diff --git a/cli/constants.py b/cli/constants.py
index f3471a6..d1c2188 100644
--- a/cli/constants.py
+++ b/cli/constants.py
@@ -155,32 +155,36 @@ def get_completions(self, document, complete_event):
 
         for cmd, desc in SLASH_COMMANDS.items():
             if cmd.startswith(partial):
-                padded_cmd = cmd[1:].ljust(16)
-                safe_desc = _xml_escape(desc)
-                yield Completion(
-                    cmd,
-                    start_position=-len(text),
-                    display=HTML(
-                        f"<command>{padded_cmd}</command><description>{safe_desc}</description>"
-                    ),
-                    display_meta=desc,
-                )
+                yield self._command_completion(cmd, cmd[1:], desc, desc, text)
 
         if self._skill_manager:
             for skill in self._skill_manager.list_skills():
                 skill_cmd = f"/{skill['name']}"
                 if skill_cmd.startswith(partial) and skill_cmd not in SLASH_COMMANDS:
-                    padded_cmd = skill["name"].ljust(16)
-                    safe_desc = _xml_escape(skill["description"])
-                    yield Completion(
+                    yield self._command_completion(
                         skill_cmd,
-                        start_position=-len(text),
-                        display=HTML(
-                            f"<command>{padded_cmd}</command><description>{safe_desc}</description>"
-                        ),
-                        display_meta=f"skill: {skill['description']}",
+                        skill["name"],
+                        skill["description"],
+                        f"skill: {skill['description']}",
+                        text,
                     )
 
+    @staticmethod
+    def _command_completion(cmd: str, label: str, desc: str, meta: str, typed: str) -> Completion:
+        # prompt_toolkit hides a completion that is identical to the text already typed, so the
+        # dropdown (and the command's description) vanished the moment you finished typing `/cost`.
+        # On an exact match offer "<cmd> " instead: it differs, so the entry stays visible, and a
+        # trailing space is where arguments start anyway.
+        insert = cmd + " " if cmd == typed.lower() else cmd
+        return Completion(
+            insert,
+            start_position=-len(typed),
+            display=HTML(
+                f"<command>{label.ljust(16)}</command><description>{_xml_escape(desc)}</description>"
+            ),
+            display_meta=meta,
+        )
+
 
 def _path_completions_for(partial: str, limit: int = 30):
     """Yield (completion_text, is_dir) for paths matching a partial @mention."""
diff --git a/tests/test_boxed_input.py b/tests/test_boxed_input.py
index 965d506..879a941 100644
--- a/tests/test_boxed_input.py
+++ b/tests/test_boxed_input.py
@@ -191,3 +191,19 @@ def test_empty_prompt_is_one_line_and_toolbar_shows_the_mode(cols):
     assert "[ASK]" in lines[-1], "mode clipped off the toolbar"  # the reported bug
     if cols >= 60:
         assert "tok" in lines[-1]
+
+
+def test_dropdown_stays_open_when_the_command_is_fully_typed():
+    # regression: typing `/cos` showed the dropdown but `/cost` hid it
+    for text in ("/cos", "/cost", "/models"):
+        lines = render_live(
+            text,
+            rows=12,
+            wait=0.5,
+            completer=SlashCommandCompleter(),
+            complete_while_typing=True,
+            **common(Holder()),
+        )
+        menu = [line for line in lines[2:] if line.strip()]
+        assert menu, f"dropdown vanished at {text!r}"
+        assert menu[0].strip().startswith(text[1:]), menu
diff --git a/tests/test_prompt_ui.py b/tests/test_prompt_ui.py
index b2b3598..c8ca4f7 100644
--- a/tests/test_prompt_ui.py
+++ b/tests/test_prompt_ui.py
@@ -229,3 +229,59 @@ def test_clear_screen_only_on_a_real_terminal():
 def test_clear_screen_can_be_disabled_with_env():
     assert not should_clear_screen(True, env={"DEVORCH_NO_CLEAR": "1"})
     assert should_clear_screen(True, env={"DEVORCH_NO_CLEAR": ""})
+
+
+# ── slash dropdown stays visible on an exact match ──────────────────────────
+
+from prompt_toolkit.document import Document  # noqa: E402
+
+from cli.constants import SLASH_COMMANDS, SlashCommandCompleter  # noqa: E402
+
+
+def _complete(text):
+    return [c.text for c in SlashCommandCompleter().get_completions(Document(text), None)]
+
+
+@pytest.mark.parametrize("cmd", list(SLASH_COMMANDS))
+def test_every_command_keeps_a_dropdown_entry_as_you_finish_typing_it(cmd):
+    # prompt_toolkit hides a completion identical to the typed text; the entry must differ from it
+    for i in range(2, len(cmd) + 1):
+        typed = cmd[:i]
+        entries = _complete(typed)
+        assert entries, f"dropdown empty at {typed!r}"
+        assert all(e != typed for e in entries), (
+            f"identical completion at {typed!r} would be hidden"
+        )
+    assert cmd + " " in _complete(cmd)
+
+
+def test_exact_match_inserts_a_trailing_space_other_matches_do_not():
+    assert _complete("/cost") == ["/cost "]
+    assert "/mode " in _complete("/mode") and "/models" in _complete("/mode")
+
+
+def test_no_dropdown_once_arguments_start():
+    assert _complete("/cost ") == []
+    assert _complete("/model gpt") == []
+
+
+def test_exact_match_is_case_insensitive():
+    assert _complete("/COST") == ["/cost "]
+
+
+def test_enter_on_an_exact_match_submits_the_typed_text_unchanged():
+    assert (
+        run_prompt("/cost\r", completer=SlashCommandCompleter(), complete_while_typing=True)
+        == "/cost"
+    )
+
+
+def test_skills_also_keep_their_dropdown_entry():
+    class Skills:
+        def list_skills(self):
+            return [{"name": "deploy", "description": "Deploy it"}]
+
+    comps = [
+        c.text for c in SlashCommandCompleter(Skills()).get_completions(Document("/deploy"), None)
+    ]
+    assert comps == ["/deploy "]