diff --git a/atmn/src/cli.tsx b/atmn/src/cli.tsx
index 47f289a..2da3b7f 100644
--- a/atmn/src/cli.tsx
+++ b/atmn/src/cli.tsx
@@ -10,10 +10,12 @@ import { pull as newPull } from "./commands/pull/pull.js"; // New pull implement
 import { FRONTEND_URL } from "./constants.js";
 import { fetchOrganizationMe } from "./lib/api/endpoints/index.js";
 import { isProd, setCliContext } from "./lib/env/cliContext.js";
+import { checkAtmnInstalled } from "./lib/precheck.js";
 import { readFromEnv } from "./lib/utils.js";
 // Import Ink views
 import { QueryProvider } from "./views/react/components/providers/QueryProvider.js";
 import { InitFlow } from "./views/react/init/InitFlow.js";
+import { InstallPrompt } from "./views/react/install/InstallPrompt.js";
 import { PullView } from "./views/react/pull/Pull.js";
 import { APP_VERSION } from "./lib/version.js";
 
@@ -450,4 +452,13 @@ const originalEmit = process.emitWarning as any;
 	return originalEmit(warning, ...args);
 };
 
-program.parse();
+async function main() {
+	if (!checkAtmnInstalled() && process.stdout.isTTY) {
+		const { waitUntilExit } = render(<InstallPrompt />);
+		await waitUntilExit();
+	}
+
+	program.parse();
+}
+
+main();
diff --git a/atmn/src/lib/precheck.ts b/atmn/src/lib/precheck.ts
new file mode 100644
index 0000000..26ff270
--- /dev/null
+++ b/atmn/src/lib/precheck.ts
@@ -0,0 +1,23 @@
+import fs from "fs";
+import path from "path";
+
+/**
+ * Check if `atmn` is listed in the project's package.json
+ * (dependencies or devDependencies). This ensures autumn.config.ts
+ * can import from "atmn" without type errors.
+ */
+export function checkAtmnInstalled(): boolean {
+	try {
+		const packageJsonPath = path.join(process.cwd(), "package.json");
+		if (!fs.existsSync(packageJsonPath)) {
+			return false;
+		}
+
+		const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, "utf-8"));
+		return !!(
+			packageJson.dependencies?.atmn || packageJson.devDependencies?.atmn
+		);
+	} catch {
+		return false;
+	}
+}
diff --git a/atmn/src/views/react/install/InstallPrompt.tsx b/atmn/src/views/react/install/InstallPrompt.tsx
new file mode 100644
index 0000000..b772ad2
--- /dev/null
+++ b/atmn/src/views/react/install/InstallPrompt.tsx
@@ -0,0 +1,95 @@
+import { execSync } from "child_process";
+import { Box, Text, useApp } from "ink";
+import { useCallback, useState } from "react";
+import {
+	SelectMenu,
+	type SelectMenuItem,
+	StatusLine,
+} from "../components/index.js";
+
+type PackageManager = "npm" | "pnpm" | "bun";
+type InstallState = "choosing" | "installing" | "success" | "skipped";
+
+export function InstallPrompt() {
+	const { exit } = useApp();
+	const [state, setState] = useState<InstallState>("choosing");
+	const [error, setError] = useState<string | null>(null);
+
+	const items: SelectMenuItem<PackageManager>[] = [
+		{ label: "npm", value: "npm" },
+		{ label: "pnpm", value: "pnpm" },
+		{ label: "bun", value: "bun" },
+	];
+
+	const handleSelect = useCallback(
+		(item: SelectMenuItem<PackageManager>) => {
+			setState("installing");
+
+			const commands: Record<PackageManager, string> = {
+				npm: "npm install atmn",
+				pnpm: "pnpm add atmn",
+				bun: "bun add atmn",
+			};
+
+			try {
+				execSync(commands[item.value], { stdio: "inherit" });
+				setState("success");
+				setTimeout(() => exit(), 500);
+			} catch (err) {
+				setError(
+					err instanceof Error ? err.message : "Installation failed",
+				);
+			}
+		},
+		[exit],
+	);
+
+	if (error) {
+		return (
+			<Box flexDirection="column" paddingLeft={1}>
+				<StatusLine status="error" message={`Failed to install atmn: ${error}`} />
+				<Text dimColor>
+					Install manually: npm install atmn / pnpm add atmn / bun add atmn
+				</Text>
+			</Box>
+		);
+	}
+
+	return (
+		<Box flexDirection="column" paddingLeft={1}>
+			<Box marginBottom={1}>
+				<Text>
+					<Text color="yellow">!</Text> The{" "}
+					<Text color="magenta" bold>
+						atmn
+					</Text>{" "}
+					package is not in your dependencies.
+				</Text>
+			</Box>
+			<Text dimColor>
+				It's needed so autumn.config.ts can import types and builders.
+			</Text>
+
+			{state === "choosing" && (
+				<Box flexDirection="column" marginTop={1}>
+					<Text>Install with:</Text>
+					<Box marginTop={1}>
+						<SelectMenu items={items} onSelect={handleSelect} />
+					</Box>
+				</Box>
+			)}
+
+			{state === "installing" && (
+				<Box marginTop={1}>
+					<StatusLine status="loading" message="Installing atmn..." />
+				</Box>
+			)}
+
+			{state === "success" && (
+				<Box marginTop={1}>
+					<StatusLine status="success" message="atmn installed" />
+				</Box>
+			)}
+		</Box>
+	);
+}