fix(tui): require the native interactive client

nanobot/cli/agent.py

@@ -83,18 +83,21 @@ def agent(
     theme = theme.strip().lower()
     if theme not in {"auto", "dark", "light"}:
         raise typer.BadParameter("must be auto, dark, or light", param_hint="--theme")
-    native_tui = (
-        message is None
-        and not classic
-        and markdown
-        and not logs
-        and sys.stdin.isatty()
-        and sys.stdout.isatty()
-    )
+    native_tui = message is None and not classic
     if native_tui:
         from nanobot.cli.tui_launcher import TuiUnavailableError, launch_tui
         from nanobot.config.loader import get_config_path
 
+        if not sys.stdin.isatty() or not sys.stdout.isatty():
+            raise typer.BadParameter(
+                "the native TUI requires an interactive terminal; use --message for "
+                "one-shot input or --classic for the legacy prompt",
+                param_hint="terminal",
+            )
+        if not markdown:
+            raise typer.BadParameter("--no-markdown requires --classic", param_hint="--no-markdown")
+        if logs:
+            raise typer.BadParameter("--logs requires --classic", param_hint="--logs")
         try:
             exit_code = launch_tui(
                 runtime_config,
@@ -104,8 +107,9 @@ def agent(
                 theme=theme,
             )
         except TuiUnavailableError as exc:
-            console.print(f"[yellow]Native TUI unavailable: {exc}[/yellow]")
-            console.print("[dim]Falling back to the classic prompt.[/dim]")
+            console.print(f"[red]Native TUI unavailable: {exc}[/red]")
+            console.print("[dim]Use `nanobot agent --classic` only if you want the old prompt.[/dim]")
+            raise typer.Exit(1) from exc
         else:
             if exit_code:
                 raise typer.Exit(exit_code)

nanobot/cli/tui_launcher.py

@@ -123,11 +123,7 @@ def _resolve_tui_command() -> list[str]:
     source_dir = Path(__file__).resolve().parents[2] / "tui"
     bun = shutil.which("bun")
     if bun and (source_dir / "package.json").is_file():
-        if not (source_dir / "node_modules" / "@opentui" / "core").is_dir():
-            raise TuiUnavailableError(
-                f"TUI dependencies are missing; run `bun install --cwd {source_dir}`"
-            )
-        return [bun, str(source_dir / "src" / "index.ts")]
+        return _resolve_source_tui_command(source_dir, bun)
 
     downloaded = _download_release_tui(asset)
     if downloaded is not None:
@@ -139,6 +135,25 @@ def _resolve_tui_command() -> list[str]:
     )
 
 
+def _resolve_source_tui_command(source_dir: Path, bun: str) -> list[str]:
+    dependency = source_dir / "node_modules" / "@opentui" / "core"
+    try:
+        install = subprocess.run(
+            [bun, "install", "--frozen-lockfile"],
+            cwd=source_dir,
+            capture_output=True,
+            text=True,
+            check=False,
+        )
+    except OSError as exc:
+        raise TuiUnavailableError(f"could not install TUI dependencies: {exc}") from exc
+    if install.returncode != 0 or not dependency.is_dir():
+        detail = (install.stderr or install.stdout).strip().splitlines()
+        suffix = f": {detail[-1]}" if detail else ""
+        raise TuiUnavailableError(f"could not install TUI dependencies{suffix}")
+    return [bun, str(source_dir / "src" / "index.ts")]
+
+
 def _download_release_tui(asset: str) -> Path | None:
     """Install the version-matched release sidecar into nanobot's data directory."""
     if os.environ.get("NANOBOT_TUI_NO_DOWNLOAD") == "1":