diff --git a/tests/entrypoints/launchers/test_cli_args.py b/tests/entrypoints/launchers/test_cli_args.py
index 6b9d496822..84279e1555 100644
--- a/tests/entrypoints/launchers/test_cli_args.py
+++ b/tests/entrypoints/launchers/test_cli_args.py
@@ -242,7 +242,7 @@ def test_rust_grpc_port_requires_serve_subcommand(monkeypatch):
         validate_parsed_serve_args(args)
 
 
-def test_enable_auto_choice_passes_without_tool_call_parser(serve_parser):
+def test_enable_auto_choice_fails_without_tool_call_parser(serve_parser):
     """Ensure validation fails if tool choice is enabled with no call parser."""
     # If we enable-auto-tool-choice, explode with no tool-call-parser
     args = serve_parser.parse_args(args=["--enable-auto-tool-choice"])
@@ -262,17 +262,23 @@ def test_enable_auto_choice_passes_with_tool_call_parser(serve_parser):
     validate_parsed_serve_args(args)
 
 
-def test_enable_auto_choice_fails_with_enable_reasoning(serve_parser):
-    """Ensure validation fails if reasoning is enabled with auto tool choice."""
+def test_auto_tool_choice_with_reasoning_parser_passes(serve_parser):
+    """Auto tool choice combined with a reasoning parser is supported.
+
+    See docs/features/tool_calling.md, which documents using
+    ``--tool-call-parser`` together with ``--reasoning-parser``. This
+    combination must pass validation as long as a tool call parser is set.
+    """
     args = serve_parser.parse_args(
         args=[
             "--enable-auto-tool-choice",
+            "--tool-call-parser",
+            "mistral",
             "--reasoning-parser",
             "deepseek_r1",
         ]
     )
-    with pytest.raises(TypeError):
-        validate_parsed_serve_args(args)
+    validate_parsed_serve_args(args)
 
 
 def test_passes_with_reasoning_parser(serve_parser):