fix(cli): validate user-defined providers consistently

tests/hermes_cli/test_doctor.py

@@ -3,6 +3,8 @@
 import os
 import sys
 import types
+import io
+import contextlib
 from argparse import Namespace
 from types import SimpleNamespace
 
@@ -255,6 +257,57 @@ def test_run_doctor_termux_treats_docker_and_browser_warnings_as_expected(monkey
     assert "docker not found (optional)" not in out
 
 
+def test_run_doctor_accepts_named_provider_from_providers_section(monkeypatch, tmp_path):
+    home = tmp_path / ".hermes"
+    home.mkdir(parents=True, exist_ok=True)
+
+    import yaml
+
+    (home / "config.yaml").write_text(
+        yaml.dump(
+            {
+                "model": {
+                    "provider": "volcengine-plan",
+                    "default": "doubao-seed-2.0-code",
+                },
+                "providers": {
+                    "volcengine-plan": {
+                        "name": "volcengine-plan",
+                        "base_url": "https://ark.cn-beijing.volces.com/api/coding/v3",
+                        "default_model": "doubao-seed-2.0-code",
+                        "models": {"doubao-seed-2.0-code": {}},
+                    }
+                },
+            }
+        )
+    )
+
+    monkeypatch.setattr(doctor_mod, "HERMES_HOME", home)
+    monkeypatch.setattr(doctor_mod, "PROJECT_ROOT", tmp_path / "project")
+    monkeypatch.setattr(doctor_mod, "_DHH", str(home))
+    (tmp_path / "project").mkdir(exist_ok=True)
+
+    fake_model_tools = types.SimpleNamespace(
+        check_tool_availability=lambda *a, **kw: ([], []),
+        TOOLSET_REQUIREMENTS={},
+    )
+    monkeypatch.setitem(sys.modules, "model_tools", fake_model_tools)
+
+    try:
+        from hermes_cli import auth as _auth_mod
+        monkeypatch.setattr(_auth_mod, "get_nous_auth_status", lambda: {})
+        monkeypatch.setattr(_auth_mod, "get_codex_auth_status", lambda: {})
+    except Exception:
+        pass
+
+    buf = io.StringIO()
+    with contextlib.redirect_stdout(buf):
+        doctor_mod.run_doctor(Namespace(fix=False))
+
+    out = buf.getvalue()
+    assert "model.provider 'volcengine-plan' is not a recognised provider" not in out
+
+
 def test_run_doctor_termux_does_not_mark_browser_available_without_agent_browser(monkeypatch, tmp_path):
     home = tmp_path / ".hermes"
     home.mkdir(parents=True, exist_ok=True)