diff --git a/src/vs/workbench/contrib/chat/browser/languageModelsConfigurationService.ts b/src/vs/workbench/contrib/chat/browser/languageModelsConfigurationService.ts
index 3424791911d..efed13bcbb7 100644
--- a/src/vs/workbench/contrib/chat/browser/languageModelsConfigurationService.ts
+++ b/src/vs/workbench/contrib/chat/browser/languageModelsConfigurationService.ts
@@ -20,7 +20,8 @@ import { ITextModel } from '../../../../editor/common/model.js';
 import { ITextModelService } from '../../../../editor/common/services/resolverService.js';
 import { ITextFileService } from '../../../services/textfile/common/textfiles.js';
 import { getCodeEditor } from '../../../../editor/browser/editorBrowser.js';
-import { ILanguageModelsConfigurationService, ILanguageModelsProviderGroup } from '../common/languageModelsConfiguration.js';
+import { SnippetController2 } from '../../../../editor/contrib/snippet/browser/snippetController2.js';
+import { ConfigureLanguageModelsOptions, ILanguageModelsConfigurationService, ILanguageModelsProviderGroup } from '../common/languageModelsConfiguration.js';
 import { IJSONContributionRegistry, Extensions as JSONExtensions } from '../../../../platform/jsonschemas/common/jsonContributionRegistry.js';
 import { Registry } from '../../../../platform/registry/common/platform.js';
 import { IWorkbenchContribution } from '../../../common/contributions.js';
@@ -148,9 +149,9 @@ export class LanguageModelsConfigurationService extends Disposable implements IL
 		await this.updateLanguageModelsConfiguration();
 	}
 
-	async configureLanguageModels(range?: IRange): Promise<void> {
+	async configureLanguageModels(options?: ConfigureLanguageModelsOptions): Promise<void> {
 		const editor = await this.editorGroupsService.activeGroup.openEditor(this.textEditorService.createTextEditor({ resource: this.modelsConfigurationFile }));
-		if (!editor || !range) {
+		if (!editor || !options?.group) {
 			return;
 		}
 
@@ -159,10 +160,29 @@ export class LanguageModelsConfigurationService extends Disposable implements IL
 			return;
 		}
 
-		const position = { lineNumber: range.startLineNumber, column: range.startColumn };
-		codeEditor.setPosition(position);
-		codeEditor.revealPositionNearTop(position);
-		codeEditor.focus();
+		if (!options.group.range) {
+			return;
+		}
+
+		if (options.snippet) {
+			// Insert snippet at the end of the last property line (before the closing brace line), with comma prepended
+			const model = codeEditor.getModel();
+			if (!model) {
+				return;
+			}
+			const lastPropertyLine = options.group.range.endLineNumber - 1;
+			const lastPropertyLineLength = model.getLineLength(lastPropertyLine);
+			const insertPosition = { lineNumber: lastPropertyLine, column: lastPropertyLineLength + 1 };
+			codeEditor.setPosition(insertPosition);
+			codeEditor.revealPositionNearTop(insertPosition);
+			codeEditor.focus();
+			SnippetController2.get(codeEditor)?.insert(',\n' + options.snippet);
+		} else {
+			const position = { lineNumber: options.group.range.startLineNumber, column: options.group.range.startColumn };
+			codeEditor.setPosition(position);
+			codeEditor.revealPositionNearTop(position);
+			codeEditor.focus();
+		}
 	}
 
 	private async withLanguageModelsProviderGroups(update?: (languageModelsProviderGroups: LanguageModelsProviderGroups) => Promise<LanguageModelsProviderGroups>): Promise<LanguageModelsProviderGroups> {
diff --git a/src/vs/workbench/contrib/chat/common/languageModels.ts b/src/vs/workbench/contrib/chat/common/languageModels.ts
index e8ea0fb5edd..f1f0ad87618 100644
--- a/src/vs/workbench/contrib/chat/common/languageModels.ts
+++ b/src/vs/workbench/contrib/chat/common/languageModels.ts
@@ -849,7 +849,8 @@ export class LanguageModelsService implements ILanguageModelsService {
 				: await this._languageModelsConfigurationService.addLanguageModelsProviderGroup(languageModelProviderGroup);
 
 			if (vendor.configuration && this.canConfigure(configuration ?? {}, vendor.configuration)) {
-				await this._languageModelsConfigurationService.configureLanguageModels(saved.range);
+				const snippet = this.getSnippetForFirstUnconfiguredProperty(configuration ?? {}, vendor.configuration);
+				await this._languageModelsConfigurationService.configureLanguageModels({ group: saved, snippet });
 			}
 		} catch (error) {
 			if (isCancellationError(error)) {
@@ -901,6 +902,25 @@ export class LanguageModelsService implements ILanguageModelsService {
 		return false;
 	}
 
+	private getSnippetForFirstUnconfiguredProperty(configuration: IStringDictionary<unknown>, schema: IJSONSchema): string | undefined {
+		if (!schema.properties) {
+			return undefined;
+		}
+		for (const property of Object.keys(schema.properties)) {
+			if (configuration[property] === undefined) {
+				const propertySchema = schema.properties[property];
+				if (propertySchema && typeof propertySchema !== 'boolean' && propertySchema.defaultSnippets?.[0]) {
+					const snippet = propertySchema.defaultSnippets[0];
+					let bodyText = snippet.bodyText ?? JSON.stringify(snippet.body, null, '\t');
+					// Handle ^ prefix for raw values (numbers/booleans) - remove quotes around ^-prefixed values
+					bodyText = bodyText.replace(/"(\^[^"]*)"/g, (_, value) => value.substring(1));
+					return `"${property}": ${bodyText}`;
+				}
+			}
+		}
+		return undefined;
+	}
+
 	private async promptForName(languageModelProviderGroups: readonly ILanguageModelsProviderGroup[], vendor: IUserFriendlyLanguageModel, existing: ILanguageModelsProviderGroup | undefined): Promise<string | undefined> {
 		let providerGroupName = existing?.name;
 		if (!providerGroupName) {
diff --git a/src/vs/workbench/contrib/chat/common/languageModelsConfiguration.ts b/src/vs/workbench/contrib/chat/common/languageModelsConfiguration.ts
index 9573426343e..4f0dfa41691 100644
--- a/src/vs/workbench/contrib/chat/common/languageModelsConfiguration.ts
+++ b/src/vs/workbench/contrib/chat/common/languageModelsConfiguration.ts
@@ -11,6 +11,11 @@ import { IStringDictionary } from '../../../../base/common/collections.js';
 
 export const ILanguageModelsConfigurationService = createDecorator<ILanguageModelsConfigurationService>('ILanguageModelsConfigurationService');
 
+export interface ConfigureLanguageModelsOptions {
+	group: ILanguageModelsProviderGroup;
+	snippet?: string;
+}
+
 export interface ILanguageModelsConfigurationService {
 	readonly _serviceBrand: undefined;
 
@@ -26,7 +31,7 @@ export interface ILanguageModelsConfigurationService {
 
 	removeLanguageModelsProviderGroup(languageModelGroup: ILanguageModelsProviderGroup): Promise<void>;
 
-	configureLanguageModels(range?: IRange): Promise<void>;
+	configureLanguageModels(options?: ConfigureLanguageModelsOptions): Promise<void>;
 }
 
 export interface ILanguageModelsProviderGroup extends IStringDictionary<unknown> {