Enable submission download.

src/endpoints_submission_cli/commands/submissions/get.py

@@ -5,6 +5,7 @@
 from __future__ import annotations
 
 import sys
+from pathlib import Path
 
 import click
 
@@ -18,14 +19,22 @@
 
 @click.command("get")
 @click.option("--submission-id", required=True, help="Submission UUID.")
+@click.option(
+    "--download-to",
+    default=None,
+    type=click.Path(file_okay=False),
+    help="Download the submission archive (.tar.gz) to this directory.",
+)
 @click.option(
     "--token",
     envvar="PRISM_USER_API_TOKEN",
     default=None,
     help="PRISM API key (mlc_...).",
 )
 @click.option("-j", "--json", "as_json", is_flag=True, default=False, help="Output raw JSON.")
-def submissions_get(submission_id: str, token: str | None, as_json: bool) -> None:
+def submissions_get(
+    submission_id: str, download_to: str | None, token: str | None, as_json: bool
+) -> None:
     """Get full submission details including embedded runs."""
     resolved_token = _get_token(token)
     try:
@@ -38,3 +47,13 @@ def submissions_get(submission_id: str, token: str | None, as_json: bool) -> Non
         output_json(sub)
     else:
         print_submission_detail(sub)
+
+    if download_to is not None:
+        try:
+            dest = subs_api.download_submission_archive(
+                resolved_token, submission_id, Path(download_to)
+            )
+        except APIError as exc:
+            _console.print(f"[bold red]Error:[/bold red] {exc}")
+            sys.exit(1)
+        _console.print(f"Archive saved to [bold]{dest}[/bold]")

tests/endpoints_submission_cli/commands/test_submissions_commands.py

@@ -101,6 +101,55 @@ def test_get_api_error_exits_1(self) -> None:
                 )
         assert result.exit_code == 1
 
+    def test_get_download_to_saves_archive(self, tmp_path: Path) -> None:
+        archive = tmp_path / f"{SUBMISSION_ID}.tar.gz"
+        with patch(
+            "endpoints_submission_cli.submissions.api.get_submission", return_value=SUBMISSION_OUT
+        ):
+            with patch(
+                "endpoints_submission_cli.submissions.api.download_submission_archive",
+                return_value=archive,
+            ) as mock_dl:
+                with patch("endpoints_submission_cli._http.get_token", return_value=TOKEN):
+                    result = _runner.invoke(
+                        app,
+                        [
+                            "submissions",
+                            "get",
+                            "--submission-id",
+                            SUBMISSION_ID,
+                            "--download-to",
+                            str(tmp_path),
+                            *_TOKEN_ARGS,
+                        ],
+                    )
+        assert result.exit_code == 0
+        mock_dl.assert_called_once_with(TOKEN, SUBMISSION_ID, tmp_path)
+        assert "Archive saved to" in result.output
+
+    def test_get_download_api_error_exits_1(self, tmp_path: Path) -> None:
+        with patch(
+            "endpoints_submission_cli.submissions.api.get_submission", return_value=SUBMISSION_OUT
+        ):
+            with patch(
+                "endpoints_submission_cli.submissions.api.download_submission_archive",
+                side_effect=APIError("download failed"),
+            ):
+                with patch("endpoints_submission_cli._http.get_token", return_value=TOKEN):
+                    result = _runner.invoke(
+                        app,
+                        [
+                            "submissions",
+                            "get",
+                            "--submission-id",
+                            SUBMISSION_ID,
+                            "--download-to",
+                            str(tmp_path),
+                            *_TOKEN_ARGS,
+                        ],
+                    )
+        assert result.exit_code == 1
+
 
 @pytest.mark.unit
 class TestSubmissionsUpdate: