feat(code): add -s alias for --skill (#4620)

`dcode` now accepts `-s` as a short alias for `--skill`, e.g. `dcode -s
code-review -m 'review this patch'`.

---

`-s` was previously unused across the entire `dcode` CLI surface (no
top-level flag or subparser claimed it), so it's a safe, ergonomic alias
for the existing `--skill` startup flag. This gives skill invocation the
same short-flag convenience as other common options and makes `dcode -s
<name> [-m task]` a quick way to auto-invoke a skill at startup.

Made by [Open
SWE](https://openswe.vercel.app/agents/577c1ebd-4ca4-47db-8244-99b4d2f15112)

Co-authored-by: Harrison Chase <11986836+hwchase17@users.noreply.github.com>
Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

libs/code/deepagents_code/main.py

@@ -1533,6 +1533,7 @@ def parse_args() -> argparse.Namespace:
     )
 
     parser.add_argument(
+        "-s",
         "--skill",
         dest="initial_skill",
         metavar="NAME",

libs/code/deepagents_code/tui/widgets/startup_tip.py

@@ -34,6 +34,7 @@ _TIPS: dict[str, int] = {
     "In /agents, press Ctrl+S to set the highlighted agent as your default": 1,
     "Press Shift+Tab to toggle auto-approve mode": 2,
     "Use --startup-cmd to run a shell command before the first prompt": 1,
+    "Launch with dcode -s <name> to auto-invoke a skill at startup": 1,
     "Use !! for incognito shell commands that stay out of model context": 1,
     "Deep Agents can explain its own features and look up its docs. Ask it how to use.": 3,  # noqa: E501
 }

libs/code/deepagents_code/ui.py

@@ -135,7 +135,7 @@ def show_help() -> None:
     )
     console.print("  --profile-override JSON    Override model profile fields as JSON")
     console.print("  -m, --message TEXT         Initial prompt to auto-submit on start")
-    console.print("  --skill NAME               Invoke a skill when the session starts")
+    console.print("  -s, --skill NAME           Invoke a skill when the session starts")
     console.print(
         "  --startup-cmd CMD          Shell command to run at startup, before first prompt"  # noqa: E501
     )

libs/code/tests/unit_tests/test_args.py

@@ -58,6 +58,12 @@ class TestInitialSkillArg:
             args = parse_args()
         assert args.initial_skill == "code-review"
 
+    def test_short_flag_sets_initial_skill(self) -> None:
+        """Verify `-s` is an alias for `--skill`."""
+        with patch.object(sys, "argv", ["deepagents", "-s", "code-review"]):
+            args = parse_args()
+        assert args.initial_skill == "code-review"
+
     def test_with_message(self) -> None:
         """Verify `--skill` works alongside `-m`."""
         with patch.object(