diff --git a/src/vs/editor/browser/editorExtensions.ts b/src/vs/editor/browser/editorExtensions.ts
index 2ec0187dd73014b71a3ac90f44c0fd8127b86af0..893c2159a8ff0bf3605039b13f4e06674610e826 100644
--- a/src/vs/editor/browser/editorExtensions.ts
+++ b/src/vs/editor/browser/editorExtensions.ts
@@ -407,10 +407,6 @@ export abstract class EditorAction2 extends Action2 {
 
 // --- Registration of commands and actions
 
-export function registerLanguageCommand<Args extends { [n: string]: any; }>(id: string, handler: (accessor: ServicesAccessor, args: Args) => any) {
-	CommandsRegistry.registerCommand(id, (accessor, args) => handler(accessor, args || {}));
-}
-
 
 export function registerModelAndPositionCommand(id: string, handler: (model: ITextModel, position: Position, ...args: any[]) => any) {
 	CommandsRegistry.registerCommand(id, function (accessor, ...args) {
diff --git a/src/vs/editor/contrib/colorPicker/color.ts b/src/vs/editor/contrib/colorPicker/color.ts
index d6b490128c56c98c54c0dbe9793aeeb14b349a9a..7a4383b16db95bf67029517a456d545a9c3ecf49 100644
--- a/src/vs/editor/contrib/colorPicker/color.ts
+++ b/src/vs/editor/contrib/colorPicker/color.ts
@@ -6,11 +6,11 @@
 import { CancellationToken } from 'vs/base/common/cancellation';
 import { illegalArgument } from 'vs/base/common/errors';
 import { URI } from 'vs/base/common/uri';
-import { registerLanguageCommand } from 'vs/editor/browser/editorExtensions';
 import { IRange, Range } from 'vs/editor/common/core/range';
 import { ITextModel } from 'vs/editor/common/model';
 import { ColorProviderRegistry, DocumentColorProvider, IColorInformation, IColorPresentation } from 'vs/editor/common/modes';
 import { IModelService } from 'vs/editor/common/services/modelService';
+import { CommandsRegistry } from 'vs/platform/commands/common/commands';
 
 
 export interface IColorData {
@@ -36,9 +36,9 @@ export function getColorPresentations(model: ITextModel, colorInfo: IColorInform
 	return Promise.resolve(provider.provideColorPresentations(model, colorInfo, token));
 }
 
-registerLanguageCommand('_executeDocumentColorProvider', function (accessor, args) {
+CommandsRegistry.registerCommand('_executeDocumentColorProvider', function (accessor, ...args) {
 
-	const { resource } = args;
+	const [resource] = args;
 	if (!(resource instanceof URI)) {
 		throw illegalArgument();
 	}
@@ -62,15 +62,16 @@ registerLanguageCommand('_executeDocumentColorProvider', function (accessor, arg
 });
 
 
-registerLanguageCommand('_executeColorPresentationProvider', function (accessor, args) {
+CommandsRegistry.registerCommand('_executeColorPresentationProvider', function (accessor, ...args) {
 
-	const { resource, color, range } = args;
-	if (!(resource instanceof URI) || !Array.isArray(color) || color.length !== 4 || !Range.isIRange(range)) {
+	const [color, context] = args;
+	const { uri, range } = context;
+	if (!(uri instanceof URI) || !Array.isArray(color) || color.length !== 4 || !Range.isIRange(range)) {
 		throw illegalArgument();
 	}
 	const [red, green, blue, alpha] = color;
 
-	const model = accessor.get(IModelService).getModel(resource);
+	const model = accessor.get(IModelService).getModel(uri);
 	if (!model) {
 		throw illegalArgument();
 	}
diff --git a/src/vs/workbench/api/common/extHostApiCommands.ts b/src/vs/workbench/api/common/extHostApiCommands.ts
index 040857995840599c0a595f063c6d4a6eb2a46a30..afd58a28ff19e1ae8342574a274b83016c687926 100644
--- a/src/vs/workbench/api/common/extHostApiCommands.ts
+++ b/src/vs/workbench/api/common/extHostApiCommands.ts
@@ -309,6 +309,30 @@ const newCommands: ApiCommand[] = [
 			})(value);
 		})
 	),
+	// --- colors
+	new ApiCommand(
+		'vscode.executeDocumentColorProvider', '_executeDocumentColorProvider', 'Execute document color provider.',
+		[ApiCommandArgument.Uri],
+		new ApiCommandResult<IRawColorInfo[], vscode.ColorInformation[]>('A promise that resolves to an array of ColorInformation objects.', result => {
+			if (result) {
+				return result.map(ci => new types.ColorInformation(typeConverters.Range.to(ci.range), typeConverters.Color.to(ci.color)));
+			}
+			return [];
+		})
+	),
+	new ApiCommand(
+		'vscode.executeColorPresentationProvider', '_executeColorPresentationProvider', 'Execute color presentation provider.',
+		[
+			new ApiCommandArgument<types.Color, [number, number, number, number]>('color', 'The color to show and insert', v => v instanceof types.Color, typeConverters.Color.from),
+			new ApiCommandArgument<{ uri: URI, range: types.Range; }, { uri: URI, range: IRange; }>('context', 'Context object with uri and range', _v => true, v => ({ uri: v.uri, range: typeConverters.Range.from(v.range) })),
+		],
+		new ApiCommandResult<modes.IColorPresentation[], types.ColorPresentation[]>('A promise that resolves to an array of ColorPresentation objects.', result => {
+			if (result) {
+				return result.map(typeConverters.ColorPresentation.to);
+			}
+			return [];
+		})
+	)
 ];
 
 //#endregion
@@ -332,21 +356,7 @@ export class ExtHostApiCommands {
 
 	registerCommands() {
 
-		this._register('vscode.executeDocumentColorProvider', this._executeDocumentColorProvider, {
-			description: 'Execute document color provider.',
-			args: [
-				{ name: 'uri', description: 'Uri of a text document', constraint: URI },
-			],
-			returns: 'A promise that resolves to an array of ColorInformation objects.'
-		});
-		this._register('vscode.executeColorPresentationProvider', this._executeColorPresentationProvider, {
-			description: 'Execute color presentation provider.',
-			args: [
-				{ name: 'color', description: 'The color to show and insert', constraint: types.Color },
-				{ name: 'context', description: 'Context object with uri and range' }
-			],
-			returns: 'A promise that resolves to an array of ColorPresentation objects.'
-		});
+
 
 		this._register('vscode.resolveNotebookContentProviders', this._resolveNotebookContentProviders, {
 			description: 'Resolve Notebook Content Providers',
@@ -426,32 +436,6 @@ export class ExtHostApiCommands {
 		this._disposables.add(disposable);
 	}
 
-	private _executeDocumentColorProvider(resource: URI): Promise<types.ColorInformation[]> {
-		const args = {
-			resource
-		};
-		return this._commands.executeCommand<IRawColorInfo[]>('_executeDocumentColorProvider', args).then(result => {
-			if (result) {
-				return result.map(ci => ({ range: typeConverters.Range.to(ci.range), color: typeConverters.Color.to(ci.color) }));
-			}
-			return [];
-		});
-	}
-
-	private _executeColorPresentationProvider(color: types.Color, context: { uri: URI, range: types.Range; }): Promise<types.ColorPresentation[]> {
-		const args = {
-			resource: context.uri,
-			color: typeConverters.Color.from(color),
-			range: typeConverters.Range.from(context.range),
-		};
-		return this._commands.executeCommand<modes.IColorPresentation[]>('_executeColorPresentationProvider', args).then(result => {
-			if (result) {
-				return result.map(typeConverters.ColorPresentation.to);
-			}
-			return [];
-		});
-	}
-
 
 	private _resolveNotebookContentProviders(): Promise<{
 		viewType: string;