diff --git a/src/cli/commands/dev/__tests__/launch-browser-dev.test.ts b/src/cli/commands/dev/__tests__/launch-browser-dev.test.ts
new file mode 100644
index 000000000..3c00bcbea
--- /dev/null
+++ b/src/cli/commands/dev/__tests__/launch-browser-dev.test.ts
@@ -0,0 +1,90 @@
+// Regression test for #1376: launching dev from the interactive `agentcore`
+// menu must render the harness deploy inside the alt-screen DevScreen TUI (the
+// same path `agentcore dev` uses) instead of plain inline console.log lines.
+import type { AgentCoreProjectSpec } from '../../../../schema';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+const harnessOnlyProject = {
+  runtimes: [],
+  harnesses: [{ name: 'my-harness' }],
+} as unknown as AgentCoreProjectSpec;
+
+const { mockRunCliDeploy, mockRunWebUI, mockIsDeploySkippable, mockLoadProjectConfig, mockRender } = vi.hoisted(() => ({
+  mockRunCliDeploy: vi.fn().mockResolvedValue(undefined),
+  mockRunWebUI: vi.fn().mockResolvedValue(undefined),
+  mockIsDeploySkippable: vi.fn(),
+  mockLoadProjectConfig: vi.fn(),
+  mockRender: vi.fn(),
+}));
+
+vi.mock('../../deploy/progress', () => ({ runCliDeploy: mockRunCliDeploy }));
+vi.mock('../../../operations/deploy/change-detection', () => ({ isDeploySkippable: mockIsDeploySkippable }));
+vi.mock('../../../tui/screens/dev/DevScreen', () => ({ DevScreen: 'DevScreen' }));
+vi.mock('../../../tui/context', () => ({ LayoutProvider: 'LayoutProvider' }));
+vi.mock('ink', () => ({ render: (...args: unknown[]) => mockRender(...args) }));
+
+vi.mock('../../../lib', () => ({
+  getWorkingDirectory: () => '/proj',
+  findConfigRoot: () => '/proj',
+  ConfigIO: class {
+    configExists() {
+      return false;
+    }
+  },
+}));
+vi.mock('../../../operations/dev', () => ({
+  loadProjectConfig: mockLoadProjectConfig,
+  getDevSupportedAgents: () => [],
+  getDevConfig: () => undefined,
+  loadDevEnv: vi.fn().mockResolvedValue({ envVars: {} }),
+}));
+vi.mock('../../../operations/dev/otel', () => ({
+  startOtelCollector: vi.fn().mockResolvedValue({ collector: undefined, otelEnvVars: {} }),
+}));
+vi.mock('../../../operations/dev/web-ui', () => ({ runWebUI: mockRunWebUI }));
+
+import { launchBrowserDev } from '../browser-mode';
+
+/** Drive the rendered DevScreen by invoking the prop callback the picker passes. */
+function driveDevScreen(invoke: (props: Record<string, unknown>) => void): void {
+  mockRender.mockImplementation((element: { props: { children: { props: Record<string, unknown> } } }) => {
+    // Defer so the picker's `unmount` binding is initialized before the callback runs.
+    const exited = Promise.resolve().then(() => invoke(element.props.children.props));
+    return { unmount: vi.fn(), waitUntilExit: () => exited };
+  });
+}
+
+describe('launchBrowserDev (#1376 entry-path consistency)', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockLoadProjectConfig.mockResolvedValue(harnessOnlyProject);
+  });
+
+  afterEach(() => {
+    mockRender.mockReset();
+  });
+
+  it('shows the alt-screen DevScreen TUI for a harness deploy instead of inline runCliDeploy', async () => {
+    mockIsDeploySkippable.mockResolvedValue(false);
+    driveDevScreen(props => (props.onLaunchBrowser as (s: unknown) => void)({ harnessName: 'my-harness' }));
+
+    await launchBrowserDev();
+
+    expect(mockRunCliDeploy).not.toHaveBeenCalled();
+    expect(mockRender).toHaveBeenCalledOnce();
+    expect(mockRunWebUI).toHaveBeenCalledOnce();
+    const webUiArgs = mockRunWebUI.mock.calls[0]?.[0] as { serverOptions: { selectedHarness?: string } };
+    expect(webUiArgs.serverOptions.selectedHarness).toBe('my-harness');
+  });
+
+  it('returns early without launching the web UI when the picker is cancelled', async () => {
+    mockIsDeploySkippable.mockResolvedValue(false);
+    // Picker resolves with no selection (waitUntilExit resolves, onLaunchBrowser never fires).
+    driveDevScreen(() => undefined);
+
+    await launchBrowserDev();
+
+    expect(mockRunCliDeploy).not.toHaveBeenCalled();
+    expect(mockRunWebUI).not.toHaveBeenCalled();
+  });
+});
diff --git a/src/cli/commands/dev/browser-mode.ts b/src/cli/commands/dev/browser-mode.ts
index b40600e21..09cfec7a6 100644
--- a/src/cli/commands/dev/browser-mode.ts
+++ b/src/cli/commands/dev/browser-mode.ts
@@ -15,7 +15,6 @@ import { listMemoryRecords, retrieveMemoryRecords } from '../../operations/memor
 import { loadDeployedProjectConfig, resolveAgentOrHarness } from '../../operations/resolve-agent';
 import { fetchTraceRecords, listTraces } from '../../operations/traces';
 import { LayoutProvider } from '../../tui/context';
-import { runCliDeploy } from '../deploy/progress';
 import { render } from 'ink';
 import path from 'node:path';
 import React from 'react';
@@ -133,15 +132,31 @@ export async function launchBrowserDev(): Promise<void> {
     process.exit(1);
   }
 
-  // Only auto-deploy for harness-only projects, and skip if no CDK changes
-  if (hasHarnesses && !hasRuntimes && !(await isDeploySkippable())) {
-    await runCliDeploy();
-  }
-
   const configRoot = findConfigRoot(workingDir);
   const persistTracesDir = path.join(configRoot ?? workingDir, '.cli', 'traces');
   const { collector, otelEnvVars } = await startOtelCollector(persistTracesDir);
 
+  // Only auto-deploy for harness-only projects, and skip if no CDK changes.
+  // Show deploy progress inside the alt-screen DevScreen TUI (the same path
+  // `agentcore dev` uses) instead of plain inline console output, so both
+  // entry points render identically.
+  if (hasHarnesses && !hasRuntimes && !(await isDeploySkippable())) {
+    const pickerResult = await launchTuiDevScreenWithPicker(workingDir);
+    if (pickerResult == null) {
+      return;
+    }
+    await runBrowserMode({
+      workingDir,
+      project,
+      port: 8080,
+      agentName: pickerResult.agentName,
+      harnessName: pickerResult.harnessName,
+      otelEnvVars,
+      collector,
+    });
+    return;
+  }
+
   await runBrowserMode({
     workingDir,
     project,