diff --git a/lib/inventory/build-inventory/default.nix b/lib/inventory/build-inventory/default.nix
index 88b952d5e..63f5e7678 100644
--- a/lib/inventory/build-inventory/default.nix
+++ b/lib/inventory/build-inventory/default.nix
@@ -28,10 +28,10 @@ let
             );
           in
           if tagMembers == [ ] then
-            throw ''
+            lib.warn ''
               inventory.services.${serviceName}.${instanceName}: - ${roleName} tags: no machine with tag '${tag}' found.
               Available tags: ${builtins.toJSON (lib.unique availableTags)}
-            ''
+            '' [ ]
           else
             acc ++ tagMembers
         ) [ ] members.tags or [ ]);
diff --git a/lib/inventory/flake-module.nix b/lib/inventory/flake-module.nix
index e356a27d4..e6b834676 100644
--- a/lib/inventory/flake-module.nix
+++ b/lib/inventory/flake-module.nix
@@ -42,7 +42,7 @@ in
       checks = {
         lib-inventory-eval = pkgs.runCommand "tests" { nativeBuildInputs = [ pkgs.nix-unit ]; } ''
           export HOME="$(realpath .)"
-
+          export NIX_ABORT_ON_WARN=1
           nix-unit --eval-store "$HOME" \
             --extra-experimental-features flakes \
             ${inputOverrides} \
diff --git a/lib/inventory/tests/default.nix b/lib/inventory/tests/default.nix
index 1a7b51be2..182069e4a 100644
--- a/lib/inventory/tests/default.nix
+++ b/lib/inventory/tests/default.nix
@@ -178,6 +178,8 @@ in
         msg = "Roles roleXYZ are not defined in the service borgbackup.";
       };
     };
+  # Needs NIX_ABORT_ON_WARN=1
+  # So the lib.warn is turned into abort
   test_inventory_tag_doesnt_exist =
     let
       configs = buildInventory {
@@ -201,8 +203,9 @@ in
     {
       expr = configs;
       expectedError = {
-        type = "ThrownError";
-        msg = "no machine with tag '\\w+' found";
+        type = "Error";
+        # TODO: Add warning matching in nix-unit
+        msg = ".*";
       };
     };
   test_inventory_disabled_service =
diff --git a/lib/values/flake-module.nix b/lib/values/flake-module.nix
index db60f92c5..9d997ccc6 100644
--- a/lib/values/flake-module.nix
+++ b/lib/values/flake-module.nix
@@ -6,8 +6,17 @@ let
 in
 {
   perSystem =
-    { pkgs, system, ... }:
     {
+      pkgs,
+      system,
+      lib,
+      ...
+    }:
+    let
+      tests = import ./test.nix { inherit lib; };
+    in
+    {
+      legacyPackages.evalTests-values = tests;
       checks = {
         lib-values-eval = pkgs.runCommand "tests" { nativeBuildInputs = [ pkgs.nix-unit ]; } ''
           export HOME="$(realpath .)"
@@ -15,7 +24,7 @@ in
           nix-unit --eval-store "$HOME" \
             --extra-experimental-features flakes \
             ${inputOverrides} \
-            --flake ${self}#legacyPackages.${system}.evalTests-inventory
+            --flake ${self}#legacyPackages.${system}.evalTests-values
 
           touch $out
         '';
diff --git a/pkgs/clan-app/clan_app/deps/webview/webview.py b/pkgs/clan-app/clan_app/deps/webview/webview.py
index 9aa4a16cf..f422066eb 100644
--- a/pkgs/clan-app/clan_app/deps/webview/webview.py
+++ b/pkgs/clan-app/clan_app/deps/webview/webview.py
@@ -82,43 +82,47 @@ class Webview:
                 method_name: str = name,
             ) -> None:
                 def thread_task() -> None:
-                    args = json.loads(req.decode())
-
                     try:
-                        log.debug(f"Calling {method_name}({args[0]})")
-                        # Initialize dataclasses from the payload
-                        reconciled_arguments = {}
-                        for k, v in args[0].items():
-                            # Some functions expect to be called with dataclass instances
-                            # But the js api returns dictionaries.
-                            # Introspect the function and create the expected dataclass from dict dynamically
-                            # Depending on the introspected argument_type
-                            arg_class = api.get_method_argtype(method_name, k)
+                        args = json.loads(req.decode())
 
-                            # TODO: rename from_dict into something like construct_checked_value
-                            # from_dict really takes Anything and returns an instance of the type/class
-                            reconciled_arguments[k] = from_dict(arg_class, v)
+                        try:
+                            log.debug(f"Calling {method_name}({args[0]})")
+                            # Initialize dataclasses from the payload
+                            reconciled_arguments = {}
+                            for k, v in args[0].items():
+                                # Some functions expect to be called with dataclass instances
+                                # But the js api returns dictionaries.
+                                # Introspect the function and create the expected dataclass from dict dynamically
+                                # Depending on the introspected argument_type
+                                arg_class = api.get_method_argtype(method_name, k)
 
-                        reconciled_arguments["op_key"] = seq.decode()
-                        # TODO: We could remove the wrapper in the MethodRegistry
-                        # and just call the method directly
-                        result = wrap_method(**reconciled_arguments)
-                        success = True
+                                # TODO: rename from_dict into something like construct_checked_value
+                                # from_dict really takes Anything and returns an instance of the type/class
+                                reconciled_arguments[k] = from_dict(arg_class, v)
+
+                            reconciled_arguments["op_key"] = seq.decode()
+                            # TODO: We could remove the wrapper in the MethodRegistry
+                            # and just call the method directly
+                            result = wrap_method(**reconciled_arguments)
+                            success = True
+                        except Exception as e:
+                            log.exception(f"Error calling {method_name}")
+                            result = str(e)
+                            success = False
+
+                        try:
+                            serialized = json.dumps(
+                                dataclass_to_dict(result), indent=4, ensure_ascii=False
+                            )
+                        except TypeError:
+                            log.exception(f"Error serializing result for {method_name}")
+                            raise
+
+                        log.debug(f"Result for {method_name}: {serialized}")
+                        self.return_(seq.decode(), 0 if success else 1, serialized)
                     except Exception as e:
-                        log.exception(f"Error calling {method_name}")
-                        result = str(e)
-                        success = False
-
-                    try:
-                        serialized = json.dumps(
-                            dataclass_to_dict(result), indent=4, ensure_ascii=False
-                        )
-                    except TypeError:
-                        log.exception(f"Error serializing result for {method_name}")
-                        raise
-
-                    log.debug(f"Result for {method_name}: {serialized}")
-                    self.return_(seq.decode(), 0 if success else 1, serialized)
+                        log.exception(f"Unhandled error in webview {method_name}")
+                        self.return_(seq.decode(), 1, str(e))
 
                 thread = threading.Thread(target=thread_task)
                 thread.start()
diff --git a/pkgs/clan-cli/clan_cli/vars/generate.py b/pkgs/clan-cli/clan_cli/vars/generate.py
index 3cb35f51a..6fb4c8241 100644
--- a/pkgs/clan-cli/clan_cli/vars/generate.py
+++ b/pkgs/clan-cli/clan_cli/vars/generate.py
@@ -260,7 +260,11 @@ def _ask_prompts(
     prompt_values: dict[str, str] = {}
     for prompt in generator.prompts:
         var_id = f"{generator.name}/{prompt.name}"
-        prompt_values[prompt.name] = ask(var_id, prompt.prompt_type)
+        prompt_values[prompt.name] = ask(
+            var_id,
+            prompt.prompt_type,
+            prompt.description if prompt.description != prompt.name else None,
+        )
     return prompt_values
 
 
diff --git a/pkgs/clan-cli/clan_cli/vars/get.py b/pkgs/clan-cli/clan_cli/vars/get.py
index 5e975c550..335143772 100644
--- a/pkgs/clan-cli/clan_cli/vars/get.py
+++ b/pkgs/clan-cli/clan_cli/vars/get.py
@@ -2,10 +2,10 @@ import argparse
 import logging
 import sys
 
+from clan_cli.api import API
 from clan_cli.clan_uri import FlakeId
 from clan_cli.completions import add_dynamic_completer, complete_machines
 from clan_cli.errors import ClanError
-from clan_cli.machines.machines import Machine
 
 from .generate import Var
 from .list import get_vars
@@ -13,8 +13,9 @@ from .list import get_vars
 log = logging.getLogger(__name__)
 
 
-def get_var(machine: Machine, var_id: str) -> Var:
-    vars_ = get_vars(machine)
+@API.register
+def get_var(base_dir: str, machine_name: str, var_id: str) -> Var:
+    vars_ = get_vars(base_dir=base_dir, machine_name=machine_name)
     results = []
     for var in vars_:
         if var.id == var_id:
@@ -42,8 +43,7 @@ def get_var(machine: Machine, var_id: str) -> Var:
 
 
 def get_command(machine_name: str, var_id: str, flake: FlakeId) -> None:
-    machine = Machine(name=machine_name, flake=flake)
-    var = get_var(machine, var_id)
+    var = get_var(str(flake.path), machine_name, var_id)
     if not var.exists:
         msg = f"Var {var.id} has not been generated yet"
         raise ClanError(msg)
diff --git a/pkgs/clan-cli/clan_cli/vars/list.py b/pkgs/clan-cli/clan_cli/vars/list.py
index 5a7b7d401..c82a6a032 100644
--- a/pkgs/clan-cli/clan_cli/vars/list.py
+++ b/pkgs/clan-cli/clan_cli/vars/list.py
@@ -25,7 +25,9 @@ def secret_store(machine: Machine) -> StoreBase:
     return secret_vars_module.SecretStore(machine=machine)
 
 
-def get_vars(machine: Machine) -> list[Var]:
+@API.register
+def get_vars(base_dir: str, machine_name: str) -> list[Var]:
+    machine = Machine(name=machine_name, flake=FlakeId(base_dir))
     pub_store = public_store(machine)
     sec_store = secret_store(machine)
     all_vars = []
@@ -58,7 +60,7 @@ def _get_previous_value(
 
 
 @API.register
-def get_prompts(base_dir: str, machine_name: str) -> list[Generator]:
+def get_generators(base_dir: str, machine_name: str) -> list[Generator]:
     machine = Machine(name=machine_name, flake=FlakeId(base_dir))
     generators: list[Generator] = machine.vars_generators
     for generator in generators:
@@ -96,7 +98,7 @@ def stringify_vars(_vars: list[Var]) -> str:
 
 
 def stringify_all_vars(machine: Machine) -> str:
-    return stringify_vars(get_vars(machine))
+    return stringify_vars(get_vars(str(machine.flake), machine.name))
 
 
 def list_command(args: argparse.Namespace) -> None:
diff --git a/pkgs/clan-cli/clan_cli/vars/prompt.py b/pkgs/clan-cli/clan_cli/vars/prompt.py
index 629dba747..bc4bba156 100644
--- a/pkgs/clan-cli/clan_cli/vars/prompt.py
+++ b/pkgs/clan-cli/clan_cli/vars/prompt.py
@@ -37,16 +37,25 @@ class Prompt:
         )
 
 
-def ask(description: str, input_type: PromptType) -> str:
+def ask(
+    ident: str,
+    input_type: PromptType,
+    label: str | None,
+) -> str:
+    text = f"Enter the value for {ident}:"
+    if label:
+        text = f"{label}"
+
     if MOCK_PROMPT_RESPONSE:
         return next(MOCK_PROMPT_RESPONSE)
     match input_type:
         case PromptType.LINE:
-            result = input(f"Enter the value for {description}: ")
+            result = input(f"{text}: ")
         case PromptType.MULTILINE:
-            print(f"Enter the value for {description} (Finish with Ctrl-D): ")
+            print(f"{text} (Finish with Ctrl-D): ")
             result = sys.stdin.read()
         case PromptType.HIDDEN:
-            result = getpass(f"Enter the value for {description} (hidden): ")
+            result = getpass(f"{text} (hidden): ")
+
     log.info("Input received. Processing...")
     return result
diff --git a/pkgs/clan-cli/clan_cli/vars/set.py b/pkgs/clan-cli/clan_cli/vars/set.py
index b6f51337a..dc5ace98e 100644
--- a/pkgs/clan-cli/clan_cli/vars/set.py
+++ b/pkgs/clan-cli/clan_cli/vars/set.py
@@ -23,7 +23,7 @@ def set_var(
     else:
         _machine = machine
     if isinstance(var, str):
-        _var = get_var(_machine, var)
+        _var = get_var(str(flake.path), _machine.name, var)
     else:
         _var = var
     path = _var.set(value)
@@ -36,12 +36,17 @@ def set_var(
 
 
 def set_via_stdin(machine: str, var_id: str, flake: FlakeId) -> None:
-    _machine = Machine(name=machine, flake=flake)
-    var = get_var(_machine, var_id)
+    var = get_var(str(flake.path), machine, var_id)
     if sys.stdin.isatty():
-        new_value = ask(var.id, PromptType.HIDDEN).encode("utf-8")
+        new_value = ask(
+            var.id,
+            PromptType.HIDDEN,
+            None,
+        ).encode("utf-8")
     else:
         new_value = sys.stdin.buffer.read()
+
+    _machine = Machine(name=machine, flake=flake)
     set_var(_machine, var, new_value, flake)
 
 
diff --git a/pkgs/clan-cli/tests/test_vars.py b/pkgs/clan-cli/tests/test_vars.py
index c7aee65ed..57273390b 100644
--- a/pkgs/clan-cli/tests/test_vars.py
+++ b/pkgs/clan-cli/tests/test_vars.py
@@ -170,9 +170,16 @@ def test_generate_public_and_secret_vars(
         "Update vars via generator my_shared_generator for machine my_machine"
         in commit_message
     )
-    assert get_var(machine, "my_generator/my_value").printable_value == "public"
     assert (
-        get_var(machine, "my_shared_generator/my_shared_value").printable_value
+        get_var(
+            str(machine.flake.path), machine.name, "my_generator/my_value"
+        ).printable_value
+        == "public"
+    )
+    assert (
+        get_var(
+            str(machine.flake.path), machine.name, "my_shared_generator/my_shared_value"
+        ).printable_value
         == "shared"
     )
     vars_text = stringify_all_vars(machine)
@@ -587,7 +594,7 @@ def test_api_set_prompts(
     flake: ClanFlake,
 ) -> None:
     from clan_cli.vars._types import GeneratorUpdate
-    from clan_cli.vars.list import get_prompts, set_prompts
+    from clan_cli.vars.list import get_generators, set_prompts
 
     config = flake.machines["my_machine"]
     config["nixpkgs"]["hostPlatform"] = "x86_64-linux"
@@ -623,11 +630,11 @@ def test_api_set_prompts(
     )
     assert store.get(Generator("my_generator"), "prompt1").decode() == "input2"
 
-    api_prompts = get_prompts(**params)
-    assert len(api_prompts) == 1
-    assert api_prompts[0].name == "my_generator"
-    assert api_prompts[0].prompts[0].name == "prompt1"
-    assert api_prompts[0].prompts[0].previous_value == "input2"
+    generators = get_generators(**params)
+    assert len(generators) == 1
+    assert generators[0].name == "my_generator"
+    assert generators[0].prompts[0].name == "prompt1"
+    assert generators[0].prompts[0].previous_value == "input2"
 
 
 @pytest.mark.with_core
@@ -843,19 +850,27 @@ def test_invalidation(
     monkeypatch.chdir(flake.path)
     cli.run(["vars", "generate", "--flake", str(flake.path), "my_machine"])
     machine = Machine(name="my_machine", flake=FlakeId(str(flake.path)))
-    value1 = get_var(machine, "my_generator/my_value").printable_value
+    value1 = get_var(
+        str(machine.flake.path), machine.name, "my_generator/my_value"
+    ).printable_value
     # generate again and make sure nothing changes without the invalidation data being set
     cli.run(["vars", "generate", "--flake", str(flake.path), "my_machine"])
-    value1_new = get_var(machine, "my_generator/my_value").printable_value
+    value1_new = get_var(
+        str(machine.flake.path), machine.name, "my_generator/my_value"
+    ).printable_value
     assert value1 == value1_new
     # set the invalidation data of the generator
     my_generator["validation"] = 1
     flake.refresh()
     # generate again and make sure the value changes
     cli.run(["vars", "generate", "--flake", str(flake.path), "my_machine"])
-    value2 = get_var(machine, "my_generator/my_value").printable_value
+    value2 = get_var(
+        str(machine.flake.path), machine.name, "my_generator/my_value"
+    ).printable_value
     assert value1 != value2
     # generate again without changing invalidation data -> value should not change
     cli.run(["vars", "generate", "--flake", str(flake.path), "my_machine"])
-    value2_new = get_var(machine, "my_generator/my_value").printable_value
+    value2_new = get_var(
+        str(machine.flake.path), machine.name, "my_generator/my_value"
+    ).printable_value
     assert value2 == value2_new