diff --git a/src/vs/editor/common/modes.ts b/src/vs/editor/common/modes.ts
index 38220616526..602f8ba5f50 100644
--- a/src/vs/editor/common/modes.ts
+++ b/src/vs/editor/common/modes.ts
@@ -718,27 +718,32 @@ export interface InlineCompletion {
 	 * If the text contains a line break, the range must end at the end of a line.
 	 * If existing text should be replaced, the existing text must be a prefix of the text to insert.
 	*/
-	text: string;
+	readonly text: string;
 
 	/**
 	 * The range to replace.
 	 * Must begin and end on the same line.
 	*/
-	range?: IRange;
+	readonly range?: IRange;
+
+	readonly command?: Command;
 }
 
 /**
  * @internal
  */
 export interface InlineCompletions<TItem extends InlineCompletion = InlineCompletion> {
-	items: TItem[];
+	readonly items: readonly TItem[];
 }
 
 /**
  * @internal
  */
-export interface InlineCompletionsProvider {
-	provideInlineCompletions(model: model.ITextModel, position: Position, context: InlineCompletionContext, token: CancellationToken): ProviderResult<InlineCompletions>;
+export interface InlineCompletionsProvider<T extends InlineCompletions = InlineCompletions> {
+	provideInlineCompletions(model: model.ITextModel, position: Position, context: InlineCompletionContext, token: CancellationToken): ProviderResult<T>;
+
+	handleItemDidShow?(completions: T, item: T['items'][number]): void;
+	freeInlineCompletions(completions: T): void;
 }
 
 export interface CodeAction {
diff --git a/src/vs/editor/contrib/inlineCompletions/ghostTextController.ts b/src/vs/editor/contrib/inlineCompletions/ghostTextController.ts
index f8e86f44aa3..f428d1f99c5 100644
--- a/src/vs/editor/contrib/inlineCompletions/ghostTextController.ts
+++ b/src/vs/editor/contrib/inlineCompletions/ghostTextController.ts
@@ -13,6 +13,7 @@ import { GhostTextWidget } from 'vs/editor/contrib/inlineCompletions/ghostTextWi
 import { InlineCompletionsModel } from 'vs/editor/contrib/inlineCompletions/inlineCompletionsModel';
 import { SuggestWidgetAdapterModel } from 'vs/editor/contrib/inlineCompletions/suggestWidgetAdapterModel';
 import * as nls from 'vs/nls';
+import { ICommandService } from 'vs/platform/commands/common/commands';
 import { IContextKeyService, RawContextKey } from 'vs/platform/contextkey/common/contextkey';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
 
@@ -31,7 +32,7 @@ class GhostTextController extends Disposable {
 
 	constructor(
 		private readonly editor: ICodeEditor,
-		@IInstantiationService instantiationService: IInstantiationService,
+		@IInstantiationService private readonly instantiationService: IInstantiationService,
 		@IContextKeyService contextKeyService: IContextKeyService,
 	) {
 		super();
@@ -55,7 +56,7 @@ class GhostTextController extends Disposable {
 
 		this.activeController.value = undefined;
 		this.activeController.value = this.editor.hasModel() && suggestOptions.showSuggestionPreview
-			? new ActiveGhostTextController(this.editor, this.widget, this.contextKeys)
+			? this.instantiationService.createInstance(ActiveGhostTextController, this.editor, this.widget, this.contextKeys)
 			: undefined;
 	}
 
@@ -92,12 +93,13 @@ class GhostTextContextKeys {
 */
 export class ActiveGhostTextController extends Disposable {
 	private readonly suggestWidgetAdapterModel = new SuggestWidgetAdapterModel(this.editor);
-	private readonly inlineCompletionsModel = new InlineCompletionsModel(this.editor);
+	private readonly inlineCompletionsModel = new InlineCompletionsModel(this.editor, this.commandService);
 
 	constructor(
 		private readonly editor: IActiveCodeEditor,
 		private readonly widget: GhostTextWidget,
 		private readonly contextKeys: GhostTextContextKeys,
+		@ICommandService private readonly commandService: ICommandService,
 	) {
 		super();
 
diff --git a/src/vs/editor/contrib/inlineCompletions/inlineCompletionsModel.ts b/src/vs/editor/contrib/inlineCompletions/inlineCompletionsModel.ts
index 6c64a6cf71a..42edbf19b05 100644
--- a/src/vs/editor/contrib/inlineCompletions/inlineCompletionsModel.ts
+++ b/src/vs/editor/contrib/inlineCompletions/inlineCompletionsModel.ts
@@ -5,7 +5,7 @@
 
 import { CancelablePromise, createCancelablePromise, RunOnceScheduler } from 'vs/base/common/async';
 import { CancellationToken } from 'vs/base/common/cancellation';
-import { onUnexpectedError } from 'vs/base/common/errors';
+import { onUnexpectedError, onUnexpectedExternalError } from 'vs/base/common/errors';
 import { Emitter } from 'vs/base/common/event';
 import { Disposable, IDisposable, MutableDisposable, toDisposable } from 'vs/base/common/lifecycle';
 import * as strings from 'vs/base/common/strings';
@@ -13,9 +13,10 @@ import { IActiveCodeEditor } from 'vs/editor/browser/editorBrowser';
 import { Position } from 'vs/editor/common/core/position';
 import { Range } from 'vs/editor/common/core/range';
 import { ITextModel } from 'vs/editor/common/model';
-import { InlineCompletion, InlineCompletionContext, InlineCompletions, InlineCompletionsProviderRegistry, InlineCompletionTriggerKind } from 'vs/editor/common/modes';
+import { InlineCompletion, InlineCompletionContext, InlineCompletions, InlineCompletionsProvider, InlineCompletionsProviderRegistry, InlineCompletionTriggerKind } from 'vs/editor/common/modes';
 import { BaseGhostTextWidgetModel, GhostText, GhostTextWidgetModel } from 'vs/editor/contrib/inlineCompletions/ghostTextWidget';
 import { EditOperation } from 'vs/editor/common/core/editOperation';
+import { ICommandService } from 'vs/platform/commands/common/commands';
 
 export class InlineCompletionsModel extends Disposable implements GhostTextWidgetModel {
 	protected readonly onDidChangeEmitter = new Emitter<void>();
@@ -25,7 +26,10 @@ export class InlineCompletionsModel extends Disposable implements GhostTextWidge
 
 	private active: boolean = false;
 
-	constructor(private readonly editor: IActiveCodeEditor) {
+	constructor(
+		private readonly editor: IActiveCodeEditor,
+		private readonly commandService: ICommandService
+	) {
 		super();
 
 		this._register(this.editor.onDidChangeModelContent((e) => {
@@ -83,7 +87,7 @@ export class InlineCompletionsModel extends Disposable implements GhostTextWidge
 		if (this.completionSession.value) {
 			return;
 		}
-		this.completionSession.value = new InlineCompletionsSession(this.editor, this.editor.getPosition(), () => this.active);
+		this.completionSession.value = new InlineCompletionsSession(this.editor, this.editor.getPosition(), () => this.active, this.commandService);
 		this.completionSession.value.takeOwnership(
 			this.completionSession.value.onDidChange(() => {
 				this.onDidChangeEmitter.fire();
@@ -120,7 +124,7 @@ class CachedInlineCompletion {
 	public lastRange: Range;
 
 	constructor(
-		public readonly inlineCompletion: NormalizedInlineCompletion,
+		public readonly inlineCompletion: LiveInlineCompletion,
 		public readonly decorationId: string,
 	) {
 		this.lastRange = inlineCompletion.range;
@@ -130,19 +134,38 @@ class CachedInlineCompletion {
 class InlineCompletionsSession extends BaseGhostTextWidgetModel {
 	public readonly minReservedLineCount = 0;
 
-	private updatePromise: CancelablePromise<NormalizedInlineCompletions> | undefined = undefined;
+	private updatePromise: CancelablePromise<LiveInlineCompletions> | undefined = undefined;
 	private cachedCompletions: CachedInlineCompletion[] | undefined = undefined;
+	private cachedCompletionsSource: LiveInlineCompletions | undefined = undefined;
 
 	private updateSoon = this._register(new RunOnceScheduler(() => this.update(), 50));
 	private readonly textModel = this.editor.getModel();
 
-	constructor(editor: IActiveCodeEditor, private readonly triggerPosition: Position, private readonly shouldUpdate: () => boolean) {
+	constructor(
+		editor: IActiveCodeEditor,
+		private readonly triggerPosition: Position,
+		private readonly shouldUpdate: () => boolean,
+		private readonly commandService: ICommandService,
+	) {
 		super(editor);
 		this._register(toDisposable(() => {
 			this.clearGhostTextPromise();
 			this.clearCache();
 		}));
 
+		let lastCompletionItem: InlineCompletion | undefined = undefined;
+		this._register(this.onDidChange(() => {
+			const currentCompletion = this.currentCompletion;
+			if (currentCompletion && currentCompletion.sourceInlineCompletion !== lastCompletionItem) {
+				lastCompletionItem = currentCompletion.sourceInlineCompletion;
+
+				const provider = currentCompletion.sourceProvider;
+				if (provider.handleItemDidShow) {
+					provider.handleItemDidShow(currentCompletion.sourceInlineCompletions, lastCompletionItem);
+				}
+			}
+		}));
+
 		this._register(this.editor.onDidChangeModelDecorations(e => {
 			if (!this.cachedCompletions) {
 				return;
@@ -219,14 +242,18 @@ class InlineCompletionsSession extends BaseGhostTextWidgetModel {
 		return currentCompletion ? inlineCompletionToGhostText(currentCompletion, this.editor.getModel()) : undefined;
 	}
 
-	get currentCompletion(): NormalizedInlineCompletion | undefined {
+	get currentCompletion(): LiveInlineCompletion | undefined {
 		const completion = this.currentCachedCompletion;
 		if (!completion) {
 			return undefined;
 		}
 		return {
 			text: completion.inlineCompletion.text,
-			range: completion.lastRange
+			range: completion.lastRange,
+			command: completion.inlineCompletion.command,
+			sourceProvider: completion.inlineCompletion.sourceProvider,
+			sourceInlineCompletions: completion.inlineCompletion.sourceInlineCompletions,
+			sourceInlineCompletion: completion.inlineCompletion.sourceInlineCompletion,
 		};
 	}
 
@@ -262,15 +289,24 @@ class InlineCompletionsSession extends BaseGhostTextWidgetModel {
 				}))
 			);
 
+			this.cachedCompletionsSource?.dispose();
+			this.cachedCompletionsSource = result;
 			this.cachedCompletions = result.items.map((item, idx) => new CachedInlineCompletion(item, decorationIds[idx]));
 			this.onDidChangeEmitter.fire();
 		}, onUnexpectedError);
 	}
 
 	private clearCache(): void {
-		if (this.cachedCompletions) {
-			this.editor.deltaDecorations(this.cachedCompletions.map(c => c.decorationId), []);
+		const completions = this.cachedCompletions;
+		if (completions) {
 			this.cachedCompletions = undefined;
+			this.editor.deltaDecorations(completions.map(c => c.decorationId), []);
+
+			if (!this.cachedCompletionsSource) {
+				throw new Error('Unexpected state');
+			}
+			this.cachedCompletionsSource.dispose();
+			this.cachedCompletionsSource = undefined;
 		}
 	}
 
@@ -292,7 +328,7 @@ class InlineCompletionsSession extends BaseGhostTextWidgetModel {
 		}
 	}
 
-	public commit(completion: NormalizedInlineCompletion): void {
+	public commit(completion: LiveInlineCompletion): void {
 		this.clearCache();
 		this.editor.executeEdits(
 			'inlineCompletions.accept',
@@ -300,6 +336,10 @@ class InlineCompletionsSession extends BaseGhostTextWidgetModel {
 				EditOperation.replaceMove(completion.range, completion.text)
 			]
 		);
+		if (completion.command) {
+			this.commandService.executeCommand(completion.command.id, ...(completion.command.arguments || [])).then(undefined, onUnexpectedExternalError);
+		}
+
 		this.onDidChangeEmitter.fire();
 	}
 }
@@ -308,12 +348,6 @@ export interface NormalizedInlineCompletion extends InlineCompletion {
 	range: Range;
 }
 
-/**
- * Contains no duplicated items.
-*/
-export interface NormalizedInlineCompletions extends InlineCompletions<NormalizedInlineCompletion> {
-}
-
 export function inlineCompletionToGhostText(inlineCompletion: NormalizedInlineCompletion, textModel: ITextModel): GhostText | undefined {
 	const valueToBeReplaced = textModel.getValueInRange(inlineCompletion.range);
 	if (!inlineCompletion.text.startsWith(valueToBeReplaced)) {
@@ -328,6 +362,20 @@ export function inlineCompletionToGhostText(inlineCompletion: NormalizedInlineCo
 	};
 }
 
+export interface LiveInlineCompletion extends InlineCompletion {
+	range: Range;
+	sourceProvider: InlineCompletionsProvider;
+	sourceInlineCompletion: InlineCompletion;
+	sourceInlineCompletions: InlineCompletions;
+}
+
+/**
+ * Contains no duplicated items.
+*/
+export interface LiveInlineCompletions extends InlineCompletions<LiveInlineCompletion> {
+	dispose(): void;
+}
+
 function getDefaultRange(position: Position, model: ITextModel): Range {
 	const word = model.getWordAtPosition(position);
 	const maxColumn = model.getLineMaxColumn(position.lineNumber);
@@ -343,25 +391,50 @@ async function provideInlineCompletions(
 	model: ITextModel,
 	context: InlineCompletionContext,
 	token: CancellationToken = CancellationToken.None
-): Promise<NormalizedInlineCompletions> {
+): Promise<LiveInlineCompletions> {
 	const defaultReplaceRange = getDefaultRange(position, model);
 
 	const providers = InlineCompletionsProviderRegistry.all(model);
 	const results = await Promise.all(
-		providers.map(provider => provider.provideInlineCompletions(model, position, context, token))
+		providers.map(
+			async provider => {
+				const completions = await provider.provideInlineCompletions(model, position, context, token);
+				return ({
+					completions,
+					provider,
+					dispose: () => {
+						if (completions) {
+							provider.freeInlineCompletions(completions);
+						}
+					}
+				});
+			}
+		)
 	);
 
-	const itemsByHash = new Map<string, NormalizedInlineCompletion>();
+	const itemsByHash = new Map<string, LiveInlineCompletion>();
 	for (const result of results) {
-		if (result) {
-			for (const item of result.items.map<NormalizedInlineCompletion>(item => ({
+		const completions = result.completions;
+		if (completions) {
+			for (const item of completions.items.map<LiveInlineCompletion>(item => ({
 				text: item.text,
-				range: item.range ? Range.lift(item.range) : defaultReplaceRange
+				range: item.range ? Range.lift(item.range) : defaultReplaceRange,
+				command: item.command,
+				sourceProvider: result.provider,
+				sourceInlineCompletions: completions,
+				sourceInlineCompletion: item
 			}))) {
 				itemsByHash.set(JSON.stringify({ text: item.text, range: item.range }), item);
 			}
 		}
 	}
 
-	return { items: [...itemsByHash.values()] };
+	return {
+		items: [...itemsByHash.values()],
+		dispose: () => {
+			for (const result of results) {
+				result.dispose();
+			}
+		},
+	};
 }
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 10df4b473fa..48d01dc5301 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -3033,27 +3033,19 @@ declare module 'vscode' {
 
 	//#region https://github.com/microsoft/vscode/issues/124024 @hediet @alexdima
 
-	export class InlineCompletionItem {
-		/**
-		 * The text to insert.
-		 * If the text contains a line break, the range must end at the end of a line.
-		 * If existing text should be replaced, the existing text must be a prefix of the text to insert.
-		*/
-		text: string;
-
-		/**
-		 * The range to replace.
-		 * Must begin and end on the same line.
-		*/
-		range?: Range;
-
-		constructor(text: string);
+	export namespace languages {
+		export function registerInlineCompletionItemProvider(selector: DocumentSelector, provider: InlineCompletionItemProvider): Disposable;
 	}
 
-	export class InlineCompletionList {
-		items: InlineCompletionItem[];
+	export interface InlineCompletionItemProvider<T extends InlineCompletionItem = InlineCompletionItem> {
+		provideInlineCompletionItems(document: TextDocument, position: Position, context: InlineCompletionContext, token: CancellationToken): ProviderResult<InlineCompletionList<T>>;
+	}
 
-		constructor(items: InlineCompletionItem[]);
+	export interface InlineCompletionContext {
+		/**
+		 * How the completion was triggered.
+		 */
+		readonly triggerKind: InlineCompletionTriggerKind;
 	}
 
 	/**
@@ -3072,19 +3064,56 @@ declare module 'vscode' {
 		 */
 		Explicit = 1,
 	}
-	export interface InlineCompletionContext {
+
+	export class InlineCompletionList<T extends InlineCompletionItem = InlineCompletionItem> {
+		items: T[];
+
+		constructor(items: T[]);
+	}
+
+	export class InlineCompletionItem {
 		/**
-		 * How the completion was triggered.
+		 * The text to insert.
+		 * If the text contains a line break, the range must end at the end of a line.
+		 * If existing text should be replaced, the existing text must be a prefix of the text to insert.
+		*/
+		text: string;
+
+		/**
+		 * The range to replace.
+		 * Must begin and end on the same line.
+		*/
+		range?: Range;
+
+		/**
+		 * An optional {@link Command} that is executed *after* inserting this completion.
 		 */
-		readonly triggerKind: InlineCompletionTriggerKind;
+		command?: Command;
+
+		constructor(text: string, range?: Range, command?: Command);
 	}
 
-	export interface InlineCompletionItemProvider {
-		provideInlineCompletionItems(document: TextDocument, position: Position, context: InlineCompletionContext, token: CancellationToken): ProviderResult<InlineCompletionList>;
+
+	/**
+	 * Be aware that this API will not ever be finalized.
+	 */
+	export namespace window {
+		export function getInlineCompletionItemController<T extends InlineCompletionItem>(provider: InlineCompletionItemProvider<T>): InlineCompletionController<T>;
 	}
 
-	export namespace languages {
-		export function registerInlineCompletionItemProvider(selector: DocumentSelector, provider: InlineCompletionItemProvider): Disposable;
+	/**
+	 * Be aware that this API will not ever be finalized.
+	 */
+	export interface InlineCompletionController<T extends InlineCompletionItem> {
+		// eslint-disable-next-line vscode-dts-event-naming
+		readonly onDidShowCompletionItem: Event<InlineCompletionItemDidShowEvent<T>>;
+	}
+
+	/**
+	 * Be aware that this API will not ever be finalized.
+	 */
+	export interface InlineCompletionItemDidShowEvent<T extends InlineCompletionItem> {
+		completionItem: T;
 	}
 
 	//#endregion
diff --git a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
index d24d5cd7c10..16a59acaf5a 100644
--- a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
+++ b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
@@ -11,7 +11,7 @@ import * as search from 'vs/workbench/contrib/search/common/search';
 import { CancellationToken } from 'vs/base/common/cancellation';
 import { Position as EditorPosition } from 'vs/editor/common/core/position';
 import { Range as EditorRange, IRange } from 'vs/editor/common/core/range';
-import { ExtHostContext, MainThreadLanguageFeaturesShape, ExtHostLanguageFeaturesShape, MainContext, IExtHostContext, ILanguageConfigurationDto, IRegExpDto, IIndentationRuleDto, IOnEnterRuleDto, ILocationDto, IWorkspaceSymbolDto, reviveWorkspaceEditDto, IDocumentFilterDto, IDefinitionLinkDto, ISignatureHelpProviderMetadataDto, ILinkDto, ICallHierarchyItemDto, ISuggestDataDto, ICodeActionDto, ISuggestDataDtoField, ISuggestResultDtoField, ICodeActionProviderMetadataDto, ILanguageWordDefinitionDto } from '../common/extHost.protocol';
+import { ExtHostContext, MainThreadLanguageFeaturesShape, ExtHostLanguageFeaturesShape, MainContext, IExtHostContext, ILanguageConfigurationDto, IRegExpDto, IIndentationRuleDto, IOnEnterRuleDto, ILocationDto, IWorkspaceSymbolDto, reviveWorkspaceEditDto, IDocumentFilterDto, IDefinitionLinkDto, ISignatureHelpProviderMetadataDto, ILinkDto, ICallHierarchyItemDto, ISuggestDataDto, ICodeActionDto, ISuggestDataDtoField, ISuggestResultDtoField, ICodeActionProviderMetadataDto, ILanguageWordDefinitionDto, IdentifiableInlineCompletions, IdentifiableInlineCompletion } from '../common/extHost.protocol';
 import { LanguageConfigurationRegistry } from 'vs/editor/common/modes/languageConfigurationRegistry';
 import { LanguageConfiguration, IndentationRule, OnEnterRule } from 'vs/editor/common/modes/languageConfiguration';
 import { IModeService } from 'vs/editor/common/services/modeService';
@@ -500,9 +500,15 @@ export class MainThreadLanguageFeatures implements MainThreadLanguageFeaturesSha
 	}
 
 	$registerInlineCompletionsSupport(handle: number, selector: IDocumentFilterDto[]): void {
-		const provider: modes.InlineCompletionsProvider = {
-			provideInlineCompletions: async (model: ITextModel, position: EditorPosition, context: modes.InlineCompletionContext, token: CancellationToken): Promise<modes.InlineCompletions | undefined> => {
+		const provider: modes.InlineCompletionsProvider<IdentifiableInlineCompletions> = {
+			provideInlineCompletions: async (model: ITextModel, position: EditorPosition, context: modes.InlineCompletionContext, token: CancellationToken): Promise<IdentifiableInlineCompletions | undefined> => {
 				return this._proxy.$provideInlineCompletions(handle, model.uri, position, context, token);
+			},
+			handleItemDidShow: async (completions: IdentifiableInlineCompletions, item: IdentifiableInlineCompletion): Promise<void> => {
+				return this._proxy.$handleInlineCompletionDidShow(handle, completions.pid, item.idx);
+			},
+			freeInlineCompletions: (completions: IdentifiableInlineCompletions): void => {
+				this._proxy.$freeInlineCompletionsList(handle, completions.pid);
 			}
 		};
 		this._registrations.set(handle, modes.InlineCompletionsProviderRegistry.register(selector, provider));
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 05e4c4a1d1d..9eb6164fddc 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -28,7 +28,7 @@ import { IExtHostDocumentsAndEditors } from 'vs/workbench/api/common/extHostDocu
 import { Extension, IExtHostExtensionService } from 'vs/workbench/api/common/extHostExtensionService';
 import { ExtHostFileSystem } from 'vs/workbench/api/common/extHostFileSystem';
 import { ExtHostFileSystemEventService } from 'vs/workbench/api/common/extHostFileSystemEventService';
-import { ExtHostLanguageFeatures } from 'vs/workbench/api/common/extHostLanguageFeatures';
+import { ExtHostLanguageFeatures, InlineCompletionController } from 'vs/workbench/api/common/extHostLanguageFeatures';
 import { ExtHostLanguages } from 'vs/workbench/api/common/extHostLanguages';
 import { ExtHostMessageService } from 'vs/workbench/api/common/extHostMessageService';
 import { IExtHostOutputService } from 'vs/workbench/api/common/extHostOutput';
@@ -730,6 +730,10 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			get onDidChangeOpenEditors() {
 				checkProposedApiEnabled(extension);
 				return extHostEditorTabs.onDidChangeTabs;
+			},
+			getInlineCompletionItemController<T extends vscode.InlineCompletionItem>(provider: vscode.InlineCompletionItemProvider<T>): vscode.InlineCompletionController<T> {
+				checkProposedApiEnabled(extension);
+				return InlineCompletionController.get(provider);
 			}
 		};
 
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index a9c6c7df8da..de99509e145 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -367,6 +367,14 @@ export interface ISignatureHelpProviderMetadataDto {
 	readonly retriggerCharacters: readonly string[];
 }
 
+export interface IdentifiableInlineCompletions extends modes.InlineCompletions<IdentifiableInlineCompletion> {
+	pid: number;
+}
+
+export interface IdentifiableInlineCompletion extends modes.InlineCompletion {
+	idx: number;
+}
+
 export interface MainThreadLanguageFeaturesShape extends IDisposable {
 	$unregister(handle: number): void;
 	$registerDocumentSymbolProvider(handle: number, selector: IDocumentFilterDto[], label: string): void;
@@ -1640,7 +1648,9 @@ export interface ExtHostLanguageFeaturesShape {
 	$provideCompletionItems(handle: number, resource: UriComponents, position: IPosition, context: modes.CompletionContext, token: CancellationToken): Promise<ISuggestResultDto | undefined>;
 	$resolveCompletionItem(handle: number, id: ChainedCacheId, token: CancellationToken): Promise<ISuggestDataDto | undefined>;
 	$releaseCompletionItems(handle: number, id: number): void;
-	$provideInlineCompletions(handle: number, resource: UriComponents, position: IPosition, context: modes.InlineCompletionContext, token: CancellationToken): Promise<modes.InlineCompletions | undefined>;
+	$provideInlineCompletions(handle: number, resource: UriComponents, position: IPosition, context: modes.InlineCompletionContext, token: CancellationToken): Promise<IdentifiableInlineCompletions | undefined>;
+	$handleInlineCompletionDidShow(handle: number, pid: number, idx: number): void;
+	$freeInlineCompletionsList(handle: number, pid: number): void;
 	$provideSignatureHelp(handle: number, resource: UriComponents, position: IPosition, context: modes.SignatureHelpContext, token: CancellationToken): Promise<ISignatureHelpDto | undefined>;
 	$releaseSignatureHelp(handle: number, id: number): void;
 	$provideInlayHints(handle: number, resource: UriComponents, range: IRange, token: CancellationToken): Promise<IInlayHintsDto | undefined>
diff --git a/src/vs/workbench/api/common/extHostLanguageFeatures.ts b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
index 265585c0771..adaa21ddb4c 100644
--- a/src/vs/workbench/api/common/extHostLanguageFeatures.ts
+++ b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
@@ -33,6 +33,7 @@ import { IExtHostApiDeprecationService } from 'vs/workbench/api/common/extHostAp
 import { Cache } from './cache';
 import { StopWatch } from 'vs/base/common/stopwatch';
 import { CancellationError } from 'vs/base/common/errors';
+import { Emitter } from 'vs/base/common/event';
 
 // --- adapter
 
@@ -1038,15 +1039,17 @@ class SuggestAdapter {
 	}
 }
 
-class InlineCompletionsAdapter {
+class InlineCompletionAdapter {
+	private readonly _cache = new Cache<vscode.InlineCompletionItem>('InlineCompletionItem');
+	private readonly _disposables = new Map<number, DisposableStore>();
 
 	constructor(
 		private readonly _documents: ExtHostDocuments,
 		private readonly _provider: vscode.InlineCompletionItemProvider,
+		private readonly _commands: CommandsConverter,
 	) { }
 
-	async provideInlineCompletions(resource: URI, position: IPosition, context: vscode.InlineCompletionContext, token: CancellationToken): Promise<modes.InlineCompletions | undefined> {
-
+	public async provideInlineCompletions(resource: URI, position: IPosition, context: vscode.InlineCompletionContext, token: CancellationToken): Promise<extHostProtocol.IdentifiableInlineCompletions | undefined> {
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
@@ -1063,13 +1066,69 @@ class InlineCompletionsAdapter {
 			return undefined;
 		}
 
+		const pid = this._cache.add(result.items);
+
+		let disposableStore: DisposableStore | undefined = undefined;
+
 		return {
-			items: result.items.map(item => ({
-				text: item.text,
-				range: item.range ? typeConvert.Range.from(item.range) : undefined,
-			})),
+			pid,
+			items: result.items.map<extHostProtocol.IdentifiableInlineCompletion>((item, idx) => {
+				let command: modes.Command | undefined = undefined;
+				if (item.command) {
+					if (!disposableStore) {
+						disposableStore = new DisposableStore();
+						this._disposables.set(pid, disposableStore);
+					}
+					command = this._commands.toInternal(item.command, disposableStore);
+				}
+
+				return ({
+					text: item.text,
+					range: item.range ? typeConvert.Range.from(item.range) : undefined,
+					command,
+					idx: idx,
+				});
+			}),
 		};
 	}
+
+	public disposeCompletions(pid: number) {
+		this._cache.delete(pid);
+		const d = this._disposables.get(pid);
+		if (d) {
+			d.clear();
+		}
+		this._disposables.delete(pid);
+	}
+
+	public handleDidShowCompletionItem(pid: number, idx: number): void {
+		const completionItem = this._cache.get(pid, idx);
+		if (completionItem) {
+			InlineCompletionController.get(this._provider).fireOnDidShowCompletionItem({
+				completionItem
+			});
+		}
+	}
+}
+
+export class InlineCompletionController<T extends vscode.InlineCompletionItem> implements vscode.InlineCompletionController<T> {
+	private static readonly map = new WeakMap<vscode.InlineCompletionItemProvider<any>, InlineCompletionController<any>>();
+
+	public static get<T extends vscode.InlineCompletionItem>(provider: vscode.InlineCompletionItemProvider<T>): InlineCompletionController<T> {
+		let existing = InlineCompletionController.map.get(provider);
+		if (!existing) {
+			existing = new InlineCompletionController();
+			InlineCompletionController.map.set(provider, existing);
+		}
+		return existing;
+	}
+
+	private readonly _onDidShowCompletionItemEmitter = new Emitter<vscode.InlineCompletionItemDidShowEvent<T>>();
+	public readonly onDidShowCompletionItem: vscode.Event<vscode.InlineCompletionItemDidShowEvent<T>> = this._onDidShowCompletionItemEmitter.event;
+
+	public fireOnDidShowCompletionItem(event: vscode.InlineCompletionItemDidShowEvent<T>): void {
+		this._onDidShowCompletionItemEmitter.fire(event);
+	}
 }
 
 class SignatureHelpAdapter {
@@ -1389,7 +1448,7 @@ type Adapter = DocumentSymbolAdapter | CodeLensAdapter | DefinitionAdapter | Hov
 	| TypeDefinitionAdapter | ColorProviderAdapter | FoldingProviderAdapter | DeclarationAdapter
 	| SelectionRangeAdapter | CallHierarchyAdapter | DocumentSemanticTokensAdapter | DocumentRangeSemanticTokensAdapter
 	| EvaluatableExpressionAdapter | InlineValuesAdapter
-	| LinkedEditingRangeAdapter | InlayHintsAdapter | InlineCompletionsAdapter;
+	| LinkedEditingRangeAdapter | InlayHintsAdapter | InlineCompletionAdapter;
 
 class AdapterData {
 	constructor(
@@ -1846,15 +1905,24 @@ export class ExtHostLanguageFeatures implements extHostProtocol.ExtHostLanguageF
 	// --- ghost test
 
 	registerInlineCompletionsProvider(extension: IExtensionDescription, selector: vscode.DocumentSelector, provider: vscode.InlineCompletionItemProvider): vscode.Disposable {
-		const handle = this._addNewAdapter(new InlineCompletionsAdapter(this._documents, provider), extension);
+		const handle = this._addNewAdapter(new InlineCompletionAdapter(this._documents, provider, this._commands.converter), extension);
 		this._proxy.$registerInlineCompletionsSupport(handle, this._transformDocumentSelector(selector));
 		return this._createDisposable(handle);
 	}
 
-	$provideInlineCompletions(handle: number, resource: UriComponents, position: IPosition, context: modes.InlineCompletionContext, token: CancellationToken): Promise<modes.InlineCompletions | undefined> {
-		return this._withAdapter(handle, InlineCompletionsAdapter, adapter => adapter.provideInlineCompletions(URI.revive(resource), position, context, token), undefined);
+	$provideInlineCompletions(handle: number, resource: UriComponents, position: IPosition, context: modes.InlineCompletionContext, token: CancellationToken): Promise<extHostProtocol.IdentifiableInlineCompletions | undefined> {
+		return this._withAdapter(handle, InlineCompletionAdapter, adapter => adapter.provideInlineCompletions(URI.revive(resource), position, context, token), undefined);
 	}
 
+	$handleInlineCompletionDidShow(handle: number, pid: number, idx: number): void {
+		this._withAdapter(handle, InlineCompletionAdapter, async adapter => {
+			adapter.handleDidShowCompletionItem(pid, idx);
+		}, undefined);
+	}
+
+	$freeInlineCompletionsList(handle: number, pid: number): void {
+		this._withAdapter(handle, InlineCompletionAdapter, async adapter => { adapter.disposeCompletions(pid); }, undefined);
+	}
 
 	// --- parameter hints
 
diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index fdccb8c119c..cca39a130b3 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -1552,9 +1552,12 @@ export class InlineSuggestion implements vscode.InlineCompletionItem {
 
 	text: string;
 	range?: Range;
+	command?: vscode.Command;
 
-	constructor(text: string) {
+	constructor(text: string, range?: Range, command?: vscode.Command) {
 		this.text = text;
+		this.range = range;
+		this.command = command;
 	}
 }