diff --git a/flake.nix b/flake.nix
index be6a1db8c..341c5b848 100644
--- a/flake.nix
+++ b/flake.nix
@@ -53,6 +53,8 @@
           ./nixosModules/flake-module.nix
           ./pkgs/flake-module.nix
           ./templates/flake-module.nix
+
+          ./inventory/flake-module.nix
         ];
       }
     );
diff --git a/inventory/.envrc b/inventory/.envrc
new file mode 100644
index 000000000..8d1c6842b
--- /dev/null
+++ b/inventory/.envrc
@@ -0,0 +1,5 @@
+source_up
+
+watch_file flake-module.nix
+
+use flake .#inventory-schema --builders ''
diff --git a/inventory/.vscode/settings.json b/inventory/.vscode/settings.json
new file mode 100644
index 000000000..82a476e34
--- /dev/null
+++ b/inventory/.vscode/settings.json
@@ -0,0 +1,6 @@
+{
+    "cue.toolsPath": "/nix/store/x9471mp522cdi4c9gc8dchvyx6v01b3f-cue-0.8.2/bin/cue",
+    "[cue]": {
+        "editor.formatOnSave": false
+    }
+}
\ No newline at end of file
diff --git a/inventory/README.md b/inventory/README.md
new file mode 100644
index 000000000..318d1bf09
--- /dev/null
+++ b/inventory/README.md
@@ -0,0 +1,57 @@
+# Inventory
+
+This part provides a specification for the inventory.
+
+It is used for design phase and as validation helper.
+
+> Cue is less verbose and easier to understand and maintain than json-schema.
+> Json-schema, if needed can be easily generated on-the fly.
+
+## Checking validity
+
+Directly check a json against the schema
+
+`cue vet inventory.json root.cue -d '#Root'`
+
+## Json schema
+
+Export the json-schema i.e. for usage in python / javascript / nix
+
+`cue export --out openapi root.cue`
+
+## Usage
+
+Comments are rendered as descriptions in the json schema.
+
+```cue
+// A name of the clan (primarily shown by the UI)
+name: string
+```
+
+Cue open sets. In the following `foo = {...}` means that the key `foo` can contain any arbitrary json object.
+
+```cue
+foo: { ... }
+```
+
+Cue dynamic keys.
+
+```cue
+[string]: {
+    attr: string
+}
+```
+
+This is the schema of
+
+```json
+{
+    "a": {
+        "attr": "foo"
+    },
+    "b": {
+        "attr": "bar"
+    }
+    // ... Indefinitely more dynamic keys of type "string"
+}
+```
diff --git a/inventory/example_flake.nix b/inventory/example_flake.nix
new file mode 100644
index 000000000..b6f7fca67
--- /dev/null
+++ b/inventory/example_flake.nix
@@ -0,0 +1,119 @@
+{
+  description = "<Put your description here>";
+
+  inputs.clan-core.url = "https://git.clan.lol/clan/clan-core/archive/main.tar.gz";
+
+  outputs =
+    { clan-core, ... }:
+    let
+      pkgs = clan-core.inputs.nixpkgs.legacyPackages.${system};
+      # Usage see: https://docs.clan.lol
+
+      #  nice_flake_interface -> buildClan() -> inventory -> buildClanFromInventory() -> nixosConfigurations
+
+      system = "x86_64-linux";
+
+      clan =
+        clan-core.lib.buildClanFromInventory [
+          # Inventory 0 (loads the json file managed by the Python API)
+          (builtins.fromJSON (builtins.readFile ./inventory.json))
+          # ->
+          # {
+          #   services."backups_1".autoIncludeMachines = true;
+          #   services."backups_1".module = "borgbackup";
+          #   ... etc.
+          # }
+        ]
+        ++ buildInventory {
+          clanName = "nice_flake_interface";
+          description = "A nice flake interface";
+          icon = "assets/icon.png";
+          machines = {
+            jon = {
+              # Just regular nixos/clan configuration ?
+              # config = {
+              #   imports = [
+              #     ./modules/shared.nix
+              #     ./machines/jon/configuration.nix
+              #   ];
+              #   nixpkgs.hostPlatform = system;
+              #   # Set this for clan commands use ssh i.e. `clan machines update`
+              #   # If you change the hostname, you need to update this line to root@<new-hostname>
+              #   # This only works however if you have avahi running on your admin machine else use IP
+              #   clan.networking.targetHost = pkgs.lib.mkDefault "root@jon";
+              #   # ssh root@flash-installer.local lsblk --output NAME,ID-LINK,FSTYPE,SIZE,MOUNTPOINT
+              #   disko.devices.disk.main = {
+              #     device = "/dev/disk/by-id/__CHANGE_ME__";
+              #   };
+              #   # IMPORTANT! Add your SSH key here
+              #   # e.g. > cat ~/.ssh/id_ed25519.pub
+              #   users.users.root.openssh.authorizedKeys.keys = throw ''
+              #     Don't forget to add your SSH key here!
+              #     users.users.root.openssh.authorizedKeys.keys = [ "<YOUR SSH_KEY>" ]
+              #   '';
+              #   # Zerotier needs one controller to accept new nodes. Once accepted
+              #   # the controller can be offline and routing still works.
+              #   clan.networking.zerotier.controller.enable = true;
+              # };
+            };
+          };
+        }
+        ++ [
+          # Low level inventory overrides (comes at the end)
+          {
+            services."backups_2".autoIncludeMachines = true;
+            services."backups_2".module = "borgbackup";
+          }
+        ];
+
+      /*
+        # Type
+
+        buildInventory :: {
+          clanName :: string
+          machines :: {
+            ${name} :: {
+              config :: {
+                # NixOS configuration
+              };
+            };
+          };
+          # ... More mapped inventory options
+          # i.e. shared config for all machines
+        } -> Inventory
+      */
+      buildInventory =
+        options:
+        let
+          # TODO: Map over machines
+          name = "jon";
+          inventory = {
+            # Set the clan meta
+            meta.name = options.clanName;
+            meta.description = options.description;
+            meta.icon = options.icon;
+            # Declare the services
+            # This "nixos" module simply provides the usual NixOS configuration options.
+            services."nixos".module = "nixos";
+            services."nixos".machineConfig.${name}.config = options.machines.${name}.config;
+
+            # Declare the machines
+            machines.${name} = {
+              name = options.machines.${name}.meta.name;
+              description = options.machines.${name}.meta.description;
+              icon = options.machines.${name}.meta.icon;
+              system = options.machines.${name}.config.nixpkgs.hostPlatform;
+            };
+          };
+        in
+        inventory;
+    in
+    {
+      # all machines managed by Clan
+      inherit (clan) nixosConfigurations clanInternals;
+      # add the Clan cli tool to the dev shell
+      devShells.${system}.default = pkgs.mkShell {
+        packages = [ clan-core.packages.${system}.clan-cli ];
+      };
+    };
+}
diff --git a/inventory/flake-module.nix b/inventory/flake-module.nix
new file mode 100644
index 000000000..4519f8e2e
--- /dev/null
+++ b/inventory/flake-module.nix
@@ -0,0 +1,18 @@
+{ ... }:
+{
+  perSystem =
+    { pkgs, config, ... }:
+    {
+      packages.inventory-schema = pkgs.stdenv.mkDerivation {
+        name = "inventory-schema";
+        src = ./src;
+
+        buildInputs = [ pkgs.cue ];
+
+        installPhase = ''
+          mkdir -p $out
+        '';
+      };
+      devShells.inventory-schema = pkgs.mkShell { inputsFrom = [ config.packages.inventory-schema ]; };
+    };
+}
diff --git a/inventory/inventory.json b/inventory/inventory.json
new file mode 100644
index 000000000..0ee272e7e
--- /dev/null
+++ b/inventory/inventory.json
@@ -0,0 +1,34 @@
+{
+  "meta": {
+    "name": "My clan",
+    "description": "My clan description",
+    "icon": "assets/clan-icon.png"
+  },
+  "services": {
+    "service_ref": {
+      "meta": {
+        "name": "backup"
+      },
+      "autoIncludeMachines": true,
+      "module": "core"
+    }
+  },
+  "machines": {
+    "jon_machine": {
+      "name": "jon_machine",
+      "description": "Jon's machine",
+      "icon": "assets/icon.png",
+      "system": "x86_64-linux"
+    }
+  },
+  "users": {
+    "mic": {
+      "autoInclude": false,
+      "schemas": ["ssh-user"],
+      "config": {
+        "sshKey": "...",
+        "username": "mic92"
+      }
+    }
+  }
+}
diff --git a/inventory/src/cue.mod/module.cue b/inventory/src/cue.mod/module.cue
new file mode 100644
index 000000000..773cae9d3
--- /dev/null
+++ b/inventory/src/cue.mod/module.cue
@@ -0,0 +1,2 @@
+module: "clan.lol/inventory"
+language: version: "v0.8.2"
\ No newline at end of file
diff --git a/inventory/src/machines/machines.cue b/inventory/src/machines/machines.cue
new file mode 100644
index 000000000..36d77e378
--- /dev/null
+++ b/inventory/src/machines/machines.cue
@@ -0,0 +1,8 @@
+package machines
+
+#machine: machines: [string]: {
+    "name": string,
+    "description": string,
+    "icon": string,
+    "system": string
+}
\ No newline at end of file
diff --git a/inventory/src/root.cue b/inventory/src/root.cue
new file mode 100644
index 000000000..c3b7496a4
--- /dev/null
+++ b/inventory/src/root.cue
@@ -0,0 +1,28 @@
+package inventory
+
+import (
+	"clan.lol/inventory/services"
+	"clan.lol/inventory/machines"
+	"clan.lol/inventory/users"
+)
+
+@jsonschema(schema="http://json-schema.org/schema#")
+#Root: {
+	meta: {
+		// A name of the clan (primarily shown by the UI)
+		name: string
+		// A description of the clan
+		description: string
+		// The icon path
+		icon: string
+	}
+
+	// A map of services
+	services.#service
+
+	// A map of machines
+	machines.#machine
+
+	// A map of users
+	users.#user
+}
diff --git a/inventory/src/services/services.cue b/inventory/src/services/services.cue
new file mode 100644
index 000000000..c24ef69f4
--- /dev/null
+++ b/inventory/src/services/services.cue
@@ -0,0 +1,21 @@
+package services
+
+#service: services: [string]: {
+    autoIncludeMachines: bool,
+    meta: {
+        name: string,
+    },
+    // TODO: this should be the list of avilable modules
+    module: string,
+    machineConfig: {
+        [string]: {
+            config: {
+                defaultUser?: string
+            }
+        }
+    },
+    globalConfig: {
+        // Should be one of the avilable users
+        defaultUser?: string,
+    }
+}
\ No newline at end of file
diff --git a/inventory/src/users/users.cue b/inventory/src/users/users.cue
new file mode 100644
index 000000000..bdd54067d
--- /dev/null
+++ b/inventory/src/users/users.cue
@@ -0,0 +1,9 @@
+package users
+
+#user: users: [string]: {
+   "autoInclude": bool,
+   "schemas": [ string ],
+   "config": {
+        ...
+    }
+}
\ No newline at end of file