diff --git a/DESIGN_SYSTEM.md b/DESIGN_SYSTEM.md
index 27605ca..7e4b4b1 100644
--- a/DESIGN_SYSTEM.md
+++ b/DESIGN_SYSTEM.md
@@ -188,6 +188,7 @@ Style courant :
 - hover violet/violet clair moins intense que les cards ;
 - pas de mouvement au hover ;
 - contenu interne au-dessus des pseudo-bordures via `z-index`.
+- chevron de repli tout à droite de l'en-tête ; l'état replié conserve uniquement l'en-tête visible et retire son séparateur bas.
 
 Le mot visible cote utilisateur est **outil**, pas **module**. Le terme module reste acceptable uniquement dans le code.
 
diff --git a/docs/STORAGE_SCHEMA.md b/docs/STORAGE_SCHEMA.md
index e156cbb..a74140e 100644
--- a/docs/STORAGE_SCHEMA.md
+++ b/docs/STORAGE_SCHEMA.md
@@ -113,7 +113,8 @@ Les toolboxes sont stockées dans `kv/toolboxes`.
     {
       "id": "mod1",
       "type": "checklist",
-      "title": "Armures"
+      "title": "Armures",
+      "collapsed": true
     }
   ],
   "moduleColumns": 2,
@@ -137,6 +138,7 @@ Notes :
 - Chaque identifiant d'outil présent dans `modules` doit apparaître exactement une fois dans `moduleOrder.one` et exactement une fois dans l'une des deux colonnes de `moduleOrder.two`.
 - Si une ancienne toolbox n'a pas encore `moduleOrder.two`, les outils sont répartis automatiquement depuis l'ordre une colonne avec une moitié en colonne gauche et une moitié en colonne droite.
 - Les données lourdes des outils ne sont pas stockées dans la toolbox, mais dans `modules`.
+- `modules[].collapsed` vaut `true` lorsque seul l'en-tête de l'outil est affiché ; il est omis lorsque l'outil est déplié.
 - `tutorial` est un indicateur temporaire réservé aux toolboxes créées depuis la prise en main. Il déclenche les premiers repères à l'ouverture, puis il est retiré automatiquement du stockage.
 
 ## Liens Jeu / Toolbox
diff --git a/tests/static-toolboxes.test.mjs b/tests/static-toolboxes.test.mjs
index c4f747f..a1ef905 100644
--- a/tests/static-toolboxes.test.mjs
+++ b/tests/static-toolboxes.test.mjs
@@ -92,7 +92,8 @@ test("toolbox module registry and modules expose expected behavior", async () =>
   const moduleComponents = await readFile("website/src/features/toolboxes/modules/toolboxModuleComponents.jsx", "utf8");
   const addToolControls = await readFile("website/src/features/toolboxes/modules/AddToolControls.jsx", "utf8");
   const toolboxModules = await readFile("website/src/features/toolboxes/modules/ToolboxModules.jsx", "utf8");
-  const moduleRegistryBundle = `${moduleRegistry}\n${moduleComponents}\n${addToolControls}\n${toolboxModules}`;
+  const moduleShell = await readFile("website/src/features/toolboxes/modules/ModuleShell.jsx", "utf8");
+  const moduleRegistryBundle = `${moduleRegistry}\n${moduleComponents}\n${addToolControls}\n${toolboxModules}\n${moduleShell}`;
   const moduleMetadataRegistry = await readFile("website/src/features/toolboxes/toolboxModuleRegistry.js", "utf8");
   const notepadModule = await readFile("website/src/features/toolboxes/modules/NotepadModule.jsx", "utf8");
   const notepadToolbar = await readFile("website/src/features/toolboxes/modules/NotepadToolbar.jsx", "utf8");
@@ -189,6 +190,7 @@ test("toolbox module registry and modules expose expected behavior", async () =>
   [
     ["AddToolControls.jsx", addToolControls],
     ["ToolboxModules.jsx", toolboxModules],
+    ["ModuleShell.jsx", moduleShell],
     ["useCalendarController.js", calendarController],
     ["useCalendarDraftControls.js", calendarDraftControls],
     ["calendarEventActions.js", calendarEventActions],
@@ -212,21 +214,24 @@ test("toolbox module registry and modules expose expected behavior", async () =>
   assert.match(moduleRegistry, /export \{ AddToolControls \}/);
   assert.match(moduleRegistry, /export \{ ToolboxModules \}/);
   assert.match(moduleComponents, /MODULE_COMPONENTS/);
-  assert.match(toolboxModules, /Suspense fallback=\{<ModuleLoadingFallback label=\{label\} \/>\}/);
+  assert.match(moduleShell, /Suspense fallback=\{<ModuleLoadingFallback label=\{label\} \/>\}/);
   assert.match(moduleMetadataRegistry, /Planificateur d'équipements/);
   assert.match(moduleMetadataRegistry, /Annotation d'images/);
-  assert.match(toolboxModules, /module-edit-button/);
-  assert.match(toolboxModules, /itemReorder\.startDrag/);
+  assert.match(moduleShell, /module-edit-button/);
+  assert.match(moduleShell, /itemReorder\.startDrag/);
   assert.match(moduleRegistryBundle, /onPointerDown/);
   assert.match(toolboxModules, /useGroupedReorder/);
-  assert.match(toolboxModules, /useInlineEdit/);
-  assert.match(toolboxModules, /getContentEditableProps/);
+  assert.match(moduleShell, /useInlineEdit/);
+  assert.match(moduleShell, /getContentEditableProps/);
   assert.match(addToolControls, /tool-add-card/);
   assert.match(addToolControls, /tool-quick-add-button/);
   assert.match(addToolControls, /tool-add-quick-toggle/);
   assert.match(moduleMetadataRegistry, /scrollable: true/);
-  assert.match(toolboxModules, /module-content/);
-  assert.match(toolboxModules, /module-scroll-button/);
+  assert.match(moduleShell, /module-content/);
+  assert.match(moduleShell, /module-scroll-button/);
+  assert.match(moduleShell, /module-collapse-button/);
+  assert.match(moduleShell, /aria-expanded=\{!collapsed\}/);
+  assert.match(moduleShell, /!collapsed &&/);
   assert.match(addToolControls, /Icon name="dropdown"/);
   assert.match(addToolControls, /CompactDropdown/);
   assert.doesNotMatch(source, /<select value="" onChange=\{\(event\) => addModule/);
diff --git a/tests/toolbox-modules.test.mjs b/tests/toolbox-modules.test.mjs
index bc79f3d..3841ecf 100644
--- a/tests/toolbox-modules.test.mjs
+++ b/tests/toolbox-modules.test.mjs
@@ -968,6 +968,19 @@ test("toolbox module order normalizes one and two column layouts", () => {
   }, modules).two, [["a", "b", "c", "d"], []]);
 });
 
+test("toolbox modules preserve only active shell display options", () => {
+  const toolbox = normalizeToolbox({
+    modules: [
+      { id: "collapsed", type: "notepad", collapsed: true, scrollable: true },
+      { id: "expanded", type: "links", collapsed: false }
+    ]
+  });
+
+  assert.equal(toolbox.modules[0].collapsed, true);
+  assert.equal(toolbox.modules[0].scrollable, true);
+  assert.equal("collapsed" in toolbox.modules[1], false);
+});
+
 test("toolbox export remaps module order ids", () => {
   const payload = createToolboxExportPayload(
     {
diff --git a/website/src/features/toolboxes/modules/ModuleShell.jsx b/website/src/features/toolboxes/modules/ModuleShell.jsx
new file mode 100644
index 0000000..8166c37
--- /dev/null
+++ b/website/src/features/toolboxes/modules/ModuleShell.jsx
@@ -0,0 +1,186 @@
+// Rôle : rend l'en-tête, les contrôles et le contenu repliable d'un outil toolbox.
+import { Suspense, useState } from "react";
+import { Icon } from "../../../components/Icon.jsx";
+import { useInlineEdit } from "../../../hooks/useInlineEdit.js";
+import { GuideChecklistControls, GuideChecklistToggle } from "../../games/GuideChecklistControls.jsx";
+import { useGuideChecklistPanel } from "../../games/useGuideChecklist.js";
+import { ModuleDataGate, ModuleLoadingFallback } from "./ModuleDataGate.jsx";
+import { supportsTextExchange } from "./textImport.js";
+import { MODULE_COMPONENTS } from "./toolboxModuleComponents.jsx";
+
+export function ModuleShell({ toolbox, module, context, reorder, itemGroup = "", onRename, onUpdateModule, onDelete }) {
+  const definition = MODULE_COMPONENTS[module.type] || MODULE_COMPONENTS.notepad;
+  const Component = definition.Component;
+  const label = definition.label || module.type;
+  const [editing, setEditing] = useState(false);
+  const [textExchangeOpen, setTextExchangeOpen] = useState(false);
+  const guidePanel = useGuideChecklistPanel(context.guideChecklist, module);
+  const hasAddPanel = definition.editable && definition.addable !== false;
+  const hasTextExchange = supportsTextExchange(module.type);
+  const scrollable = definition.scrollable && module.scrollable === true;
+  const collapsed = module.collapsed === true;
+  const className = [
+    "module",
+    reorder.isItemDragging(module.id) ? "is-dragging" : "",
+    reorder.isItemDropTarget(module.id) ? "is-drop-target" : "",
+    reorder.getDropPlacement("item", module.id) === "after" ? "drop-after" : "",
+    scrollable ? "is-scrollable" : "",
+    collapsed ? "is-collapsed" : ""
+  ].filter(Boolean).join(" ");
+  const componentProps = {
+    toolboxId: toolbox.id,
+    moduleId: module.id,
+    context,
+    editing,
+    setEditing,
+    openEditor: () => {
+      setTextExchangeOpen(false);
+      setEditing(true);
+    },
+    textExchangeOpen
+  };
+
+  function toggleCollapsed() {
+    if (!collapsed) {
+      setEditing(false);
+      setTextExchangeOpen(false);
+    }
+    onUpdateModule(module.id, (currentModule) => {
+      const nextModule = { ...currentModule };
+      if (collapsed) {
+        delete nextModule.collapsed;
+      } else {
+        nextModule.collapsed = true;
+      }
+      return nextModule;
+    });
+  }
+
+  return (
+    <article
+      className={className}
+      data-module-type={module.type}
+      {...reorder.getItemProps({ itemId: module.id, groupId: itemGroup, parentId: toolbox.id })}
+    >
+      <header>
+        <div>
+          <button
+            className="module-drag-handle nds-icon-button"
+            data-size="md"
+            data-variant="secondary"
+            type="button"
+            onPointerDown={(event) => reorder.itemReorder.startDrag(event, module.id)}
+            aria-label={`Déplacer ${module.title || label}`}
+            title="Déplacer"
+          >
+            <Icon name="drag" />
+          </button>
+          <span className="module-icon" aria-hidden="true">
+            <span className={`module-icon-svg module-icon-${definition.icon || "notepad"}`} />
+          </span>
+          <EditableModuleTitle value={module.title || label} fallback={label} tutorialTarget={module.type === "memos" ? "moduleTitle" : ""} onSave={(title) => onRename(module.id, title)} />
+        </div>
+        <div>
+          {definition.scrollable && (
+            <button
+              className={`module-scroll-button nds-switch ${scrollable ? "active" : ""}`}
+              data-size="lg"
+              onClick={() => onUpdateModule(module.id, (currentModule) => {
+                const nextModule = { ...currentModule };
+                if (scrollable) {
+                  delete nextModule.scrollable;
+                } else {
+                  nextModule.scrollable = true;
+                }
+                return nextModule;
+              })}
+              aria-label={`${scrollable ? "Désactiver" : "Activer"} le scroll de ${module.title || label}`}
+              aria-pressed={scrollable}
+              title={scrollable ? "Désactiver le scroll" : "Activer le scroll"}
+            >
+              <Icon name="scrollable" />
+              <i aria-hidden="true" />
+            </button>
+          )}
+          {hasAddPanel && (
+            <button
+              className={`module-edit-button nds-icon-button ${editing ? "active" : ""}`}
+              data-size="md"
+              onClick={() => setEditing((value) => {
+                const nextEditing = !value;
+                if (nextEditing) setTextExchangeOpen(false);
+                return nextEditing;
+              })}
+              aria-label={`${editing ? "Masquer" : "Afficher"} l'ajout de ${module.title || label}`}
+              aria-pressed={editing}
+              title={editing ? "Masquer l'ajout" : "Ajouter"}
+            >
+              <Icon name="add" />
+            </button>
+          )}
+          <GuideChecklistToggle checklist={context.guideChecklist} panel={guidePanel} label={module.title || label} />
+          {hasTextExchange && (
+            <button
+              className={`module-exchange-button nds-icon-button ${textExchangeOpen ? "active" : ""}`}
+              data-size="md"
+              onClick={() => setTextExchangeOpen((value) => {
+                const nextOpen = !value;
+                if (nextOpen) setEditing(false);
+                return nextOpen;
+              })}
+              aria-label={`${textExchangeOpen ? "Masquer" : "Afficher"} l'import/export de ${module.title || label}`}
+              aria-pressed={textExchangeOpen}
+              title={textExchangeOpen ? "Masquer import/export" : "Import / export"}
+            >
+              <Icon name="import" />
+            </button>
+          )}
+          <button className="module-delete-button nds-icon-button" data-size="md" data-variant="danger" onClick={() => onDelete(module.id)} aria-label={`Retirer ${module.title || label}`} data-toolbox-tutorial-target={module.type === "links" ? "deleteTool" : undefined} title="Retirer">
+            <span className="ui-icon ui-icon-trash" aria-hidden="true" />
+          </button>
+          <button
+            className="module-collapse-button nds-icon-button"
+            data-size="md"
+            type="button"
+            onClick={toggleCollapsed}
+            aria-expanded={!collapsed}
+            aria-label={`${collapsed ? "Afficher" : "Masquer"} ${module.title || label}`}
+            title={collapsed ? "Afficher l’outil" : "Masquer l’outil"}
+          >
+            <Icon name={collapsed ? "chevron-down" : "chevron-up"} />
+          </button>
+        </div>
+      </header>
+      {!collapsed && (
+        <div className={`module-content ${scrollable ? "is-scrollable legacy-scrollbar" : ""}`}>
+          <GuideChecklistControls checklist={context.guideChecklist} {...guidePanel} />
+          <Suspense fallback={<ModuleLoadingFallback label={label} />}>
+            <ModuleDataGate key={`${toolbox.id}:${module.id}`} context={context} toolboxId={toolbox.id} moduleId={module.id}>
+              <Component {...componentProps} />
+            </ModuleDataGate>
+          </Suspense>
+        </div>
+      )}
+    </article>
+  );
+}
+
+function EditableModuleTitle({ value, fallback, onSave, tutorialTarget = "" }) {
+  const inlineEdit = useInlineEdit({
+    value,
+    onCommit: (title) => onSave(title || fallback),
+    blurOnEscape: true
+  });
+
+  return (
+    <h2
+      {...inlineEdit.getContentEditableProps({
+        className: "module-title",
+        "data-toolbox-tutorial-target": tutorialTarget || undefined,
+        title: "Cliquer pour renommer"
+      })}
+    >
+      {value}
+    </h2>
+  );
+}
diff --git a/website/src/features/toolboxes/modules/ToolboxModules.jsx b/website/src/features/toolboxes/modules/ToolboxModules.jsx
index 6ea8144..389300e 100644
--- a/website/src/features/toolboxes/modules/ToolboxModules.jsx
+++ b/website/src/features/toolboxes/modules/ToolboxModules.jsx
@@ -1,13 +1,7 @@
-// Rôle : rend les modules d'une toolbox, leur shell commun et leur réorganisation.
-import { Suspense, useMemo, useState } from "react";
-import { Icon } from "../../../components/Icon.jsx";
-import { GuideChecklistControls, GuideChecklistToggle } from "../../games/GuideChecklistControls.jsx";
-import { useGuideChecklistPanel } from "../../games/useGuideChecklist.js";
+// Rôle : répartit et réorganise les modules d'une toolbox dans leurs colonnes.
+import { useMemo } from "react";
 import { useGroupedReorder } from "../../../hooks/useGroupedReorder.js";
-import { useInlineEdit } from "../../../hooks/useInlineEdit.js";
-import { supportsTextExchange } from "./textImport.js";
-import { MODULE_COMPONENTS } from "./toolboxModuleComponents.jsx";
-import { ModuleDataGate, ModuleLoadingFallback } from "./ModuleDataGate.jsx";
+import { ModuleShell } from "./ModuleShell.jsx";
 
 const MODULE_COLUMN_IDS = ["left", "right"];
 
@@ -148,149 +142,3 @@ export function ToolboxModules({ toolbox, moduleColumns, context, onRename, onUp
     </section>
   );
 }
-
-function ModuleShell({ toolbox, module, context, reorder, itemGroup = "", onRename, onUpdateModule, onDelete }) {
-  const definition = MODULE_COMPONENTS[module.type] || MODULE_COMPONENTS.notepad;
-  const Component = definition.Component;
-  const label = definition.label || module.type;
-  const [editing, setEditing] = useState(false);
-  const [textExchangeOpen, setTextExchangeOpen] = useState(false);
-  const guidePanel = useGuideChecklistPanel(context.guideChecklist, module);
-  const hasAddPanel = definition.editable && definition.addable !== false;
-  const hasTextExchange = supportsTextExchange(module.type);
-  const scrollable = definition.scrollable && module.scrollable === true;
-  const className = [
-    "module",
-    reorder.isItemDragging(module.id) ? "is-dragging" : "",
-    reorder.isItemDropTarget(module.id) ? "is-drop-target" : "",
-    reorder.getDropPlacement("item", module.id) === "after" ? "drop-after" : "",
-    scrollable ? "is-scrollable" : ""
-  ].filter(Boolean).join(" ");
-  const componentProps = {
-    toolboxId: toolbox.id,
-    moduleId: module.id,
-    context,
-    editing,
-    setEditing,
-    openEditor: () => {
-      setTextExchangeOpen(false);
-      setEditing(true);
-    },
-    textExchangeOpen
-  };
-
-  return (
-    <article
-      className={className}
-      data-module-type={module.type}
-      {...reorder.getItemProps({ itemId: module.id, groupId: itemGroup, parentId: toolbox.id })}
-    >
-      <header>
-        <div>
-          <button
-            className="module-drag-handle nds-icon-button"
-            data-size="md"
-            data-variant="secondary"
-            type="button"
-            onPointerDown={(event) => reorder.itemReorder.startDrag(event, module.id)}
-            aria-label={`Déplacer ${module.title || label}`}
-            title="Déplacer"
-          >
-            <Icon name="drag" />
-          </button>
-          <span className="module-icon" aria-hidden="true">
-            <span className={`module-icon-svg module-icon-${definition.icon || "notepad"}`} />
-          </span>
-          <EditableModuleTitle value={module.title || label} fallback={label} tutorialTarget={module.type === "memos" ? "moduleTitle" : ""} onSave={(title) => onRename(module.id, title)} />
-        </div>
-        <div>
-          {definition.scrollable && (
-            <button
-              className={`module-scroll-button nds-switch ${scrollable ? "active" : ""}`}
-              data-size="lg"
-              onClick={() => onUpdateModule(module.id, (currentModule) => {
-                const nextModule = { ...currentModule };
-                if (scrollable) {
-                  delete nextModule.scrollable;
-                } else {
-                  nextModule.scrollable = true;
-                }
-                return nextModule;
-              })}
-              aria-label={`${scrollable ? "Désactiver" : "Activer"} le scroll de ${module.title || label}`}
-              aria-pressed={scrollable}
-              title={scrollable ? "Désactiver le scroll" : "Activer le scroll"}
-            >
-              <Icon name="scrollable" />
-              <i aria-hidden="true" />
-            </button>
-          )}
-          {hasAddPanel && (
-            <button
-              className={`module-edit-button nds-icon-button ${editing ? "active" : ""}`}
-              data-size="md"
-              onClick={() => setEditing((value) => {
-                const nextEditing = !value;
-                if (nextEditing) setTextExchangeOpen(false);
-                return nextEditing;
-              })}
-              aria-label={`${editing ? "Masquer" : "Afficher"} l'ajout de ${module.title || label}`}
-              aria-pressed={editing}
-              title={editing ? "Masquer l'ajout" : "Ajouter"}
-            >
-              <Icon name="add" />
-            </button>
-          )}
-          <GuideChecklistToggle checklist={context.guideChecklist} panel={guidePanel} label={module.title || label} />
-          {hasTextExchange && (
-            <button
-              className={`module-exchange-button nds-icon-button ${textExchangeOpen ? "active" : ""}`}
-              data-size="md"
-              onClick={() => setTextExchangeOpen((value) => {
-                const nextOpen = !value;
-                if (nextOpen) setEditing(false);
-                return nextOpen;
-              })}
-              aria-label={`${textExchangeOpen ? "Masquer" : "Afficher"} l'import/export de ${module.title || label}`}
-              aria-pressed={textExchangeOpen}
-              title={textExchangeOpen ? "Masquer import/export" : "Import / export"}
-            >
-              <Icon name="import" />
-            </button>
-          )}
-          <button className="module-delete-button nds-icon-button" data-size="md" data-variant="danger" onClick={() => onDelete(module.id)} aria-label={`Retirer ${module.title || label}`} data-toolbox-tutorial-target={module.type === "links" ? "deleteTool" : undefined} title="Retirer">
-            <span className="ui-icon ui-icon-trash" aria-hidden="true" />
-          </button>
-        </div>
-      </header>
-      <div className={`module-content ${scrollable ? "is-scrollable legacy-scrollbar" : ""}`}>
-        <GuideChecklistControls checklist={context.guideChecklist} {...guidePanel} />
-        <Suspense fallback={<ModuleLoadingFallback label={label} />}>
-          <ModuleDataGate key={`${toolbox.id}:${module.id}`} context={context} toolboxId={toolbox.id} moduleId={module.id}>
-            <Component {...componentProps} />
-          </ModuleDataGate>
-        </Suspense>
-      </div>
-    </article>
-  );
-}
-
-function EditableModuleTitle({ value, fallback, onSave, tutorialTarget = "" }) {
-  const inlineEdit = useInlineEdit({
-    value,
-    onCommit: (title) => onSave(title || fallback),
-    blurOnEscape: true
-  });
-
-  return (
-    <h2
-      {...inlineEdit.getContentEditableProps({
-        className: "module-title",
-        "data-toolbox-tutorial-target": tutorialTarget || undefined,
-        title: "Cliquer pour renommer"
-      })}
-    >
-      {value}
-    </h2>
-  );
-}
diff --git a/website/src/features/toolboxes/storage/toolboxStorage.js b/website/src/features/toolboxes/storage/toolboxStorage.js
index 4029c03..1904846 100644
--- a/website/src/features/toolboxes/storage/toolboxStorage.js
+++ b/website/src/features/toolboxes/storage/toolboxStorage.js
@@ -65,6 +65,7 @@ function normalizeToolboxModule(module) {
   const normalized = { id: module.id || uid("mod"), type: module.type };
   if (title && title !== getDefaultModuleTitle(module.type)) normalized.title = title;
   if (module.scrollable === true) normalized.scrollable = true;
+  if (module.collapsed === true) normalized.collapsed = true;
   return normalized;
 }
 
diff --git a/website/src/styles/toolboxes/_module-shell.scss b/website/src/styles/toolboxes/_module-shell.scss
index dece673..04a69e5 100644
--- a/website/src/styles/toolboxes/_module-shell.scss
+++ b/website/src/styles/toolboxes/_module-shell.scss
@@ -26,6 +26,10 @@
   min-width: 0;
 }
 
+.module.is-collapsed header {
+  border-bottom-color: transparent;
+}
+
 .module-loading-fallback {
   padding: var(--space-4);
   border: 1px solid var(--color-border);
@@ -84,12 +88,14 @@
 
 .module-edit-button,
 .module-exchange-button,
-.module-delete-button {
+.module-delete-button,
+.module-collapse-button {
   flex: 0 0 40px;
 }
 
 .module-edit-button,
-.module-exchange-button {
+.module-exchange-button,
+.module-collapse-button {
   color: var(--color-text-secondary);
 }