diff --git a/backend/src/native/workspace-fs-at-binding.d.ts b/backend/src/native/workspace-fs-at-binding.d.ts
index b515f825..e3699bcc 100644
--- a/backend/src/native/workspace-fs-at-binding.d.ts
+++ b/backend/src/native/workspace-fs-at-binding.d.ts
@@ -3,5 +3,6 @@ declare const nativeWorkspaceFsAtComponentBrand: unique symbol;
 export interface NativeWorkspaceFsAtHandleV1 { readonly [nativeWorkspaceFsAtHandleBrand]: true; }
 export type NativeWorkspaceFsAtComponentV1 = string & { readonly [nativeWorkspaceFsAtComponentBrand]: true };
 export interface NativeWorkspaceFsAtStatV1 { readonly device: bigint; readonly inode: bigint; readonly mode: number; readonly uid: number; readonly gid: number; readonly nlink: bigint; }
+export interface NativeWorkspaceFsAtErrorV1 extends Error { readonly code:string; readonly errno:number; readonly syscall:"openat"|"mkdirat"|"fstat"|"fstatat"|"fsync"|"fcntl"|"close"; }
 export interface NativeWorkspaceFsAtOpenResultV1 { readonly handle: NativeWorkspaceFsAtHandleV1; readonly openedStat: NativeWorkspaceFsAtStatV1; }
 export interface WorkspaceFsAtBindingV1 { openat(input: { readonly parent: NativeWorkspaceFsAtHandleV1|null; readonly name: "/"|NativeWorkspaceFsAtComponentV1; readonly kind: "directory"|"regular_lock"; readonly createMode: 0|0o600 }): NativeWorkspaceFsAtOpenResultV1; mkdirat(parent: NativeWorkspaceFsAtHandleV1,name:NativeWorkspaceFsAtComponentV1,mode:0o700):void; fstatat(parent:NativeWorkspaceFsAtHandleV1,name:NativeWorkspaceFsAtComponentV1):NativeWorkspaceFsAtStatV1; fsyncDirectory(handle:NativeWorkspaceFsAtHandleV1):void; close(handle:NativeWorkspaceFsAtHandleV1):void; fdNumberForSynchronousBorrow(handle:NativeWorkspaceFsAtHandleV1):number; }