Fix aspire config list --all showing no features when no config exists

src/Aspire.Cli/Commands/ConfigCommand.cs

@@ -239,36 +239,46 @@ private async Task<int> ExecuteAsync(bool showAll, CancellationToken cancellatio
             var localConfig = await ConfigurationService.GetLocalConfigurationAsync(cancellationToken);
             var globalConfig = await ConfigurationService.GetGlobalConfigurationAsync(cancellationToken);
 
+            var featurePrefix = $"{KnownFeatures.FeaturePrefix}.";
+
             // Check if we have any configuration at all
             if (localConfig.Count == 0 && globalConfig.Count == 0)
             {
                 InteractionService.DisplayMessage(KnownEmojis.Information, ConfigCommandStrings.NoConfigurationValuesFound);
-                return ExitCodeConstants.Success;
+
+                if (!showAll)
+                {
+                    // Show hint about --all flag when there's no config and user didn't pass --all
+                    InteractionService.DisplayMarkupLine($"  [dim]{ConfigCommandStrings.ListCommand_AllFeaturesHint.EscapeMarkup()}[/]");
+                    return ExitCodeConstants.Success;
+                }
+
+                // showAll=true: fall through to show available features below
             }
+            else
+            {
+                // Compute max column widths across both tables for consistent alignment
+                var keyWidth = MaxWidth(ConfigCommandStrings.HeaderKey, localConfig.Keys, globalConfig.Keys);
+                var valueWidth = MaxWidth(ConfigCommandStrings.HeaderValue, localConfig.Values, globalConfig.Values);
+
+                // Display Local Configuration
+                RenderConfigTable(
+                    ConfigCommandStrings.LocalConfigurationHeader,
+                    localConfig,
+                    ConfigCommandStrings.NoLocalConfigurationFound,
+                    keyWidth,
+                    valueWidth);
 
-            var featurePrefix = $"{KnownFeatures.FeaturePrefix}.";
+                InteractionService.DisplayEmptyLine();
 
-            // Compute max column widths across both tables for consistent alignment
-            var keyWidth = MaxWidth(ConfigCommandStrings.HeaderKey, localConfig.Keys, globalConfig.Keys);
-            var valueWidth = MaxWidth(ConfigCommandStrings.HeaderValue, localConfig.Values, globalConfig.Values);
-
-            // Display Local Configuration
-            RenderConfigTable(
-                ConfigCommandStrings.LocalConfigurationHeader,
-                localConfig,
-                ConfigCommandStrings.NoLocalConfigurationFound,
-                keyWidth,
-                valueWidth);
-
-            InteractionService.DisplayEmptyLine();
-
-            // Display Global Configuration
-            RenderConfigTable(
-                ConfigCommandStrings.GlobalConfigurationHeader,
-                globalConfig,
-                ConfigCommandStrings.NoGlobalConfigurationFound,
-                keyWidth,
-                valueWidth);
+                // Display Global Configuration
+                RenderConfigTable(
+                    ConfigCommandStrings.GlobalConfigurationHeader,
+                    globalConfig,
+                    ConfigCommandStrings.NoGlobalConfigurationFound,
+                    keyWidth,
+                    valueWidth);
+            }
 
             // Display Available Features
             var allConfiguredFeatures = localConfig.Concat(globalConfig)

tests/Aspire.Cli.Tests/Commands/ConfigCommandTests.cs

@@ -359,6 +359,50 @@ public async Task ConfigListCommand_WithAllFlag_ShowsFeatureDetails()
         Assert.Contains("default:", output);
     }
 
+    [Fact]
+    public async Task ConfigListCommand_WithoutAllFlag_NoConfig_ShowsHintAboutAllFlag()
+    {
+        using var workspace = TemporaryWorkspace.Create(outputHelper);
+        var outputWriter = new TestOutputTextWriter(outputHelper);
+        var services = CliTestHelper.CreateServiceCollection(workspace, outputHelper, options =>
+        {
+            options.OutputTextWriter = outputWriter;
+        });
+        var provider = services.BuildServiceProvider();
+
+        var command = provider.GetRequiredService<Aspire.Cli.Commands.RootCommand>();
+
+        // List without --all and with no config set
+        var listResult = command.Parse("config list");
+        var listExitCode = await listResult.InvokeAsync().DefaultTimeout();
+        Assert.Equal(0, listExitCode);
+
+        var output = string.Join("\n", outputWriter.Logs);
+        Assert.Contains("--all", output);
+    }
+
+    [Fact]
+    public async Task ConfigListCommand_WithAllFlag_NoConfig_ShowsAvailableFeatures()
+    {
+        using var workspace = TemporaryWorkspace.Create(outputHelper);
+        var outputWriter = new TestOutputTextWriter(outputHelper);
+        var services = CliTestHelper.CreateServiceCollection(workspace, outputHelper, options =>
+        {
+            options.OutputTextWriter = outputWriter;
+        });
+        var provider = services.BuildServiceProvider();
+
+        var command = provider.GetRequiredService<Aspire.Cli.Commands.RootCommand>();
+
+        // List with --all and with no config set
+        var listResult = command.Parse("config list --all");
+        var listExitCode = await listResult.InvokeAsync().DefaultTimeout();
+        Assert.Equal(0, listExitCode);
+
+        var output = string.Join("\n", outputWriter.Logs);
+        Assert.Contains("default:", output);
+    }
+
     [Fact]
     public async Task FeatureFlags_WhenSetToTrue_ReturnsTrue()
     {