diff --git a/src/vs/editor/common/modes.ts b/src/vs/editor/common/modes.ts
index 9db95948d2430..78495217dc32b 100644
--- a/src/vs/editor/common/modes.ts
+++ b/src/vs/editor/common/modes.ts
@@ -481,6 +481,7 @@ export interface CompletionItem {
 export interface CompletionList {
 	suggestions: CompletionItem[];
 	incomplete?: boolean;
+	isDetailsResolved?: boolean;
 	dispose?(): void;
 }
 
diff --git a/src/vs/editor/contrib/suggest/suggest.ts b/src/vs/editor/contrib/suggest/suggest.ts
index d28423e1602f1..c2d3185ce7d52 100644
--- a/src/vs/editor/contrib/suggest/suggest.ts
+++ b/src/vs/editor/contrib/suggest/suggest.ts
@@ -47,6 +47,9 @@ export class CompletionItem {
 	idx?: number;
 	word?: string;
 
+	//
+	readonly isDetailsResolved: boolean;
+
 	constructor(
 		readonly position: IPosition,
 		readonly completion: modes.CompletionItem,
@@ -70,6 +73,8 @@ export class CompletionItem {
 			this.editReplaceEnd = new Position(completion.range.replace.endLineNumber, completion.range.replace.endColumn);
 		}
 
+		this.isDetailsResolved = container.isDetailsResolved || typeof provider.resolveCompletionItem === 'undefined';
+
 		// create the suggestion resolver
 		const { resolveCompletionItem } = provider;
 		if (typeof resolveCompletionItem !== 'function') {
diff --git a/src/vs/monaco.d.ts b/src/vs/monaco.d.ts
index 32a3f131d6bfe..38597bc5d3b76 100644
--- a/src/vs/monaco.d.ts
+++ b/src/vs/monaco.d.ts
@@ -4854,6 +4854,7 @@ declare namespace monaco.languages {
 	export interface CompletionList {
 		suggestions: CompletionItem[];
 		incomplete?: boolean;
+		isDetailsResolved?: boolean;
 		dispose?(): void;
 	}
 
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 15d667e14fc66..27a17629b1339 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1504,4 +1504,15 @@ declare module 'vscode' {
 		export const onDidChangeActiveColorTheme: Event<ColorTheme>;
 	}
 
+	//#endregion
+
+
+	//#region https://github.com/microsoft/vscode/issues/39441
+
+	export interface CompletionList {
+		isDetailsResolved?: boolean;
+	}
+
+	//#endregion
+
 }
diff --git a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
index 0ae9f98745040..da77e770f4e09 100644
--- a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
+++ b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
@@ -367,6 +367,7 @@ export class MainThreadLanguageFeatures implements MainThreadLanguageFeaturesSha
 					return {
 						suggestions: result.b.map(d => MainThreadLanguageFeatures._inflateSuggestDto(result.a, d)),
 						incomplete: result.c,
+						isDetailsResolved: result.d,
 						dispose: () => typeof result.x === 'number' && this._proxy.$releaseCompletionItems(handle, result.x)
 					};
 				});
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 076f847e2f6b8..227a885f876f5 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -1012,6 +1012,7 @@ export interface ISuggestResultDto {
 	a: { insert: IRange, replace: IRange; };
 	b: ISuggestDataDto[];
 	c?: boolean;
+	d?: boolean;
 }
 
 export interface ISignatureHelpDto {
diff --git a/src/vs/workbench/api/common/extHostLanguageFeatures.ts b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
index ba0f638fefdf8..737ed4be71402 100644
--- a/src/vs/workbench/api/common/extHostLanguageFeatures.ts
+++ b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
@@ -787,7 +787,8 @@ class SuggestAdapter {
 				x: pid,
 				b: [],
 				a: { replace: typeConvert.Range.from(replaceRange), insert: typeConvert.Range.from(insertRange) },
-				c: list.isIncomplete || undefined
+				c: list.isIncomplete || undefined,
+				d: list.isDetailsResolved || undefined
 			};
 
 			for (let i = 0; i < list.items.length; i++) {
diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index 19819497a1e2d..5239da9499b21 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -1395,7 +1395,7 @@ export class CompletionItem implements vscode.CompletionItem {
 export class CompletionList {
 
 	isIncomplete?: boolean;
-
+	isDetailsResolved?: boolean;
 	items: vscode.CompletionItem[];
 
 	constructor(items: vscode.CompletionItem[] = [], isIncomplete: boolean = false) {