[Nitro CLI] Handle duplicated names

src/Nitro/CommandLine/src/CommandLine/Commands/Clients/CreateClientCommand.cs

@@ -70,6 +70,7 @@ private static async Task<int> ExecuteAsync(
                     {
                         ICreateClientCommandMutation_CreateClient_Errors_ApiNotFoundError err => err.Message,
                         ICreateClientCommandMutation_CreateClient_Errors_UnauthorizedOperation err => err.Message,
+                        ICreateClientCommandMutation_CreateClient_Errors_DuplicateNameError => Messages.DuplicateName(name, "Client"),
                         IError err => Messages.UnexpectedMutationError(err),
                         _ => Messages.UnexpectedMutationError()
                     };

src/Nitro/CommandLine/src/CommandLine/Commands/Mcp/CreateMcpFeatureCollectionCommand.cs

@@ -68,6 +68,7 @@ private static async Task<int> ExecuteAsync(
                     {
                         IApiNotFoundError err => err.Message,
                         IUnauthorizedOperation err => err.Message,
+                        IDuplicateNameError => Messages.DuplicateName(name, "MCP Feature Collection"),
                         IError err => Messages.UnexpectedMutationError(err),
                         _ => Messages.UnexpectedMutationError()
                     };

src/Nitro/CommandLine/src/CommandLine/Commands/OpenApi/CreateOpenApiCollectionCommand.cs

@@ -68,6 +68,7 @@ private static async Task<int> ExecuteAsync(
                     {
                         IApiNotFoundError err => err.Message,
                         IUnauthorizedOperation err => err.Message,
+                        IDuplicateNameError => Messages.DuplicateName(name, "OpenAPI Collection"),
                         IError err => Messages.UnexpectedMutationError(err),
                         _ => Messages.UnexpectedMutationError()
                     };

src/Nitro/CommandLine/src/CommandLine/Messages.cs

@@ -17,6 +17,9 @@ public static string UnexpectedMutationError()
     public static string UnexpectedMutationError(IError error)
         => $"Unexpected mutation error: {error.Message}";
 
+    public static string DuplicateName(string name, string entity)
+        => $"The name '{name.EscapeMarkup()}' is already in use by another {entity}.";
+
     public static string SchemaFileDoesNotExist(string path) => $"Schema file '{path}' does not exist.";
 
     public static string SchemaSettingsFileDoesNotExist(string path) => $"Schema settings file '{path}' does not exist.";

src/Nitro/CommandLine/test/CommandLine.Tests/Commands/Clients/CreateClientCommandTests.cs

@@ -320,13 +320,17 @@ public static TheoryData<ICreateClientCommandMutation_CreateClient_Errors, strin
         var unauthorized = new Mock<ICreateClientCommandMutation_CreateClient_Errors_UnauthorizedOperation>(MockBehavior.Strict);
         unauthorized.As<IUnauthorizedOperation>().SetupGet(x => x.Message).Returns("Unauthorized operation.");
 
+        var duplicateName = new Mock<ICreateClientCommandMutation_CreateClient_Errors_DuplicateNameError>(MockBehavior.Strict);
+        duplicateName.As<IDuplicateNameError>().SetupGet(x => x.Message).Returns("Name already in use.");
+
         var genericError = new Mock<ICreateClientCommandMutation_CreateClient_Errors>(MockBehavior.Strict);
         genericError.As<IError>().SetupGet(x => x.Message).Returns("something bad happened");
 
         return new()
         {
             { apiNotFound.Object, "The API was not found." },
             { unauthorized.Object, "Unauthorized operation." },
+            { duplicateName.Object, "The name 'web-client' is already in use by another Client." },
             { genericError.Object, "Unexpected mutation error: something bad happened" }
         };
     }

src/Nitro/CommandLine/test/CommandLine.Tests/Commands/Mcp/CreateMcpFeatureCollectionCommandTests.cs

@@ -258,6 +258,11 @@ public static TheoryData<ICreateMcpFeatureCollectionCommandMutation_CreateMcpFea
             new CreateMcpFeatureCollectionCommandMutation_CreateMcpFeatureCollection_Errors_UnauthorizedOperation(
                 "Not authorized", "UnauthorizedOperation"),
             "Not authorized"
+        },
+        {
+            new CreateMcpFeatureCollectionCommandMutation_CreateMcpFeatureCollection_Errors_DuplicateNameError(
+                "Name already in use", "DuplicateNameError"),
+            "The name 'my-mcp' is already in use by another MCP Feature Collection."
         }
     };
 }

src/Nitro/CommandLine/test/CommandLine.Tests/Commands/OpenApi/CreateOpenApiCollectionCommandTests.cs

@@ -286,6 +286,13 @@ API not found
                 """
                 Not authorized
                 """
+            },
+            {
+                new CreateOpenApiCollectionCommandMutation_CreateOpenApiCollection_Errors_DuplicateNameError(
+                    "Name already in use", "DuplicateNameError"),
+                """
+                The name 'my-openapi' is already in use by another OpenAPI Collection.
+                """
             }
         };
 }

src/Nitro/Common/src/ChilliCream.Nitro.Client/Clients/Operations/CreateClientCommand.graphql

@@ -7,6 +7,7 @@ mutation CreateClientCommandMutation($input: CreateClientInput!) {
       ...Error
       ...ApiNotFoundError
       ...UnauthorizedOperation
+      ...DuplicateNameError
     }
   }
 }