diff --git a/src/managers/builtin/pipPackageManager.ts b/src/managers/builtin/pipPackageManager.ts
index 836244bb..137cc5db 100644
--- a/src/managers/builtin/pipPackageManager.ts
+++ b/src/managers/builtin/pipPackageManager.ts
@@ -9,7 +9,6 @@ import {
     MarkdownString,
     ProgressLocation,
     ThemeIcon,
-    window,
 } from 'vscode';
 import {
     DidChangePackagesEventArgs,
@@ -21,6 +20,7 @@ import {
     PythonEnvironment,
     PythonEnvironmentApi,
 } from '../../api';
+import { showErrorMessage, withProgress } from '../../common/window.apis';
 import { updatePackagesAndNotify } from '../common/packageChanges';
 import { runPython, runUV, shouldUseUv } from './helpers';
 import { getWorkspacePackagesToInstall } from './pipUtils';
@@ -74,7 +74,7 @@ export class PipPackageManager implements PackageManager, Disposable {
             install: toInstall,
             uninstall: toUninstall,
         };
-        await window.withProgress(
+        await withProgress(
             {
                 location: ProgressLocation.Notification,
                 title: 'Installing packages',
@@ -99,7 +99,7 @@ export class PipPackageManager implements PackageManager, Disposable {
                     this.log.error('Error managing packages', e);
                     if (!manageOptions.runHeadless) {
                         setImmediate(async () => {
-                            const result = await window.showErrorMessage('Error managing packages', 'View Output');
+                            const result = await showErrorMessage('Error managing packages', 'View Output');
                             if (result === 'View Output') {
                                 this.log.show();
                             }
@@ -112,7 +112,7 @@ export class PipPackageManager implements PackageManager, Disposable {
     }
 
     async refresh(environment: PythonEnvironment): Promise<void> {
-        await window.withProgress(
+        await withProgress(
             {
                 location: ProgressLocation.Window,
                 title: 'Refreshing packages',
diff --git a/src/test/managers/common/packageManagerHeadlessConformance.unit.test.ts b/src/test/managers/common/packageManagerHeadlessConformance.unit.test.ts
new file mode 100644
index 00000000..30b0a317
--- /dev/null
+++ b/src/test/managers/common/packageManagerHeadlessConformance.unit.test.ts
@@ -0,0 +1,76 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+import * as assert from 'assert';
+import * as sinon from 'sinon';
+import { LogOutputChannel, Uri } from 'vscode';
+import { PackageManager, PythonEnvironment, PythonEnvironmentApi } from '../../../api';
+import * as errorUtils from '../../../common/errors/utils';
+import * as windowApis from '../../../common/window.apis';
+import { PipPackageManager } from '../../../managers/builtin/pipPackageManager';
+import * as pipUtils from '../../../managers/builtin/pipUtils';
+import * as builtinUtils from '../../../managers/builtin/utils';
+import { VenvManager } from '../../../managers/builtin/venvManager';
+import { CondaPackageManager } from '../../../managers/conda/condaPackageManager';
+import * as condaUtils from '../../../managers/conda/condaUtils';
+import { PoetryManager } from '../../../managers/poetry/poetryManager';
+import { PoetryPackageManager } from '../../../managers/poetry/poetryPackageManager';
+import * as poetryUtils from '../../../managers/poetry/poetryUtils';
+
+suite('Package manager headless conformance', () => {
+    const environment = {
+        envId: { id: 'test-environment', managerId: 'test-manager' },
+        environmentPath: Uri.joinPath(Uri.file(__dirname), 'path', 'to', 'environment'),
+    } as PythonEnvironment;
+
+    teardown(() => {
+        sinon.restore();
+    });
+
+    function createManagers(): PackageManager[] {
+        const api = {} as PythonEnvironmentApi;
+        const log = {
+            error: sinon.stub(),
+            info: sinon.stub(),
+            show: sinon.stub(),
+        } as unknown as LogOutputChannel;
+        return [
+            new PipPackageManager(api, log, { getProjectsByEnvironment: sinon.stub().returns([]) } as unknown as VenvManager),
+            new CondaPackageManager(api, log),
+            new PoetryPackageManager(api, log, {} as PoetryManager),
+        ];
+    }
+
+    test('does not invoke interactive package input when no packages are provided', async () => {
+        const pipPicker = sinon.stub(pipUtils, 'getWorkspacePackagesToInstall');
+        const condaPicker = sinon.stub(condaUtils, 'getCommonCondaPackagesToInstall');
+        const poetryInput = sinon.stub(windowApis, 'showInputBox');
+
+        for (const manager of createManagers()) {
+            await manager.manage(environment, { install: [], runHeadless: true });
+        }
+
+        assert.ok(pipPicker.notCalled);
+        assert.ok(condaPicker.notCalled);
+        assert.ok(poetryInput.notCalled);
+    });
+
+    test('rejects failures without showing error notifications', async () => {
+        const operationError = new Error('package operation failed');
+        sinon.stub(windowApis, 'withProgress').callsFake(async (_options, task) => task({} as never, {} as never));
+        sinon.stub(builtinUtils, 'managePackages').rejects(operationError);
+        sinon.stub(condaUtils, 'managePackages').rejects(operationError);
+        sinon.stub(poetryUtils, 'getPoetry').resolves(undefined);
+        const showErrorMessage = sinon.stub(windowApis, 'showErrorMessage').resolves(undefined);
+        const showErrorMessageWithLogs = sinon.stub(errorUtils, 'showErrorMessageWithLogs').resolves();
+
+        for (const manager of createManagers()) {
+            await assert.rejects(
+                manager.manage(environment, { install: ['requests'], runHeadless: true }),
+            );
+        }
+
+        assert.ok(showErrorMessage.notCalled);
+        assert.ok(showErrorMessageWithLogs.notCalled);
+    });
+});