diff --git a/gui_v6/engine_bridge.py b/gui_v6/engine_bridge.py
index b5f3b51..f2d4226 100644
--- a/gui_v6/engine_bridge.py
+++ b/gui_v6/engine_bridge.py
@@ -18,13 +18,20 @@ Aucune logique de détection ici : on orchestre uniquement.
 
 from __future__ import annotations
 
+import logging
 from dataclasses import dataclass
 from enum import Enum
 from pathlib import Path
-from typing import Any, Callable, Optional
+from typing import Any, Callable, Dict, Optional
+
+from engine_capabilities import capabilities_map
+
+log = logging.getLogger(__name__)
 
 ProcessFn = Callable[[Path, Path], dict]
 ManagerFactory = Callable[[], Any]
+# Fournisseur de capabilities : () -> {key: objet exposant `.available`/`.reason`}.
+CapsProvider = Callable[[], Dict[str, Any]]
 
 
 class ManagerState(str, Enum):
@@ -86,9 +93,12 @@ class NerManagers:
         self,
         settings: EngineSettings,
         factories: Optional[dict[str, ManagerFactory]] = None,
+        caps_provider: Optional[CapsProvider] = None,
     ) -> None:
         self._settings = settings
         self._factories = factories if factories is not None else _default_factories()
+        # Sonde « moteurs réellement embarqués » (injectable pour les tests).
+        self._caps_provider = caps_provider if caps_provider is not None else capabilities_map
         self._camembert: Any = None
         self._eds: Any = None
         self._gliner: Any = None
@@ -109,6 +119,43 @@ class NerManagers:
             "camembert_manager": self._camembert,
         }
 
+    def _apply_capability_guard(self) -> None:
+        """Désactive un moteur optionnel demandé mais non embarqué (fail-safe).
+
+        Empêche qu'un profil YAML forçant ``enable_eds``/``enable_gliner`` ne
+        déclenche un chargement voué à l'échec silencieux : si la sonde
+        ``engine_capabilities`` indique le moteur indisponible, on log un
+        warning et on force la désactivation dans les réglages runtime.
+
+        Best-effort : toute erreur de sonde laisse les réglages inchangés (les
+        ``try/except`` de chargement protègent déjà contre un crash). La sonde
+        reste légère (``find_spec``) — aucun import lourd ici.
+        """
+        requested = []
+        if self._settings.enable_eds:
+            requested.append(("eds", "EDS-Pseudo"))
+        if self._settings.enable_gliner:
+            requested.append(("gliner", "GLiNER"))
+        if not requested:
+            return
+        try:
+            caps = self._caps_provider()
+        except Exception:  # noqa: BLE001 — best-effort, ne jamais bloquer le load
+            return
+        for key, label in requested:
+            cap = caps.get(key) if hasattr(caps, "get") else None
+            if cap is not None and not getattr(cap, "available", False):
+                log.warning(
+                    "%s demandé par la configuration mais non embarqué dans "
+                    "cette version — désactivation forcée (%s)",
+                    label,
+                    getattr(cap, "reason", ""),
+                )
+                if key == "eds":
+                    self._settings.enable_eds = False
+                else:
+                    self._settings.enable_gliner = False
+
     def ensure_loaded(self) -> ManagerState:
         """Charge les managers requis si nécessaire. Idempotent, sans crash."""
         if not self._settings.use_local_ner:
@@ -118,6 +165,8 @@ class NerManagers:
             return self._state
 
         self._state = ManagerState.LOADING
+        # Garde-fou : ne jamais tenter de charger un moteur optionnel non embarqué.
+        self._apply_capability_guard()
         try:
             # CamemBERT-bio est le NER local principal (obligatoire si NER actif).
             self._camembert = self._factories["camembert"]()
diff --git a/tests/unit/test_gui_v6_engine_bridge.py b/tests/unit/test_gui_v6_engine_bridge.py
index 351e7f4..0e84540 100644
--- a/tests/unit/test_gui_v6_engine_bridge.py
+++ b/tests/unit/test_gui_v6_engine_bridge.py
@@ -126,6 +126,89 @@ def test_optional_manager_failure_is_tolerated():
     assert managers.use_hf is True
 
 
+# -- garde-fou capabilities runtime ----------------------------------------
+
+
+class _FakeCap:
+    """Capability minimale pour injecter une sonde dans les tests."""
+
+    def __init__(self, available, reason="(test)"):
+        self.available = available
+        self.reason = reason
+
+
+def _caps_provider(eds_ok, gliner_ok):
+    def provider():
+        return {
+            "camembert": _FakeCap(True),
+            "eds": _FakeCap(eds_ok),
+            "gliner": _FakeCap(gliner_ok),
+        }
+
+    return provider
+
+
+def test_guard_disables_unavailable_eds_before_load():
+    # Profil/config forçant EDS alors que le moteur n'est pas embarqué.
+    settings = EngineSettings(enable_eds=True)
+    counter = {"camembert": 0, "eds": 0, "gliner": 0}
+    managers = NerManagers(
+        settings,
+        factories=_counting_factories(counter),
+        caps_provider=_caps_provider(eds_ok=False, gliner_ok=True),
+    )
+    assert managers.ensure_loaded() == ManagerState.READY
+    assert settings.enable_eds is False  # désactivation forcée
+    assert counter["eds"] == 0  # jamais tenté de charger
+    assert managers.as_kwargs()["ner_manager"] is None
+
+
+def test_guard_disables_unavailable_gliner_before_load():
+    settings = EngineSettings(enable_gliner=True)
+    counter = {"camembert": 0, "eds": 0, "gliner": 0}
+    managers = NerManagers(
+        settings,
+        factories=_counting_factories(counter),
+        caps_provider=_caps_provider(eds_ok=True, gliner_ok=False),
+    )
+    assert managers.ensure_loaded() == ManagerState.READY
+    assert settings.enable_gliner is False
+    assert counter["gliner"] == 0
+    assert managers.as_kwargs()["gliner_manager"] is None
+
+
+def test_guard_keeps_available_engine_enabled():
+    settings = EngineSettings(enable_eds=True, enable_gliner=True)
+    counter = {"camembert": 0, "eds": 0, "gliner": 0}
+    managers = NerManagers(
+        settings,
+        factories=_counting_factories(counter),
+        caps_provider=_caps_provider(eds_ok=True, gliner_ok=True),
+    )
+    assert managers.ensure_loaded() == ManagerState.READY
+    assert settings.enable_eds is True
+    assert settings.enable_gliner is True
+    assert counter["eds"] == 1
+    assert counter["gliner"] == 1
+
+
+def test_guard_failsafe_when_probe_raises():
+    settings = EngineSettings(enable_eds=True)
+    counter = {"camembert": 0, "eds": 0, "gliner": 0}
+
+    def boom():
+        raise RuntimeError("probe ko")
+
+    managers = NerManagers(
+        settings, factories=_counting_factories(counter), caps_provider=boom
+    )
+    # Best-effort : une sonde en échec ne bloque pas le chargement et ne
+    # modifie pas les réglages (les try/except de load protègent déjà).
+    assert managers.ensure_loaded() == ManagerState.READY
+    assert settings.enable_eds is True
+    assert counter["eds"] == 1
+
+
 # -- make_process_fn -------------------------------------------------------
 
 def test_process_fn_calls_engine_with_kwargs(tmp_path):