diff --git a/crates/client/src/backend_workspace.rs b/crates/client/src/backend_workspace.rs
index a1f093d4..244025ca 100644
--- a/crates/client/src/backend_workspace.rs
+++ b/crates/client/src/backend_workspace.rs
@@ -2,7 +2,10 @@ use crate::{BackendApiClient, BackendApiClientError};
 use reqwest::Method;
 use serde::{Deserialize, Serialize};
 use std::fmt;
-use workspace_api::{WorkspaceCreateResponse, WorkspaceRepositoryRecord, WorkspaceSummary};
+use workspace_api::{
+    WorkspaceCatalogListResponse, WorkspaceCreateResponse, WorkspaceRepositoryRecord,
+    WorkspaceSummary,
+};
 
 const DEFAULT_WORKSPACE_LIMIT: usize = 200;
 
@@ -88,7 +91,7 @@ async fn list_backend_workspaces_with_client(
         .send()
         .await?;
     client.check_status(response.status())?;
-    Ok(response.json::<Vec<BackendWorkspace>>().await?)
+    Ok(response.json::<WorkspaceCatalogListResponse>().await?.0)
 }
 
 pub async fn create_backend_workspace(
diff --git a/crates/workspace-api/src/lib.rs b/crates/workspace-api/src/lib.rs
index fcbb299a..524e8680 100644
--- a/crates/workspace-api/src/lib.rs
+++ b/crates/workspace-api/src/lib.rs
@@ -105,6 +105,14 @@ pub struct WorkspaceSummary {
     pub updated_at: String,
 }
 
+/// Public response returned by `GET /api/workspaces`.
+///
+/// The transparent newtype keeps the established top-level JSON array while making the
+/// complete list response a named cross-crate and generated-TypeScript authority.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
+pub struct WorkspaceCatalogListResponse(pub Vec<WorkspaceSummary>);
+
 /// Public Repository record embedded in Workspace creation responses.
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 #[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
@@ -754,6 +762,7 @@ pub fn catalog_typescript() -> String {
     let config = ts_rs::Config::default();
     let declarations = [
         WorkspaceSummary::decl(&config),
+        WorkspaceCatalogListResponse::decl(&config),
         WorkspaceRepositoryRecord::decl(&config),
         WorkspaceCreateResponse::decl(&config),
         WorkspaceAuthConfig::decl(&config),
@@ -814,6 +823,17 @@ mod tests {
         let parsed: WorkspaceResponse = serde_json::from_value(workspace.clone()).unwrap();
         assert_eq!(serde_json::to_value(parsed).unwrap(), workspace);
 
+        let catalog = serde_json::json!([{
+            "workspace_id": "workspace-test",
+            "owner_account_id": "user-test",
+            "display_name": "Test",
+            "state": "active",
+            "created_at": "2026-01-01T00:00:00Z",
+            "updated_at": "2026-01-01T00:00:00Z"
+        }]);
+        let parsed: WorkspaceCatalogListResponse = serde_json::from_value(catalog.clone()).unwrap();
+        assert_eq!(serde_json::to_value(parsed).unwrap(), catalog);
+
         let repositories = serde_json::json!({
             "workspace_id": "workspace-test",
             "items": [{
@@ -860,6 +880,9 @@ mod tests {
     #[test]
     fn generated_catalog_typescript_keeps_public_wrappers_and_nullability() {
         let output = catalog_typescript();
+        assert!(
+            output.contains("export type WorkspaceCatalogListResponse = Array<WorkspaceSummary>")
+        );
         assert!(output.contains("export type WorkspaceResponse ="));
         assert!(output.contains("permissions: WorkspacePermissionSummary"));
         assert!(output.contains("export type RepositoryListResponse ="));
diff --git a/crates/workspace-server/src/server.rs b/crates/workspace-server/src/server.rs
index a2ae339a..9bdc867b 100644
--- a/crates/workspace-server/src/server.rs
+++ b/crates/workspace-server/src/server.rs
@@ -67,10 +67,10 @@ use workspace_api::{
     RepositoryDetailResponse, RepositoryListResponse, RepositoryLogResponse,
     RepositorySshCredential, RepositorySshHostTrust, RotateRepositorySshCredentialRequest,
     RuntimeConnectionTestResponse, RuntimeManagementSummary, TICKET_ORCHESTRATION_PLANS_QUERY_PATH,
-    TICKET_RELATIONS_QUERY_PATH, WorkspaceCreateResponse, WorkspaceExtensionPointState,
-    WorkspaceExtensionPoints, WorkspacePermissionSummary, WorkspaceRepositoryRecord,
-    WorkspaceResponse, WorkspaceRuntimeResource, WorkspaceSummary, WorkspaceWorkerDiscoveryItem,
-    WorkspaceWorkerDiscoveryPage, WorkspaceWorkerSubject,
+    TICKET_RELATIONS_QUERY_PATH, WorkspaceCatalogListResponse, WorkspaceCreateResponse,
+    WorkspaceExtensionPointState, WorkspaceExtensionPoints, WorkspacePermissionSummary,
+    WorkspaceRepositoryRecord, WorkspaceResponse, WorkspaceRuntimeResource, WorkspaceSummary,
+    WorkspaceWorkerDiscoveryItem, WorkspaceWorkerDiscoveryPage, WorkspaceWorkerSubject,
 };
 
 use crate::auth::{
@@ -980,7 +980,9 @@ async fn list_server_workspaces(
     let owner = match resolve_server_actor(&api, &headers).await {
         Ok(Some(actor)) => Some(actor.account_id),
         Ok(None) => match api.catalog.is_empty() {
-            Ok(true) => return Json(Vec::<WorkspaceSummary>::new()).into_response(),
+            Ok(true) => {
+                return Json(WorkspaceCatalogListResponse(Vec::new())).into_response();
+            }
             Ok(false) => return StatusCode::UNAUTHORIZED.into_response(),
             Err(error) => return server_error_response(error),
         },
@@ -990,12 +992,9 @@ async fn list_server_workspaces(
         .catalog
         .list(owner.as_deref(), query.limit.unwrap_or(100))
     {
-        Ok(workspaces) => Json(
-            workspaces
-                .into_iter()
-                .map(workspace_summary)
-                .collect::<Vec<_>>(),
-        )
+        Ok(workspaces) => Json(WorkspaceCatalogListResponse(
+            workspaces.into_iter().map(workspace_summary).collect(),
+        ))
         .into_response(),
         Err(error) => server_error_response(error),
     }
@@ -17784,10 +17783,10 @@ mod tests {
         let catalog_body = to_bytes(authenticated_catalog.into_body(), usize::MAX)
             .await
             .unwrap();
-        let typed_catalog: Vec<workspace_api::WorkspaceSummary> =
+        let typed_catalog: workspace_api::WorkspaceCatalogListResponse =
             serde_json::from_slice(&catalog_body).unwrap();
         assert_eq!(
-            typed_catalog[0].workspace_id,
+            typed_catalog.0[0].workspace_id,
             workspace.workspace.workspace_id
         );
 
diff --git a/web/workspace/src/lib/generated/workspace-api.ts b/web/workspace/src/lib/generated/workspace-api.ts
index ebed5766..d753ca65 100644
--- a/web/workspace/src/lib/generated/workspace-api.ts
+++ b/web/workspace/src/lib/generated/workspace-api.ts
@@ -10,6 +10,8 @@ export type WorkspaceSummary = {
   updated_at: string;
 };
 
+export type WorkspaceCatalogListResponse = Array<WorkspaceSummary>;
+
 export type WorkspaceRepositoryRecord = {
   workspace_id: string;
   repository_id: string;
diff --git a/web/workspace/src/lib/workspace/api/workspace-model.ts b/web/workspace/src/lib/workspace/api/workspace-model.ts
index a915f17e..11317781 100644
--- a/web/workspace/src/lib/workspace/api/workspace-model.ts
+++ b/web/workspace/src/lib/workspace/api/workspace-model.ts
@@ -11,6 +11,7 @@ import type {
   RepositorySourceKind,
   RepositorySummary,
   WorkspaceAuthConfig,
+  WorkspaceCatalogListResponse,
   WorkspaceCreateResponse,
   WorkspaceExtensionPoints,
   WorkspaceExtensionPointState,
@@ -28,6 +29,7 @@ export type {
   RepositoryListResponse,
   RepositoryLogResponse,
   RepositorySummary,
+  WorkspaceCatalogListResponse,
   WorkspaceCreateResponse,
   WorkspacePermissionSummary,
   WorkspaceResponse,
@@ -412,7 +414,7 @@ function commitSummary(value: unknown, path: string): GitCommitSummary {
 
 export function parseWorkspaceCatalogResponse(
   value: unknown,
-): WorkspaceSummary[] {
+): WorkspaceCatalogListResponse {
   return array(value, "workspaces").map((item, index) =>
     workspaceSummary(item, `workspaces[${index}]`)
   );