diff --git a/agent_v0/agent_v1/core/captor.py b/agent_v0/agent_v1/core/captor.py
index 4dcd9392f..77d3b99dc 100644
--- a/agent_v0/agent_v1/core/captor.py
+++ b/agent_v0/agent_v1/core/captor.py
@@ -178,8 +178,41 @@ class EventCaptorV1:
             "timestamp": now,
         }
         self._inject_screen_metadata(event)
+        # Capturer le snapshot UIA à la position du clic (si helper dispo)
+        # Non-bloquant : si UIA échoue, l'event est enrichi uniquement
+        # des données vision comme aujourd'hui.
+        self._inject_uia_snapshot(event, x, y)
         self.on_event(event)
 
+    def _inject_uia_snapshot(self, event: dict, x: int, y: int) -> None:
+        """Ajouter un uia_snapshot à l'événement si le helper UIA est dispo.
+
+        Appelle lea_uia.exe query --x N --y N en ~10-20ms.
+        Fallback silencieux si le helper n'est pas dispo ou échoue.
+        """
+        try:
+            from .uia_helper import get_shared_helper
+            helper = get_shared_helper()
+            if not helper.available:
+                return
+            element = helper.query_at(int(x), int(y), with_parents=True)
+            if element is None:
+                return
+            event["uia_snapshot"] = {
+                "name": element.name,
+                "control_type": element.control_type,
+                "class_name": element.class_name,
+                "automation_id": element.automation_id,
+                "bounding_rect": list(element.bounding_rect),
+                "is_enabled": element.is_enabled,
+                "is_offscreen": element.is_offscreen,
+                "parent_path": element.parent_path,
+            }
+        except Exception as e:
+            # Non bloquant — on continue sans UIA
+            import logging
+            logging.getLogger(__name__).debug(f"UIA snapshot skip: {e}")
+
     def _on_scroll(self, x, y, dx, dy):
         event = {
             "type": "mouse_scroll",
diff --git a/agent_v0/agent_v1/core/executor.py b/agent_v0/agent_v1/core/executor.py
index c50256b58..f6d14dc46 100644
--- a/agent_v0/agent_v1/core/executor.py
+++ b/agent_v0/agent_v1/core/executor.py
@@ -264,6 +264,59 @@ class ActionExecutorV1:
             logger.warning(f"Acteur gemma4 indisponible : {e}")
             return "EXECUTER"
 
+    # =========================================================================
+    # UIA local — résolution via lea_uia.exe (helper Rust)
+    # =========================================================================
+
+    def _resolve_via_uia_local(
+        self, uia_target: dict, screen_width: int, screen_height: int,
+    ):
+        """Résoudre une cible via UIA local (lea_uia.exe).
+
+        Le plan V4 contient un uia_target (nom, control_type, parent_path).
+        On appelle le helper Rust qui interroge UIAutomationCore.dll et
+        retourne les coordonnées pixel-perfect de l'élément.
+
+        Retourne (x_pct, y_pct) si trouvé, None sinon.
+        Le fallback vers le grounding serveur est géré par l'appelant.
+        """
+        try:
+            from .uia_helper import get_shared_helper
+            helper = get_shared_helper()
+            if not helper.available:
+                return None
+
+            name = uia_target.get("name", "")
+            control_type = uia_target.get("control_type", "") or None
+            automation_id = uia_target.get("automation_id", "") or None
+
+            if not name:
+                return None
+
+            element = helper.find_by_name(
+                name=name,
+                control_type=control_type,
+                automation_id=automation_id,
+                timeout_ms=1500,
+            )
+            if element is None or not element.is_clickable():
+                return None
+
+            cx, cy = element.center()
+            if screen_width <= 0 or screen_height <= 0:
+                return None
+
+            x_pct = cx / screen_width
+            y_pct = cy / screen_height
+            if not (0.0 <= x_pct <= 1.0 and 0.0 <= y_pct <= 1.0):
+                return None
+
+            return (x_pct, y_pct)
+
+        except Exception as e:
+            logger.debug(f"UIA local resolve erreur : {e}")
+            return None
+
     # =========================================================================
     # Observer — pré-analyse écran avant chaque action
     # =========================================================================
@@ -506,8 +559,29 @@ class ActionExecutorV1:
                             return result
                         # EXECUTER → continuer normalement
 
-            if visual_mode and target_spec and server_url:
-                # ── GROUNDING : localisation pure via GroundingEngine ──
+            # ── V4 : UIA local (si resolve_order l'indique et helper dispo) ──
+            # Court-circuite le grounding serveur pour les clicks sur Windows natif.
+            # 10-20ms au lieu de 2-5s pour un clic — c'est le cœur du V4.
+            uia_resolved = False
+            if visual_mode and target_spec and action_type == "click":
+                resolve_order = target_spec.get("resolve_order", [])
+                uia_target = target_spec.get("uia_target")
+                if resolve_order and resolve_order[0] == "uia" and uia_target:
+                    uia_coords = self._resolve_via_uia_local(uia_target, width, height)
+                    if uia_coords:
+                        x_pct, y_pct = uia_coords
+                        result["visual_resolved"] = True
+                        result["resolution_method"] = "v4_uia_local"
+                        result["resolution_score"] = 0.95
+                        uia_resolved = True
+                        print(f"    [UIA] résolu en local: ({x_pct:.4f}, {y_pct:.4f})")
+                        logger.info(
+                            f"V4 UIA local OK : {uia_target.get('name', '?')} "
+                            f"→ ({x_pct:.4f}, {y_pct:.4f})"
+                        )
+
+            if not uia_resolved and visual_mode and target_spec and server_url:
+                # ── GROUNDING : localisation pure via GroundingEngine (fallback) ──
                 from .grounding import GroundingEngine
                 grounding = GroundingEngine(self)
                 grounding_result = grounding.locate(
diff --git a/agent_v0/agent_v1/core/uia_helper.py b/agent_v0/agent_v1/core/uia_helper.py
new file mode 100644
index 000000000..80061f853
--- /dev/null
+++ b/agent_v0/agent_v1/core/uia_helper.py
@@ -0,0 +1,278 @@
+# core/workflow/uia_helper.py
+"""
+UIAHelper — Wrapper Python pour lea_uia.exe (helper Rust UI Automation).
+
+Expose une API Python simple pour interroger UIA via le binaire Rust.
+Communique via subprocess + stdin/stdout JSON.
+
+Pourquoi un helper Rust ?
+- 5-10x plus rapide que pywinauto (10-20ms vs 50-200ms)
+- Binaire standalone ~500 Ko, aucune dépendance runtime
+- Pas de problèmes de threading COM en Python
+- Crash-safe (le crash du helper n'affecte pas l'agent Python)
+
+Architecture :
+    Python executor
+        ↓ subprocess.run
+    lea_uia.exe query --x 812 --y 436
+        ↓ UIA API Windows
+    JSON response
+        ↓ stdout
+    Python executor parse JSON
+
+Si lea_uia.exe n'est pas disponible (Linux, binaire absent, crash) :
+toutes les méthodes retournent None → fallback vision automatique.
+"""
+
+import json
+import logging
+import os
+import platform
+import subprocess
+from dataclasses import dataclass, field
+from typing import Any, Dict, List, Optional, Tuple
+
+logger = logging.getLogger(__name__)
+
+# Timeout par défaut pour les appels UIA (en secondes)
+_DEFAULT_TIMEOUT = 5.0
+
+
+@dataclass
+class UiaElement:
+    """Représentation Python d'un élément UIA."""
+    name: str = ""
+    control_type: str = ""
+    class_name: str = ""
+    automation_id: str = ""
+    bounding_rect: Tuple[int, int, int, int] = (0, 0, 0, 0)
+    is_enabled: bool = False
+    is_offscreen: bool = True
+    parent_path: List[Dict[str, str]] = field(default_factory=list)
+    process_name: str = ""
+
+    def center(self) -> Tuple[int, int]:
+        """Retourner le centre du rectangle (pixels)."""
+        x1, y1, x2, y2 = self.bounding_rect
+        return ((x1 + x2) // 2, (y1 + y2) // 2)
+
+    def width(self) -> int:
+        return self.bounding_rect[2] - self.bounding_rect[0]
+
+    def height(self) -> int:
+        return self.bounding_rect[3] - self.bounding_rect[1]
+
+    def is_clickable(self) -> bool:
+        """Peut-on cliquer dessus ?"""
+        return (
+            self.is_enabled
+            and not self.is_offscreen
+            and self.width() > 0
+            and self.height() > 0
+        )
+
+    def path_signature(self) -> str:
+        """Signature du chemin parent (pour retrouver l'élément)."""
+        parts = [f"{p['control_type']}[{p['name']}]" for p in self.parent_path if p.get("name")]
+        parts.append(f"{self.control_type}[{self.name}]")
+        return " > ".join(parts)
+
+    def to_dict(self) -> Dict[str, Any]:
+        return {
+            "name": self.name,
+            "control_type": self.control_type,
+            "class_name": self.class_name,
+            "automation_id": self.automation_id,
+            "bounding_rect": list(self.bounding_rect),
+            "is_enabled": self.is_enabled,
+            "is_offscreen": self.is_offscreen,
+            "parent_path": self.parent_path,
+            "process_name": self.process_name,
+        }
+
+    @classmethod
+    def from_dict(cls, d: Dict[str, Any]) -> "UiaElement":
+        rect = d.get("bounding_rect", [0, 0, 0, 0])
+        if isinstance(rect, list) and len(rect) >= 4:
+            rect = tuple(rect[:4])
+        else:
+            rect = (0, 0, 0, 0)
+        return cls(
+            name=d.get("name", ""),
+            control_type=d.get("control_type", ""),
+            class_name=d.get("class_name", ""),
+            automation_id=d.get("automation_id", ""),
+            bounding_rect=rect,
+            is_enabled=d.get("is_enabled", False),
+            is_offscreen=d.get("is_offscreen", True),
+            parent_path=d.get("parent_path", []),
+            process_name=d.get("process_name", ""),
+        )
+
+
+class UIAHelper:
+    """Wrapper Python pour lea_uia.exe."""
+
+    def __init__(self, helper_path: str = "", timeout: float = _DEFAULT_TIMEOUT):
+        self._helper_path = helper_path or self._find_helper()
+        self._timeout = timeout
+        self._available = self._check_available()
+
+    def _find_helper(self) -> str:
+        """Trouver lea_uia.exe dans les emplacements standards."""
+        candidates = [
+            r"C:\Lea\helpers\lea_uia.exe",
+            os.path.join(os.path.dirname(__file__), "..", "..",
+                         "agent_rust", "lea_uia", "target",
+                         "x86_64-pc-windows-gnu", "release", "lea_uia.exe"),
+            "./helpers/lea_uia.exe",
+            "lea_uia.exe",
+        ]
+        for path in candidates:
+            if os.path.isfile(path):
+                return os.path.abspath(path)
+        return ""
+
+    def _check_available(self) -> bool:
+        """Vérifier que le helper est utilisable (Windows + binaire + health OK)."""
+        if platform.system() != "Windows":
+            logger.debug("UIAHelper: Linux/Mac — helper désactivé")
+            return False
+        if not self._helper_path:
+            logger.debug("UIAHelper: lea_uia.exe introuvable")
+            return False
+        if not os.path.isfile(self._helper_path):
+            logger.debug(f"UIAHelper: chemin invalide {self._helper_path}")
+            return False
+        return True
+
+    @property
+    def available(self) -> bool:
+        return self._available
+
+    @property
+    def helper_path(self) -> str:
+        return self._helper_path
+
+    def _run(self, args: List[str]) -> Optional[Dict[str, Any]]:
+        """Exécuter lea_uia.exe avec les arguments et parser le JSON."""
+        if not self._available:
+            return None
+        try:
+            result = subprocess.run(
+                [self._helper_path] + args,
+                capture_output=True,
+                text=True,
+                timeout=self._timeout,
+                encoding="utf-8",
+                errors="replace",
+            )
+            if result.returncode != 0:
+                logger.debug(
+                    f"UIAHelper: exit code {result.returncode}, "
+                    f"stderr: {result.stderr[:200]}"
+                )
+                return None
+            output = result.stdout.strip()
+            if not output:
+                return None
+            return json.loads(output)
+        except subprocess.TimeoutExpired:
+            logger.debug(f"UIAHelper: timeout ({self._timeout}s) sur {args}")
+            return None
+        except json.JSONDecodeError as e:
+            logger.debug(f"UIAHelper: JSON invalide — {e}")
+            return None
+        except Exception as e:
+            logger.debug(f"UIAHelper: erreur {e}")
+            return None
+
+    def health(self) -> bool:
+        """Vérifier que UIA répond."""
+        data = self._run(["health"])
+        return data is not None and data.get("status") == "ok"
+
+    def query_at(
+        self,
+        x: int,
+        y: int,
+        with_parents: bool = True,
+    ) -> Optional[UiaElement]:
+        """Récupérer l'élément UIA à une position écran.
+
+        Args:
+            x, y: Coordonnées pixel absolues
+            with_parents: Inclure la hiérarchie des parents
+
+        Returns:
+            UiaElement si trouvé, None sinon (pas d'élément ou UIA indispo)
+        """
+        args = ["query", "--x", str(x), "--y", str(y)]
+        if not with_parents:
+            args.append("--with-parents=false")
+
+        data = self._run(args)
+        if not data or data.get("status") != "ok":
+            return None
+
+        elem_data = data.get("element")
+        if not elem_data:
+            return None
+        return UiaElement.from_dict(elem_data)
+
+    def find_by_name(
+        self,
+        name: str,
+        control_type: Optional[str] = None,
+        automation_id: Optional[str] = None,
+        window: Optional[str] = None,
+        timeout_ms: int = 2000,
+    ) -> Optional[UiaElement]:
+        """Rechercher un élément par son nom (+ filtres optionnels).
+
+        Args:
+            name: Nom exact de l'élément
+            control_type: Type de contrôle (Button, Edit, MenuItem...)
+            automation_id: ID d'automation
+            window: Restreindre à une fenêtre spécifique
+            timeout_ms: Timeout de recherche en millisecondes
+        """
+        args = ["find", "--name", name, "--timeout-ms", str(timeout_ms)]
+        if control_type:
+            args.extend(["--control-type", control_type])
+        if automation_id:
+            args.extend(["--automation-id", automation_id])
+        if window:
+            args.extend(["--window", window])
+
+        data = self._run(args)
+        if not data or data.get("status") != "ok":
+            return None
+
+        elem_data = data.get("element")
+        if not elem_data:
+            return None
+        return UiaElement.from_dict(elem_data)
+
+    def capture_focused(self, max_depth: int = 3) -> Optional[UiaElement]:
+        """Capturer l'élément ayant le focus + son contexte."""
+        data = self._run(["capture", "--max-depth", str(max_depth)])
+        if not data or data.get("status") != "ok":
+            return None
+
+        elem_data = data.get("element")
+        if not elem_data:
+            return None
+        return UiaElement.from_dict(elem_data)
+
+
+# Instance globale partagée (singleton léger)
+_SHARED_HELPER: Optional[UIAHelper] = None
+
+
+def get_shared_helper() -> UIAHelper:
+    """Retourner une instance partagée de UIAHelper."""
+    global _SHARED_HELPER
+    if _SHARED_HELPER is None:
+        _SHARED_HELPER = UIAHelper()
+    return _SHARED_HELPER