diff --git a/AGENTS.md b/AGENTS.md
index b163b8e..f283c1d 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -368,6 +368,7 @@ modules/profiles/
 │   └── vm/
 ├── workload/
 │   ├── camera/
+│   ├── deploy-rs-target/
 │   ├── development/
 │   ├── game/
 │   ├── machine-learning/
diff --git a/hosts/nix-builder/nixos.nix b/hosts/nix-builder/nixos.nix
index 801bc3e..80217ba 100644
--- a/hosts/nix-builder/nixos.nix
+++ b/hosts/nix-builder/nixos.nix
@@ -2,5 +2,6 @@
   imports = [
     ./disko.nix
     ./hardware-configuration.nix
+    ./harmonia.nix
   ];
 }
diff --git a/modules/profiles/README.md b/modules/profiles/README.md
index b06e023..0529f9c 100644
--- a/modules/profiles/README.md
+++ b/modules/profiles/README.md
@@ -36,6 +36,7 @@ required on every supported host.
 | `platform.laptop`                    | Physical NixOS laptop                         |
 | `platform.thinkpad-x1`               | Intel ThinkPad X1 running NixOS               |
 | `platform.vm`                        | UEFI QEMU NixOS guest with NFS client support |
+| `workload.deploy-rs-target`          | NixOS                                         |
 | `workload.development`               | NixOS, macOS with Home Manager                |
 | `workload.game`                      | NixOS, macOS                                  |
 | `workload.machine-learning`          | NixOS with Home Manager                       |
@@ -63,6 +64,10 @@ support does not implicitly select an interface or workload.
 `workload.machine-learning` provides the Hugging Face Hub CLI for hosts used
 to download and publish machine learning models and datasets.
 
+`workload.deploy-rs-target` enables OpenSSH and provisions the `nixdeploy`
+service account with the narrowly scoped passwordless commands required for
+deploy-rs activation and rollback confirmation.
+
 `workload.personal` provides Pear Desktop on both NixOS and macOS. Home Manager
 enables performance improvements, synced lyrics, tracker blocking, the album
 color theme, and custom output-device selection while preserving user-owned
diff --git a/modules/systems/nix/common.nix b/modules/systems/nix/common.nix
index 885b83a..8f1bdbd 100644
--- a/modules/systems/nix/common.nix
+++ b/modules/systems/nix/common.nix
@@ -7,6 +7,10 @@
       "flakes"
     ];
 
+    extra-allowed-users = [
+      "nixdeploy"
+    ];
+
     connect-timeout = 10;
 
     extra-substituters = [
@@ -31,6 +35,7 @@
       "niks3.numtide.com-1:DTx8wZduET09hRmMtKdQDxNNthLQETkc/yaX7M4qK0g="
       "codex-desktop-linux.cachix.org-1:nX/xy6AdK9hQE24A8ALGjkCKj2ObFmcnemiL5Cid4nk="
       "cuda-maintainers.cachix.org-1:0dq3bujKpuEPMCX6U4WylrUDZ9JyUG0VpVZa7CNfq5E="
+      "nix-builder-1:nix-builder-1:aG/Y2Lac517isxGO+ZYdVgglj/SI54PkkWoZTQI9aOI="
     ];
   };
 }