPrefix: z.string(),
     members: z.array(workspaceMemberSchema),
   }),
   labels: z.array(labelSchema),
diff --git a/packages/api/src/schemas/card.ts b/packages/api/src/schemas/card.ts
index 2a13b28c..5569bfe7 100644
--- a/packages/api/src/schemas/card.ts
+++ b/packages/api/src/schemas/card.ts
@@ -46,6 +46,7 @@ export const cardDetailSchema = z.object({
   publicId: z.string(),
   title: z.string(),
   description: z.string().nullable(),
+  cardNumber: z.number().nullable(),
   dueDate: z.date().nullable(),
   createdBy: z.string().nullable(),
   labels: z.array(labelSchema),
@@ -75,6 +76,7 @@ export const cardDetailSchema = z.object({
       ),
       workspace: z.object({
         publicId: z.string(),
+        cardPrefix: z.string(),
         members: z.array(workspaceMemberSchema),
       }),
     }),
diff --git a/packages/api/src/schemas/workspace.ts b/packages/api/src/schemas/workspace.ts
index 3cec9de5..b59a74c2 100644
--- a/packages/api/src/schemas/workspace.ts
+++ b/packages/api/src/schemas/workspace.ts
@@ -12,6 +12,7 @@ export const workspaceListItemSchema = z.object({
     slug: z.string(),
     plan: z.enum(["free", "team", "pro", "enterprise"]),
     weekStartDay: z.number().nullable(),
+    cardPrefix: z.string(),
     deletedAt: z.date().nullable(),
   }),
 });
@@ -74,6 +75,7 @@ export const workspaceCreateResponseSchema = z.object({
   slug: z.string(),
   description: z.string().nullable(),
   plan: z.enum(["free", "team", "pro", "enterprise"]),
+  cardPrefix: z.string(),
 });
 
 // ─── workspace.update ────────────────────────────────────────
diff --git a/packages/db/src/repository/workspace.repo.ts b/packages/db/src/repository/workspace.repo.ts
index c5d3620a..fd48a897 100644
--- a/packages/db/src/repository/workspace.repo.ts
+++ b/packages/db/src/repository/workspace.repo.ts
@@ -93,6 +93,7 @@ export const create = async (
       slug: workspaces.slug,
       description: workspaces.description,
       plan: workspaces.plan,
+      cardPrefix: workspaces.cardPrefix,
     });
 
   if (workspace) {