diff --git a/copienator_gui/__init__.py b/copienator_gui/__init__.py
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+++ b/copienator_gui/__init__.py
@@ -0,0 +1,5 @@
+"""Interface graphique pour piloter le workflow Copienator."""
+
+__all__ = ["__version__"]
+
+__version__ = "0.1.0"
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diff --git a/copienator_gui/__pycache__/workflow.cpython-314.pyc b/copienator_gui/__pycache__/workflow.cpython-314.pyc
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diff --git a/copienator_gui/app.py b/copienator_gui/app.py
new file mode 100644
index 0000000..f7c7a07
--- /dev/null
+++ b/copienator_gui/app.py
@@ -0,0 +1,660 @@
+from __future__ import annotations
+
+import os
+import queue
+import re
+import tkinter as tk
+from datetime import datetime
+from pathlib import Path
+from tkinter import filedialog, messagebox, ttk
+from typing import Any
+
+from .runner import ProcessRunner
+from .state import StateStore
+from .workflow import (
+    CommandVariant,
+    StepDefinition,
+    build_command,
+    build_workflow,
+    command_display,
+    evaluation_argument,
+    value_for_default,
+)
+
+STATUS_LABELS = {
+    "ready": "Prête",
+    "running": "En cours",
+    "success": "Réussie",
+    "failed": "Échouée",
+    "interrupted": "Interrompue",
+    "skipped": "Ignorée",
+    "stale": "À revalider",
+    "detected": "Détectée",
+}
+
+
+class CopienatorApp(tk.Tk):
+    def __init__(
+        self,
+        repository: Path,
+        show_personal_steps: bool,
+        initial_evaluation: Path | None = None,
+    ) -> None:
+        super().__init__()
+        self.repository = repository.resolve()
+        self.steps = build_workflow(show_personal_steps)
+        self.step_by_id = {step.id: step for step in self.steps}
+        self.state_store = StateStore()
+        self.runner = ProcessRunner()
+        self.active_step_id: str | None = None
+        self.current_step: StepDefinition | None = None
+        self.arg_vars: dict[str, tk.Variable] = {}
+        self._rendering = False
+
+        self.title("Copienator — assistant de correction")
+        self.geometry("1180x820")
+        self.minsize(900, 640)
+        self.protocol("WM_DELETE_WINDOW", self._on_close)
+
+        self.evaluation_var = tk.StringVar()
+        self.api_key_var = tk.StringVar(value=os.environ.get("GEMINI_API_KEY", ""))
+        self.proxy_var = tk.StringVar(value=os.environ.get("HTTPS_PROXY", ""))
+        self.variant_var = tk.StringVar()
+        self.extra_var = tk.StringVar()
+        self.command_var = tk.StringVar(value="Sélectionnez une étape.")
+        self.info_var = tk.StringVar(value="Choisissez un dossier d’évaluation.")
+
+        self._build_ui(show_personal_steps)
+        self.extra_var.trace_add("write", lambda *_args: self._update_command_preview())
+        self.after(60, self._poll_runner)
+
+        if initial_evaluation and initial_evaluation.is_dir():
+            self.evaluation_var.set(str(initial_evaluation.resolve()))
+            self._load_evaluation()
+        else:
+            self._populate_tree()
+
+    @property
+    def evaluation(self) -> Path | None:
+        value = self.evaluation_var.get().strip()
+        return Path(value).expanduser().resolve() if value else None
+
+    def _build_ui(self, show_personal_steps: bool) -> None:
+        self.columnconfigure(0, weight=1)
+        self.rowconfigure(1, weight=3)
+        self.rowconfigure(2, weight=2)
+
+        top = ttk.Frame(self, padding=(10, 8))
+        top.grid(row=0, column=0, sticky="ew")
+        top.columnconfigure(1, weight=1)
+        ttk.Label(top, text="Évaluation").grid(row=0, column=0, sticky="w", padx=(0, 8))
+        path_entry = ttk.Entry(top, textvariable=self.evaluation_var)
+        path_entry.grid(row=0, column=1, sticky="ew")
+        path_entry.bind("<Return>", lambda _event: self._load_evaluation())
+        ttk.Button(top, text="Parcourir…", command=self._browse_evaluation).grid(row=0, column=2, padx=6)
+        ttk.Button(top, text="Charger", command=self._load_evaluation).grid(row=0, column=3)
+
+        ttk.Label(top, text="Clé Gemini").grid(row=1, column=0, sticky="w", padx=(0, 8), pady=(7, 0))
+        ttk.Entry(top, textvariable=self.api_key_var, show="•", width=32).grid(
+            row=1, column=1, sticky="w", pady=(7, 0)
+        )
+        environment = ttk.Frame(top)
+        environment.grid(row=1, column=2, columnspan=2, sticky="e", pady=(7, 0))
+        ttk.Label(environment, text="HTTPS_PROXY").pack(side="left", padx=(0, 6))
+        ttk.Entry(environment, textvariable=self.proxy_var, width=28).pack(side="left")
+        profile = "standard + personnel" if show_personal_steps else "standard"
+        ttk.Label(environment, text=f"Profil : {profile}").pack(side="left", padx=(12, 0))
+
+        main_pane = ttk.Panedwindow(self, orient="horizontal")
+        main_pane.grid(row=1, column=0, sticky="nsew", padx=10)
+
+        navigation = ttk.Frame(main_pane, padding=(0, 5, 6, 5))
+        self.tree = ttk.Treeview(navigation, columns=("status",), show="tree headings", selectmode="browse")
+        self.tree.heading("#0", text="Étape")
+        self.tree.heading("status", text="État")
+        self.tree.column("#0", minwidth=230, width=280)
+        self.tree.column("status", minwidth=90, width=105, anchor="center")
+        tree_scroll = ttk.Scrollbar(navigation, orient="vertical", command=self.tree.yview)
+        self.tree.configure(yscrollcommand=tree_scroll.set)
+        self.tree.pack(side="left", fill="both", expand=True)
+        tree_scroll.pack(side="right", fill="y")
+        self.tree.bind("<<TreeviewSelect>>", self._on_tree_select)
+        main_pane.add(navigation, weight=1)
+
+        self.detail = ttk.Frame(main_pane, padding=(12, 6, 4, 4))
+        self.detail.columnconfigure(0, weight=1)
+        self.detail.rowconfigure(2, weight=1)
+        self.title_label = ttk.Label(self.detail, text="Sélectionnez une étape", font=("TkDefaultFont", 15, "bold"))
+        self.title_label.grid(row=0, column=0, sticky="w")
+        self.description_label = ttk.Label(self.detail, text="", wraplength=680, justify="left")
+        self.description_label.grid(row=1, column=0, sticky="ew", pady=(5, 8))
+        self.form = ttk.Frame(self.detail)
+        self.form.grid(row=2, column=0, sticky="nsew")
+        self.form.columnconfigure(1, weight=1)
+
+        command_box = ttk.LabelFrame(self.detail, text="Commande", padding=6)
+        command_box.grid(row=3, column=0, sticky="ew", pady=(8, 5))
+        command_box.columnconfigure(0, weight=1)
+        ttk.Label(command_box, textvariable=self.command_var, wraplength=690, justify="left").grid(
+            row=0, column=0, sticky="ew"
+        )
+
+        buttons = ttk.Frame(self.detail)
+        buttons.grid(row=4, column=0, sticky="ew", pady=(5, 0))
+        self.previous_button = ttk.Button(buttons, text="← Précédente", command=lambda: self._move_selection(-1))
+        self.previous_button.pack(side="left")
+        self.next_button = ttk.Button(buttons, text="Suivante →", command=lambda: self._move_selection(1))
+        self.next_button.pack(side="left", padx=6)
+        self.skip_button = ttk.Button(buttons, text="Marquer ignorée", command=self._skip_step)
+        self.skip_button.pack(side="right")
+        self.run_button = ttk.Button(buttons, text="Exécuter", command=self._run_current_step)
+        self.run_button.pack(side="right", padx=6)
+        main_pane.add(self.detail, weight=3)
+
+        console_frame = ttk.LabelFrame(self, text="Sortie en temps réel", padding=(7, 5))
+        console_frame.grid(row=2, column=0, sticky="nsew", padx=10, pady=(6, 8))
+        console_frame.columnconfigure(0, weight=1)
+        console_frame.rowconfigure(0, weight=1)
+        self.console = tk.Text(
+            console_frame,
+            height=14,
+            wrap="word",
+            background="#171717",
+            foreground="#efefef",
+            insertbackground="white",
+            state="disabled",
+        )
+        console_scroll = ttk.Scrollbar(console_frame, orient="vertical", command=self.console.yview)
+        self.console.configure(yscrollcommand=console_scroll.set)
+        self.console.grid(row=0, column=0, sticky="nsew")
+        console_scroll.grid(row=0, column=1, sticky="ns")
+
+        console_actions = ttk.Frame(console_frame)
+        console_actions.grid(row=1, column=0, columnspan=2, sticky="ew", pady=(5, 0))
+        console_actions.columnconfigure(1, weight=1)
+        ttk.Label(console_actions, text="Réponse au script").grid(row=0, column=0, padx=(0, 6))
+        self.stdin_var = tk.StringVar()
+        self.stdin_entry = ttk.Entry(console_actions, textvariable=self.stdin_var)
+        self.stdin_entry.grid(row=0, column=1, sticky="ew")
+        self.stdin_entry.bind("<Return>", lambda _event: self._send_input())
+        self.send_button = ttk.Button(console_actions, text="Envoyer", command=self._send_input, state="disabled")
+        self.send_button.grid(row=0, column=2, padx=5)
+        self.interrupt_button = ttk.Button(
+            console_actions, text="Interrompre", command=self._interrupt, state="disabled"
+        )
+        self.interrupt_button.grid(row=0, column=3, padx=5)
+        self.force_button = ttk.Button(
+            console_actions, text="Forcer l’arrêt", command=self._force_stop, state="disabled"
+        )
+        self.force_button.grid(row=0, column=4)
+        ttk.Button(console_actions, text="Effacer la console", command=self._clear_console).grid(
+            row=0, column=5, padx=(8, 0)
+        )
+
+        status = ttk.Label(self, textvariable=self.info_var, anchor="w", relief="sunken", padding=(6, 3))
+        status.grid(row=3, column=0, sticky="ew")
+
+    def _browse_evaluation(self) -> None:
+        selected = filedialog.askdirectory(initialdir=self.evaluation_var.get() or self.repository)
+        if selected:
+            self.evaluation_var.set(selected)
+            self._load_evaluation()
+
+    def _load_evaluation(self) -> None:
+        evaluation = self.evaluation
+        if not evaluation or not evaluation.is_dir():
+            messagebox.showerror("Dossier invalide", "Choisissez un dossier d’évaluation existant.")
+            return
+        self._save_current_form()
+        self.state_store.load(evaluation)
+        for step in self.steps:
+            if self.state_store.step(step.id).get("status") == "running":
+                self.state_store.update_step(step.id, status="interrupted")
+        self._populate_tree()
+        missing = [name for name in ("enonce.pdf", "enonce.tex", "correction.tex") if not (evaluation / name).exists()]
+        names_found = (evaluation / "names").exists() or (self.repository / "names").exists()
+        details = []
+        if missing:
+            details.append("manquants : " + ", ".join(missing))
+        if not names_found:
+            details.append("fichier names introuvable")
+        if not self.api_key_var.get():
+            details.append("clé Gemini non renseignée")
+        self.info_var.set(
+            f"Évaluation chargée : {evaluation}"
+            + (" — " + " ; ".join(details) if details else " — prérequis principaux détectés")
+        )
+        first = self.steps[0].id if self.steps else None
+        if first:
+            self.tree.selection_set(first)
+            self.tree.see(first)
+
+    def _populate_tree(self) -> None:
+        selected = self.current_step.id if self.current_step else None
+        self.tree.delete(*self.tree.get_children())
+        section_items: dict[str, str] = {}
+        for step in self.steps:
+            if step.section not in section_items:
+                section_id = f"section:{len(section_items)}"
+                section_items[step.section] = section_id
+                self.tree.insert("", "end", iid=section_id, text=step.section, values=("",), open=True)
+            status = self._step_status(step)
+            suffix = " (facultative)" if step.optional else ""
+            self.tree.insert(
+                section_items[step.section],
+                "end",
+                iid=step.id,
+                text=step.title + suffix,
+                values=(STATUS_LABELS.get(status, status),),
+            )
+        if selected and self.tree.exists(selected):
+            self.tree.selection_set(selected)
+
+    def _step_status(self, step: StepDefinition) -> str:
+        if self.state_store.evaluation:
+            saved = self.state_store.step(step.id).get("status")
+            if saved:
+                return str(saved)
+            if self._artifacts_exist(step):
+                return "detected"
+            if step.id == "inputs" and not self._missing_requirements(step):
+                return "detected"
+        return "ready"
+
+    def _artifacts_exist(self, step: StepDefinition) -> bool:
+        evaluation = self.evaluation
+        if not evaluation or not step.artifacts:
+            return False
+        for pattern in step.artifacts:
+            if any(char in pattern for char in "*?["):
+                if next(evaluation.glob(pattern), None) is not None:
+                    return True
+            elif (evaluation / pattern).exists():
+                return True
+        return False
+
+    def _missing_requirements(self, step: StepDefinition) -> list[str]:
+        evaluation = self.evaluation
+        if not evaluation:
+            return list(step.requires)
+        missing = []
+        for pattern in step.requires:
+            if any(char in pattern for char in "*?["):
+                exists = next(evaluation.glob(pattern), None) is not None
+            else:
+                exists = (evaluation / pattern).exists()
+            if not exists:
+                missing.append(pattern)
+        return missing
+
+    def _on_tree_select(self, _event: tk.Event[Any] | None = None) -> None:
+        selection = self.tree.selection()
+        if not selection or selection[0].startswith("section:"):
+            return
+        step = self.step_by_id.get(selection[0])
+        if not step:
+            return
+        if self.current_step and self.current_step.id != step.id:
+            self._save_current_form()
+        self.current_step = step
+        self._render_step()
+
+    def _render_step(self) -> None:
+        step = self.current_step
+        if not step:
+            return
+        self._rendering = True
+        for child in self.form.winfo_children():
+            child.destroy()
+        self.arg_vars.clear()
+        entry = self.state_store.step(step.id) if self.state_store.evaluation else {}
+        saved_variant = entry.get("variant", step.variants[0].id)
+        if saved_variant not in {variant.id for variant in step.variants}:
+            saved_variant = step.variants[0].id
+        self.variant_var.set(saved_variant)
+        self.extra_var.set(str(entry.get("extra", "")))
+        self.title_label.configure(text=step.title)
+        missing = self._missing_requirements(step)
+        description = step.description
+        if missing:
+            description += "\nPrérequis non détectés : " + ", ".join(missing)
+        self.description_label.configure(text=description)
+
+        row = 0
+        if len(step.variants) > 1:
+            ttk.Label(self.form, text="Mode").grid(row=row, column=0, sticky="w", pady=4, padx=(0, 8))
+            labels = [variant.label for variant in step.variants]
+            combo = ttk.Combobox(self.form, values=labels, state="readonly")
+            variant_index = [variant.id for variant in step.variants].index(saved_variant)
+            combo.current(variant_index)
+            combo.grid(row=row, column=1, sticky="ew", pady=4)
+            combo.bind("<<ComboboxSelected>>", lambda _event: self._select_variant(combo.current()))
+            row += 1
+
+        values = entry.get("values", {}) if isinstance(entry.get("values", {}), dict) else {}
+        variant = self._current_variant()
+        evaluation_arg = self._evaluation_arg()
+        for spec in step.arguments:
+            if spec.variants and variant.id not in spec.variants:
+                continue
+            value = values.get(spec.name, value_for_default(spec.default, evaluation_arg))
+            ttk.Label(self.form, text=spec.label).grid(row=row, column=0, sticky="nw", pady=4, padx=(0, 8))
+            if spec.kind == "bool":
+                variable: tk.Variable = tk.BooleanVar(value=bool(value))
+                widget = ttk.Checkbutton(self.form, variable=variable)
+                widget.grid(row=row, column=1, sticky="w", pady=4)
+            elif spec.kind == "choice":
+                variable = tk.StringVar(value=str(value))
+                widget = ttk.Combobox(self.form, textvariable=variable, values=spec.choices, state="readonly")
+                widget.grid(row=row, column=1, sticky="ew", pady=4)
+            else:
+                variable = tk.StringVar(value=str(value))
+                field = ttk.Frame(self.form)
+                field.grid(row=row, column=1, sticky="ew", pady=4)
+                field.columnconfigure(0, weight=1)
+                widget = ttk.Entry(field, textvariable=variable)
+                widget.grid(row=0, column=0, sticky="ew")
+                if spec.kind == "path":
+                    ttk.Button(field, text="Fichier…", command=lambda var=variable: self._browse_target_file(var)).grid(
+                        row=0, column=1, padx=(5, 0)
+                    )
+                    ttk.Button(field, text="Dossier…", command=lambda var=variable: self._browse_target_dir(var)).grid(
+                        row=0, column=2, padx=(5, 0)
+                    )
+            self.arg_vars[spec.name] = variable
+            variable.trace_add("write", lambda *_args: self._update_command_preview())
+            if spec.help:
+                ttk.Label(self.form, text=spec.help, foreground="#666666", wraplength=540).grid(
+                    row=row + 1, column=1, sticky="w"
+                )
+                row += 1
+            row += 1
+
+        if not step.is_manual:
+            ttk.Label(self.form, text="Arguments supplémentaires").grid(
+                row=row, column=0, sticky="w", pady=(10, 4), padx=(0, 8)
+            )
+            ttk.Entry(self.form, textvariable=self.extra_var).grid(row=row, column=1, sticky="ew", pady=(10, 4))
+
+        self.run_button.configure(text="Marquer terminée" if step.is_manual else "Exécuter")
+        self.skip_button.configure(state="normal" if step.optional else "disabled")
+        self._rendering = False
+        self._update_command_preview()
+        self._update_controls()
+
+    def _select_variant(self, index: int) -> None:
+        if not self.current_step or index < 0:
+            return
+        self._save_current_form()
+        self.variant_var.set(self.current_step.variants[index].id)
+        if self.state_store.evaluation:
+            self.state_store.update_step(self.current_step.id, variant=self.variant_var.get())
+        self._render_step()
+
+    def _current_variant(self) -> CommandVariant:
+        assert self.current_step is not None
+        selected = self.variant_var.get()
+        return next((variant for variant in self.current_step.variants if variant.id == selected), self.current_step.variants[0])
+
+    def _values(self) -> dict[str, object]:
+        return {name: variable.get() for name, variable in self.arg_vars.items()}
+
+    def _save_current_form(self) -> None:
+        if self._rendering or not self.current_step or not self.state_store.evaluation:
+            return
+        saved_values = self.state_store.step(self.current_step.id).get("values", {})
+        merged_values = dict(saved_values) if isinstance(saved_values, dict) else {}
+        merged_values.update(self._values())
+        self.state_store.update_step(
+            self.current_step.id,
+            variant=self.variant_var.get() or self.current_step.variants[0].id,
+            values=merged_values,
+            extra=self.extra_var.get(),
+        )
+
+    def _evaluation_arg(self) -> str:
+        evaluation = self.evaluation
+        return evaluation_argument(self.repository, evaluation) if evaluation else "<évaluation>"
+
+    def _make_command(self) -> list[str]:
+        if not self.current_step:
+            return []
+        return build_command(
+            self.repository,
+            self.current_step,
+            self._current_variant(),
+            self._values(),
+            self._evaluation_arg(),
+            self.extra_var.get(),
+        )
+
+    def _update_command_preview(self) -> None:
+        if self._rendering or not self.current_step:
+            return
+        if self.current_step.is_manual:
+            self.command_var.set("Étape manuelle — aucune commande ne sera exécutée.")
+            return
+        try:
+            self.command_var.set(command_display(self._make_command()))
+        except ValueError as exc:
+            self.command_var.set(f"Arguments invalides : {exc}")
+
+    def _browse_target_file(self, variable: tk.Variable) -> None:
+        selected = filedialog.askopenfilename(initialdir=self.evaluation or self.repository)
+        if selected:
+            variable.set(selected)
+
+    def _browse_target_dir(self, variable: tk.Variable) -> None:
+        selected = filedialog.askdirectory(initialdir=self.evaluation or self.repository)
+        if selected:
+            variable.set(selected)
+
+    def _validate_arguments(self) -> bool:
+        if not self.current_step:
+            return False
+        variant = self._current_variant()
+        for spec in self.current_step.arguments:
+            if spec.variants and variant.id not in spec.variants:
+                continue
+            value = self.arg_vars.get(spec.name)
+            if spec.kind == "int" and value and str(value.get()).strip():
+                try:
+                    int(str(value.get()))
+                except ValueError:
+                    messagebox.showerror("Argument invalide", f"« {spec.label} » doit être un entier.")
+                    return False
+        try:
+            self._make_command()
+        except ValueError as exc:
+            messagebox.showerror("Arguments invalides", str(exc))
+            return False
+        return True
+
+    def _run_current_step(self) -> None:
+        step = self.current_step
+        evaluation = self.evaluation
+        if not step or not evaluation or not self.state_store.evaluation:
+            messagebox.showerror("Évaluation absente", "Chargez d’abord un dossier d’évaluation.")
+            return
+        if self.runner.running:
+            messagebox.showwarning("Traitement en cours", "Interrompez le traitement actuel avant d’en lancer un autre.")
+            return
+        if step.is_manual:
+            self._mark_step("success")
+            return
+        if not self._validate_arguments():
+            return
+        missing = self._missing_requirements(step)
+        if missing and not messagebox.askyesno(
+            "Prérequis non détectés",
+            "Les éléments suivants n’ont pas été trouvés :\n\n"
+            + "\n".join(missing)
+            + "\n\nLancer tout de même la commande ?",
+        ):
+            return
+        variant = self._current_variant()
+        command = self._make_command()
+        if variant.dangerous and not messagebox.askyesno(
+            "Confirmation requise",
+            "Cette commande réinitialise ou supprime des résultats de correction. Continuer ?",
+            icon="warning",
+        ):
+            return
+
+        self._save_current_form()
+        ordered_ids = [item.id for item in self.steps]
+        self.state_store.invalidate_after(ordered_ids, step.id)
+        self.state_store.update_step(step.id, status="running", command=command_display(command))
+        self.active_step_id = step.id
+        timestamp = datetime.now().astimezone().strftime("%Y%m%d-%H%M%S")
+        safe_step = re.sub(r"[^A-Za-z0-9_.-]+", "_", step.id)
+        log_path = evaluation / ".copienator" / "logs" / f"{timestamp}-{safe_step}.log"
+
+        environment = os.environ.copy()
+        environment["PYTHONUNBUFFERED"] = "1"
+        environment["PYTHONIOENCODING"] = "utf-8"
+        if self.api_key_var.get().strip():
+            environment["GEMINI_API_KEY"] = self.api_key_var.get().strip()
+        if self.proxy_var.get().strip():
+            environment["HTTPS_PROXY"] = self.proxy_var.get().strip()
+
+        self._append_console(f"\n$ {command_display(command)}\n")
+        try:
+            self.runner.start(command, self.repository, environment, log_path)
+        except (OSError, RuntimeError) as exc:
+            self.state_store.update_step(step.id, status="failed")
+            self.state_store.add_history(
+                {"step": step.id, "command": command_display(command), "status": "failed", "error": str(exc)}
+            )
+            self.active_step_id = None
+            self._append_console(f"Impossible de lancer la commande : {exc}\n")
+            messagebox.showerror("Échec du lancement", str(exc))
+        self._populate_tree()
+        self._update_controls()
+
+    def _mark_step(self, status: str) -> None:
+        if not self.current_step or not self.state_store.evaluation:
+            return
+        self._save_current_form()
+        self.state_store.invalidate_after([item.id for item in self.steps], self.current_step.id)
+        self.state_store.update_step(self.current_step.id, status=status)
+        self.state_store.add_history({"step": self.current_step.id, "status": status, "manual": True})
+        self._populate_tree()
+        self.info_var.set(f"{self.current_step.title} : {STATUS_LABELS.get(status, status).lower()}.")
+
+    def _skip_step(self) -> None:
+        if self.current_step and self.current_step.optional:
+            self._mark_step("skipped")
+
+    def _poll_runner(self) -> None:
+        while True:
+            try:
+                event, payload = self.runner.events.get_nowait()
+            except queue.Empty:
+                break
+            if event == "output":
+                self._append_console(str(payload))
+            elif event == "input_echo":
+                self._append_console(f"> {payload}")
+            elif event == "runner_error":
+                self._append_console(f"\nErreur du lanceur : {payload}\n")
+            elif event == "finished":
+                return_code, interrupted = payload
+                self._finish_process(int(return_code), bool(interrupted))
+        self.after(60, self._poll_runner)
+
+    def _finish_process(self, return_code: int, interrupted: bool) -> None:
+        step_id = self.active_step_id
+        if not step_id:
+            return
+        if interrupted:
+            status = "interrupted"
+        else:
+            status = "success" if return_code == 0 else "failed"
+        self.state_store.update_step(step_id, status=status, return_code=return_code)
+        self.state_store.add_history(
+            {
+                "step": step_id,
+                "command": self.state_store.step(step_id).get("command", ""),
+                "status": status,
+                "return_code": return_code,
+            }
+        )
+        title = self.step_by_id[step_id].title
+        self._append_console(f"\n[Terminé — code {return_code} — {STATUS_LABELS[status]}]\n")
+        self.info_var.set(f"{title} : {STATUS_LABELS[status].lower()} (code {return_code}).")
+        self.active_step_id = None
+        self._populate_tree()
+        self._update_controls()
+
+    def _send_input(self) -> None:
+        text = self.stdin_var.get()
+        try:
+            self.runner.send_input(text)
+        except RuntimeError as exc:
+            messagebox.showinfo("Aucune saisie attendue", str(exc))
+            return
+        self.stdin_var.set("")
+
+    def _interrupt(self) -> None:
+        if self.runner.running and messagebox.askyesno(
+            "Interrompre", "Envoyer une interruption au script en cours ?"
+        ):
+            try:
+                self.runner.interrupt()
+                self.info_var.set("Interruption demandée. Utilisez « Forcer l’arrêt » si le script ne répond pas.")
+            except OSError as exc:
+                messagebox.showerror("Interruption impossible", str(exc))
+
+    def _force_stop(self) -> None:
+        if self.runner.running and messagebox.askyesno(
+            "Forcer l’arrêt", "Forcer l’arrêt du script et de ses processus enfants ?", icon="warning"
+        ):
+            try:
+                self.runner.force_stop()
+            except OSError as exc:
+                messagebox.showerror("Arrêt impossible", str(exc))
+
+    def _append_console(self, text: str) -> None:
+        self.console.configure(state="normal")
+        self.console.insert("end", text)
+        self.console.see("end")
+        self.console.configure(state="disabled")
+
+    def _clear_console(self) -> None:
+        self.console.configure(state="normal")
+        self.console.delete("1.0", "end")
+        self.console.configure(state="disabled")
+
+    def _update_controls(self) -> None:
+        running = self.runner.running
+        self.run_button.configure(state="disabled" if running or not self.current_step else "normal")
+        self.interrupt_button.configure(state="normal" if running else "disabled")
+        self.force_button.configure(state="normal" if running else "disabled")
+        self.send_button.configure(state="normal" if running else "disabled")
+        self.stdin_entry.configure(state="normal" if running else "disabled")
+
+    def _move_selection(self, delta: int) -> None:
+        if not self.current_step:
+            return
+        ids = [step.id for step in self.steps]
+        try:
+            index = ids.index(self.current_step.id)
+        except ValueError:
+            return
+        target = max(0, min(len(ids) - 1, index + delta))
+        self.tree.selection_set(ids[target])
+        self.tree.see(ids[target])
+
+    def _on_close(self) -> None:
+        if self.runner.running:
+            if not messagebox.askyesno(
+                "Traitement en cours", "Un script est encore actif. Le forcer à s’arrêter et fermer l’application ?"
+            ):
+                return
+            try:
+                self.runner.force_stop()
+            except OSError:
+                pass
+        self._save_current_form()
+        self.destroy()
diff --git a/copienator_gui/runner.py b/copienator_gui/runner.py
new file mode 100644
index 0000000..0b19e90
--- /dev/null
+++ b/copienator_gui/runner.py
@@ -0,0 +1,113 @@
+from __future__ import annotations
+
+import os
+import queue
+import signal
+import subprocess
+import threading
+from pathlib import Path
+from typing import Any
+
+
+class ProcessRunner:
+    """Run one subprocess and expose thread-safe events for the Tk loop."""
+
+    def __init__(self) -> None:
+        self.events: queue.Queue[tuple[str, Any]] = queue.Queue()
+        self.process: subprocess.Popen[bytes] | None = None
+        self._interrupted = False
+        self._log_file = None
+
+    @property
+    def running(self) -> bool:
+        return self.process is not None and self.process.poll() is None
+
+    def start(
+        self,
+        command: list[str],
+        cwd: Path,
+        environment: dict[str, str],
+        log_path: Path,
+    ) -> None:
+        if self.running:
+            raise RuntimeError("Un processus est déjà en cours")
+        log_path.parent.mkdir(parents=True, exist_ok=True)
+        self._log_file = log_path.open("wb")
+        self._interrupted = False
+
+        kwargs: dict[str, Any] = {}
+        if os.name == "nt":
+            kwargs["creationflags"] = subprocess.CREATE_NEW_PROCESS_GROUP
+        else:
+            kwargs["start_new_session"] = True
+
+        self.process = subprocess.Popen(
+            command,
+            cwd=cwd,
+            env=environment,
+            stdin=subprocess.PIPE,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            bufsize=0,
+            **kwargs,
+        )
+        thread = threading.Thread(target=self._read_process, daemon=True)
+        thread.start()
+
+    def _read_process(self) -> None:
+        process = self.process
+        if process is None or process.stdout is None:
+            return
+        return_code = -1
+        try:
+            while True:
+                chunk = process.stdout.read(4096)
+                if not chunk:
+                    break
+                if self._log_file:
+                    self._log_file.write(chunk)
+                    self._log_file.flush()
+                self.events.put(("output", chunk.decode("utf-8", errors="replace")))
+            return_code = process.wait()
+        except (OSError, ValueError) as exc:  # pragma: no cover - defensive reporting
+            self.events.put(("runner_error", str(exc)))
+            return_code = process.wait()
+        finally:
+            if self._log_file:
+                self._log_file.close()
+                self._log_file = None
+            process.stdout.close()
+            if process.stdin:
+                process.stdin.close()
+        self.events.put(("finished", (return_code, self._interrupted)))
+
+    def send_input(self, text: str) -> None:
+        if not self.running or not self.process or not self.process.stdin:
+            raise RuntimeError("Aucun processus n’attend de saisie")
+        data = (text + "\n").encode("utf-8")
+        self.process.stdin.write(data)
+        self.process.stdin.flush()
+        self.events.put(("input_echo", text + "\n"))
+
+    def interrupt(self) -> None:
+        if not self.running or not self.process:
+            return
+        self._interrupted = True
+        if os.name == "nt":
+            self.process.send_signal(signal.CTRL_BREAK_EVENT)
+        else:
+            os.killpg(self.process.pid, signal.SIGINT)
+
+    def force_stop(self) -> None:
+        if not self.running or not self.process:
+            return
+        self._interrupted = True
+        if os.name == "nt":
+            subprocess.run(
+                ["taskkill", "/PID", str(self.process.pid), "/T", "/F"],
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+                check=False,
+            )
+        else:
+            os.killpg(self.process.pid, signal.SIGKILL)
diff --git a/copienator_gui/state.py b/copienator_gui/state.py
new file mode 100644
index 0000000..b2f1b04
--- /dev/null
+++ b/copienator_gui/state.py
@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+import json
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+
+STATE_FILENAME = ".copienator-gui.json"
+
+
+class StateStore:
+    def __init__(self) -> None:
+        self.evaluation: Path | None = None
+        self.data: dict[str, Any] = self._empty_data()
+
+    @staticmethod
+    def _empty_data() -> dict[str, Any]:
+        return {"version": 1, "steps": {}, "history": []}
+
+    def load(self, evaluation: Path) -> None:
+        self.evaluation = evaluation
+        path = evaluation / STATE_FILENAME
+        try:
+            loaded = json.loads(path.read_text(encoding="utf-8"))
+            self.data = loaded if isinstance(loaded, dict) else self._empty_data()
+        except (OSError, json.JSONDecodeError):
+            self.data = self._empty_data()
+        self.data.setdefault("version", 1)
+        self.data.setdefault("steps", {})
+        self.data.setdefault("history", [])
+
+    def save(self) -> None:
+        if not self.evaluation:
+            return
+        path = self.evaluation / STATE_FILENAME
+        temporary = path.with_suffix(path.suffix + ".tmp")
+        temporary.write_text(
+            json.dumps(self.data, indent=2, ensure_ascii=False), encoding="utf-8"
+        )
+        temporary.replace(path)
+
+    def step(self, step_id: str) -> dict[str, Any]:
+        return self.data["steps"].setdefault(step_id, {})
+
+    def update_step(self, step_id: str, **changes: Any) -> None:
+        entry = self.step(step_id)
+        entry.update(changes)
+        entry["updated_at"] = datetime.now(timezone.utc).isoformat()
+        self.save()
+
+    def add_history(self, entry: dict[str, Any]) -> None:
+        entry = dict(entry)
+        entry["timestamp"] = datetime.now(timezone.utc).isoformat()
+        self.data["history"].append(entry)
+        self.data["history"] = self.data["history"][-200:]
+        self.save()
+
+    def invalidate_after(self, ordered_ids: list[str], current_id: str) -> None:
+        try:
+            index = ordered_ids.index(current_id)
+        except ValueError:
+            return
+        for step_id in ordered_ids[index + 1 :]:
+            entry = self.step(step_id)
+            if entry.get("status") in {"success", "detected", "skipped"}:
+                entry["status"] = "stale"
+        self.save()
diff --git a/copienator_gui/workflow.py b/copienator_gui/workflow.py
new file mode 100644
index 0000000..50d7e6e
--- /dev/null
+++ b/copienator_gui/workflow.py
@@ -0,0 +1,485 @@
+from __future__ import annotations
+
+import os
+import shlex
+import sys
+from collections.abc import Iterable
+from dataclasses import dataclass
+from pathlib import Path
+
+EVALUATION = "${evaluation}"
+
+
+@dataclass(frozen=True)
+class ArgumentSpec:
+    name: str
+    label: str
+    kind: str = "text"  # text, int, bool, choice, path
+    flag: str | None = None
+    default: object = ""
+    choices: tuple[str, ...] = ()
+    help: str = ""
+    positional: bool = False
+    variants: tuple[str, ...] = ()
+
+
+@dataclass(frozen=True)
+class CommandVariant:
+    id: str
+    label: str
+    program: str | None
+    kind: str = "python"  # python, shell, external, manual
+    fixed_args: tuple[str, ...] = ()
+    dangerous: bool = False
+
+
+@dataclass(frozen=True)
+class StepDefinition:
+    id: str
+    section: str
+    title: str
+    description: str
+    variants: tuple[CommandVariant, ...]
+    arguments: tuple[ArgumentSpec, ...] = ()
+    optional: bool = False
+    personal: bool = False
+    requires: tuple[str, ...] = ()
+    artifacts: tuple[str, ...] = ()
+
+    @property
+    def is_manual(self) -> bool:
+        return all(variant.kind == "manual" for variant in self.variants)
+
+
+def arg_target(help_text: str = "Dossier d’évaluation ou fichier à traiter") -> ArgumentSpec:
+    return ArgumentSpec(
+        "target",
+        "Cible",
+        kind="path",
+        default=EVALUATION,
+        positional=True,
+        help=help_text,
+    )
+
+
+def build_workflow(show_personal_steps: bool) -> list[StepDefinition]:
+    python = lambda ident, label, script, **kwargs: CommandVariant(
+        ident, label, script, "python", **kwargs
+    )
+    manual = lambda ident, label="Étape manuelle": CommandVariant(
+        ident, label, None, "manual"
+    )
+
+    steps = [
+        StepDefinition(
+            "inputs",
+            "Préparation",
+            "Vérifier les fichiers d’entrée",
+            "Le dossier doit contenir enonce.pdf, enonce.tex et correction.tex. "
+            "Le fichier names doit être présent dans l’évaluation ou à la racine du projet.",
+            (manual("check"),),
+            requires=("enonce.pdf", "enonce.tex", "correction.tex"),
+        ),
+        StepDefinition(
+            "statement",
+            "Prétraitement de l’énoncé",
+            "Analyser l’énoncé",
+            "Détecte les questions, leurs groupes, le corrigé et les indications de barème.",
+            (
+                python("gemini", "Analyse avec Gemini", "gemini_for_enonce.py"),
+                python("personal", "Alternative enonce_info.py", "enonce_info.py"),
+            ),
+            arguments=(
+                arg_target("Dossier de l’évaluation"),
+                ArgumentSpec(
+                    "restart",
+                    "Ignorer le cache (--restart)",
+                    kind="bool",
+                    flag="--restart",
+                    variants=("gemini",),
+                ),
+            ),
+            requires=("enonce.pdf", "enonce.tex", "correction.tex"),
+            artifacts=("labels", "Text", "Sol", "Persp"),
+        ),
+        StepDefinition(
+            "review_persp",
+            "Prétraitement de l’énoncé",
+            "Relire les barèmes dans Persp",
+            "Étape manuelle facultative : vérifier et modifier les instructions de correction.",
+            (manual("review"),),
+            optional=True,
+            requires=("Persp",),
+        ),
+        StepDefinition(
+            "rotate",
+            "Prétraitement des copies",
+            "Retourner toutes les copies",
+            "Rotation facultative de 180° lorsque les scans sont à l’envers.",
+            (CommandVariant("rotate", "Rotation", "rotate_all.sh", "shell"),),
+            arguments=(arg_target("Dossier de l’évaluation"),),
+            optional=True,
+        ),
+        StepDefinition(
+            "rename",
+            "Prétraitement des copies",
+            "Renommer les PDF en CopieXX.pdf",
+            "Renomme les PDF du dossier d’évaluation dans leur ordre courant.",
+            (CommandVariant("rename", "Renommage", "rename_to_copie.sh", "shell"),),
+            arguments=(arg_target("Dossier de l’évaluation"),),
+        ),
+        StepDefinition(
+            "page_splitter",
+            "Prétraitement des copies",
+            "Séparer et réordonner les pages",
+            "Ouvre l’outil interactif de découpage A3 vers A4. La cible peut être un dossier ou un PDF.",
+            (python("default", "Séparation des pages", "page_splitter.py"),),
+            arguments=(arg_target(),),
+            artifacts=("Copies", "Copies Originales"),
+        ),
+        StepDefinition(
+            "cutleft",
+            "Prétraitement des copies",
+            "Découper la marge des labels",
+            "Produit les images de la partie gauche des copies. Une copie précise peut être ciblée.",
+            (python("default", "Découpe", "cutleft.py"),),
+            arguments=(
+                arg_target(),
+                ArgumentSpec("fullpage", "Toujours utiliser la page entière", "bool", "--fullpage"),
+            ),
+            requires=("Copies",),
+            artifacts=("Cutleft",),
+        ),
+        StepDefinition(
+            "labels",
+            "Labels et regroupement",
+            "Détecter les labels avec Gemini",
+            "Identifie les labels dans les images produites par la découpe gauche.",
+            (python("default", "Détection des labels", "gemini_for_labels.py"),),
+            arguments=(
+                arg_target(),
+                ArgumentSpec("overwrite", "Régénérer les résultats", "bool", "--overwrite"),
+            ),
+            requires=("labels", "Copies", "Cutleft"),
+            artifacts=("Copies/*.json",),
+        ),
+        StepDefinition(
+            "plotting",
+            "Labels et regroupement",
+            "Vérifier visuellement les labels",
+            "Ouvre la fenêtre de vérification. La cible peut être toute l’évaluation ou une copie.",
+            (python("default", "Vérification", "plotting.py"),),
+            arguments=(arg_target(),),
+            requires=("labels", "Cutleft"),
+            artifacts=("Copies/Copie*.json",),
+        ),
+        StepDefinition(
+            "splitting",
+            "Labels et regroupement",
+            "Découper les réponses par question",
+            "Découpe les copies à partir des coordonnées de labels vérifiées.",
+            (python("default", "Découpage", "splitting_int.py"),),
+            arguments=(arg_target(),),
+            requires=("Copies",),
+            artifacts=("Copies/Copie*/*",),
+        ),
+        StepDefinition(
+            "grouping",
+            "Labels et regroupement",
+            "Regrouper les réponses",
+            "Regroupe les réponses portant le même label pour préparer les requêtes.",
+            (python("default", "Regroupement", "grouping.py"),),
+            arguments=(arg_target("Dossier de l’évaluation"),),
+            requires=("Copies",),
+            artifacts=("Par label",),
+        ),
+        StepDefinition(
+            "correction",
+            "Correction",
+            "Lancer ou intégrer la correction",
+            "Choisir une correction immédiate, batch, hybride, une recorrection, ou l’intégration d’un batch.",
+            (
+                python("live", "Correction immédiate", "correction.py"),
+                python("batch", "Préparer toutes les requêtes batch", "correction.py", fixed_args=("--batch",)),
+                python("hybrid", "Batch à partir d’un label", "correction.py"),
+                python("refaire", "Recorrection depuis refaire.json", "correction.py", fixed_args=("--refaire",)),
+                python(
+                    "integrate",
+                    "Intégrer les résultats batch",
+                    "correction.py",
+                    fixed_args=("--deal-with-batched",),
+                ),
+                python("reset", "Réinitialiser les corrections", "correction.py", fixed_args=("--reset",), dangerous=True),
+            ),
+            arguments=(
+                arg_target("Évaluation ou image Group_X.jpg"),
+                ArgumentSpec("overwrite", "Écraser les corrections existantes", "bool", "--overwrite", variants=("live",)),
+                ArgumentSpec("limit", "Limite d’appels Pro", "int", "--limit", variants=("live",)),
+                ArgumentSpec("batch_from", "Premier label envoyé en batch", "text", "--batch-from", variants=("hybrid",)),
+            ),
+            requires=("Par label", "Persp", "labels"),
+            artifacts=("correction.json", "batch_requests_*.jsonl"),
+        ),
+        StepDefinition(
+            "submit_batches",
+            "Correction",
+            "Envoyer les batchs",
+            "Envoie à Gemini les fichiers JSONL produits par le mode batch.",
+            (python("default", "Envoi", "submit_batches.py"),),
+            arguments=(arg_target("Dossier de l’évaluation"),),
+            optional=True,
+            artifacts=("batch_jobs.json",),
+        ),
+        StepDefinition(
+            "batch_status",
+            "Correction",
+            "Consulter l’état des batchs",
+            "Affiche les jobs Gemini en cours. L’identifiant de téléchargement est facultatif.",
+            (python("default", "État des batchs", "batch_status.py"),),
+            arguments=(ArgumentSpec("download", "Télécharger le job", "text", "--download"),),
+            optional=True,
+        ),
+        StepDefinition(
+            "fetch_batches",
+            "Correction",
+            "Récupérer les résultats batch",
+            "Télécharge et rassemble les réponses des jobs terminés.",
+            (python("default", "Récupération", "fetch_batched_results.py"),),
+            arguments=(arg_target("Dossier de l’évaluation"),),
+            optional=True,
+        ),
+        StepDefinition(
+            "post_correction",
+            "Correction",
+            "Nettoyer la correction",
+            "Corrige certains problèmes d’encodage et prépare le texte pour LaTeX.",
+            (python("default", "Post-correction", "post-correction.py"),),
+            arguments=(arg_target("Dossier de l’évaluation"),),
+            requires=("correction.json",),
+        ),
+        StepDefinition(
+            "manual_resolution",
+            "Correction",
+            "Résoudre les conflits manuels",
+            "Étape conditionnelle, uniquement si manual_resolutions.txt contient des conflits à traiter.",
+            (python("default", "Résolution", "resolve_manual.py"),),
+            arguments=(arg_target("Dossier de l’évaluation"),),
+            optional=True,
+            requires=("manual_resolutions.txt", "correction.json"),
+        ),
+        StepDefinition(
+            "annotation",
+            "Génération des annotations",
+            "Générer les copies annotées",
+            "Les trois modes sont exclusifs pour un parcours donné.",
+            (
+                python("simple", "Annotations simples (Anot)", "annotating.py"),
+                python("checks", "Annotations avec cases (Bnot)", "annotating_with_checks.py"),
+                python("grouped", "Annotations groupées (BGnot)", "annotating_by_label.py"),
+            ),
+            arguments=(
+                arg_target("Dossier de l’évaluation"),
+                ArgumentSpec("overwrite", "Écraser les sorties", "bool", "--overwrite"),
+                ArgumentSpec("refaire", "Mode refaire", "bool", "--refaire", variants=("checks",)),
+            ),
+            requires=("correction.json",),
+            artifacts=("Anot", "Bnot", "BGnot"),
+        ),
+        StepDefinition(
+            "export",
+            "Génération des annotations",
+            "Exporter vers la tablette",
+            "Exporte les groupes vers le dossier EXPORT_DIR défini dans config.py.",
+            (python("default", "Export", "export.py"),),
+            arguments=(
+                arg_target("Dossier de l’évaluation"),
+                ArgumentSpec("refaire", "Mode refaire", "bool", "--refaire"),
+            ),
+            optional=True,
+        ),
+        StepDefinition(
+            "tablet",
+            "Correction manuscrite",
+            "Annoter les PDF sur la tablette",
+            "Étape manuelle : enregistrer chaque résultat sous le nom Concat_annotated.pdf.",
+            (manual("tablet"),),
+        ),
+        StepDefinition(
+            "import",
+            "Correction manuscrite",
+            "Importer les annotations manuscrites",
+            "Copie les PDF présents dans IMPORT_DIR vers l’évaluation.",
+            (python("default", "Import", "import.py"),),
+            arguments=(
+                arg_target("Dossier de l’évaluation"),
+                ArgumentSpec("refaire", "Mode refaire", "bool", "--refaire"),
+            ),
+        ),
+        StepDefinition(
+            "read_annotations",
+            "Finalisation",
+            "Lire les annotations manuscrites",
+            "Le mode doit correspondre au mode choisi lors de la génération des annotations.",
+            (
+                python("standard", "Lecture Bnot", "reading_annotations.py"),
+                python("grouped", "Lecture BGnot", "reading_grouped_annotations.py"),
+            ),
+            arguments=(
+                arg_target("Dossier de l’évaluation"),
+                ArgumentSpec("update_score", "Réappliquer les score.json", "bool", "--update-score"),
+                ArgumentSpec("refaire", "Mode refaire", "bool", "--refaire", variants=("grouped",)),
+            ),
+        ),
+        StepDefinition(
+            "giving_names",
+            "Finalisation",
+            "Attribuer les noms et préparer A Rendre",
+            "Crée le dossier A Rendre à partir du dossier d’annotations choisi.",
+            (python("default", "Attribution des noms", "giving_names.py"),),
+            arguments=(
+                arg_target("Dossier de l’évaluation"),
+                ArgumentSpec(
+                    "annotation_dir",
+                    "Dossier d’annotations",
+                    "choice",
+                    default="BGnot",
+                    choices=("BGnot", "Bnot", "Anot"),
+                    positional=True,
+                ),
+            ),
+            artifacts=("A Rendre",),
+        ),
+        StepDefinition(
+            "personal_create",
+            "Étapes personnelles",
+            "Créer l’interro dans gestion_classe",
+            "Exécute gestion_classe ne.",
+            (CommandVariant("default", "gestion_classe ne", "gestion_classe", "external", ("ne",)),),
+            personal=True,
+        ),
+        StepDefinition(
+            "personal_scale",
+            "Étapes personnelles",
+            "Renseigner le barème",
+            "Exécute gestion_classe we.",
+            (CommandVariant("default", "gestion_classe we", "gestion_classe", "external", ("we",)),),
+            personal=True,
+        ),
+        StepDefinition(
+            "update_ods",
+            "Étapes personnelles",
+            "Mettre à jour le fichier ODS",
+            "Transfère les scores, avec la possibilité de n’écrire que leur somme.",
+            (python("default", "Mise à jour ODS", "update_ods.py"),),
+            arguments=(
+                arg_target("Dossier de l’évaluation"),
+                ArgumentSpec("sum", "Écrire seulement la somme", "bool", "--sum"),
+            ),
+            personal=True,
+        ),
+        StepDefinition(
+            "personal_read",
+            "Étapes personnelles",
+            "Relire avec gestion_classe",
+            "Exécute gestion_classe re.",
+            (CommandVariant("default", "gestion_classe re", "gestion_classe", "external", ("re",)),),
+            personal=True,
+        ),
+        StepDefinition(
+            "personal_sent",
+            "Étapes personnelles",
+            "Marquer comme envoyé",
+            "Exécute gestion_classe wsent.",
+            (CommandVariant("default", "gestion_classe wsent", "gestion_classe", "external", ("wsent",)),),
+            personal=True,
+        ),
+        StepDefinition(
+            "final_score",
+            "Étapes personnelles",
+            "Ajouter le score final",
+            "Génère les fichiers de diffusion avec le score final.",
+            (python("default", "Score final", "add_final_score.py"),),
+            arguments=(arg_target("Dossier de l’évaluation"),),
+            personal=True,
+        ),
+        StepDefinition(
+            "personal_deploy",
+            "Étapes personnelles",
+            "Déployer et publier les copies",
+            "Étape manuelle : déployer miqmacs-copies-assets puis mettre à jour les copies depuis l’administration.",
+            (manual("deploy"),),
+            personal=True,
+        ),
+        StepDefinition(
+            "personal_print",
+            "Étapes personnelles",
+            "Imprimer une copie",
+            "Étape manuelle via le lecteur PDF.",
+            (manual("print"),),
+            personal=True,
+            optional=True,
+        ),
+    ]
+    return [step for step in steps if show_personal_steps or not step.personal]
+
+
+def value_for_default(value: object, evaluation_arg: str) -> object:
+    return evaluation_arg if value == EVALUATION else value
+
+
+def build_command(
+    repository: Path,
+    step: StepDefinition,
+    variant: CommandVariant,
+    values: dict[str, object],
+    evaluation_arg: str,
+    extra_arguments: str = "",
+) -> list[str]:
+    if variant.kind == "manual" or not variant.program:
+        return []
+
+    program_path = repository / variant.program
+    if variant.kind == "python":
+        command = [sys.executable, "-u", str(program_path)]
+    elif variant.kind == "shell":
+        command = [str(program_path)]
+    else:
+        command = [variant.program]
+
+    positionals: list[str] = []
+    options: list[str] = []
+    for spec in step.arguments:
+        if spec.variants and variant.id not in spec.variants:
+            continue
+        value = values.get(spec.name, value_for_default(spec.default, evaluation_arg))
+        if spec.kind == "bool":
+            if bool(value) and spec.flag:
+                options.append(spec.flag)
+            continue
+        if value is None or str(value).strip() == "":
+            continue
+        rendered = str(value)
+        if spec.positional:
+            positionals.append(rendered)
+        elif spec.flag:
+            options.extend((spec.flag, rendered))
+
+    command.extend(positionals)
+    command.extend(variant.fixed_args)
+    command.extend(options)
+    if extra_arguments.strip():
+        command.extend(shlex.split(extra_arguments, posix=os.name != "nt"))
+    return command
+
+
+def command_display(command: Iterable[str]) -> str:
+    if os.name == "nt":
+        return " ".join(f'"{part}"' if " " in part else part for part in command)
+    return shlex.join(command)
+
+
+def evaluation_argument(repository: Path, evaluation: Path) -> str:
+    try:
+        return str(evaluation.resolve().relative_to(repository.resolve()))
+    except ValueError:
+        return str(evaluation.resolve())
diff --git a/gui.py b/gui.py
new file mode 100644
index 0000000..17cde64
--- /dev/null
+++ b/gui.py
@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+
+from copienator_gui.app import CopienatorApp
+
+
+def personal_steps_enabled() -> bool:
+    try:
+        from config import SHOW_PERSONAL_STEPS
+    except (ImportError, AttributeError):
+        try:
+            from default_config import SHOW_PERSONAL_STEPS
+        except (ImportError, AttributeError):
+            return False
+    return bool(SHOW_PERSONAL_STEPS)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="Interface graphique du workflow Copienator")
+    parser.add_argument("evaluation", nargs="?", type=Path, help="Dossier d’évaluation à ouvrir")
+    args = parser.parse_args()
+
+    repository = Path(__file__).resolve().parent
+    evaluation = args.evaluation.resolve() if args.evaluation else None
+    app = CopienatorApp(repository, personal_steps_enabled(), evaluation)
+    app.mainloop()
+
+
+if __name__ == "__main__":
+    main()