diff --git a/README.md b/README.md
index e5738c2..69e5116 100644
--- a/README.md
+++ b/README.md
@@ -143,7 +143,8 @@ Le socle actuel comprend notamment :
 - détection de présence et de version ;
 - menu OSINT contextuel préparé pour les entités et relations du graphe ;
 - contexte de sélection OSINT indépendant de GTK et validé par des tests ;
-- catalogue déterministe des actions compatibles avec la sélection OSINT.
+- catalogue déterministe des actions compatibles avec la sélection OSINT ;
+- disponibilité des actions OSINT synchronisée avec le registre d’outils.
 
 Les outils actuellement présents dans le catalogue initial sont :
 
diff --git a/include/models/osint_action_catalog.h b/include/models/osint_action_catalog.h
index 41f646b..7df961f 100644
--- a/include/models/osint_action_catalog.h
+++ b/include/models/osint_action_catalog.h
@@ -18,6 +18,15 @@ typedef struct OsintAction OsintAction;
 /** @brief Catalogue opaque possédant ses actions. */
 typedef struct OsintActionCatalog OsintActionCatalog;
 
+/** @brief État d'une dépendance externe vu par le catalogue OSINT. */
+typedef enum
+{
+    OSINT_ACTION_TOOL_STATE_UNKNOWN,
+    OSINT_ACTION_TOOL_STATE_AVAILABLE,
+    OSINT_ACTION_TOOL_STATE_MISSING,
+    OSINT_ACTION_TOOL_STATE_INCOMPATIBLE
+} OsintActionToolState;
+
 /**
  * @brief Crée le catalogue initial déterministe.
  *
@@ -48,6 +57,21 @@ GPtrArray *osint_action_catalog_list_compatible(
     const OsintSelectionContext *context
 );
 
+/**
+ * @brief Actualise les actions dépendant d'un outil externe.
+ *
+ * @param catalog Catalogue à modifier.
+ * @param tool_identifier Identifiant stable de l'outil.
+ * @param state État traduit par la couche applicative.
+ * @param version Version détectée facultative.
+ */
+void osint_action_catalog_update_tool_state(
+    OsintActionCatalog *catalog,
+    const char *tool_identifier,
+    OsintActionToolState state,
+    const char *version
+);
+
 /** @brief Retourne l'identifiant stable emprunté d'une action. */
 const char *osint_action_get_identifier(const OsintAction *action);
 
@@ -68,6 +92,9 @@ gboolean osint_action_is_available(const OsintAction *action);
 /** @brief Retourne l'explication d'indisponibilité, ou NULL. */
 const char *osint_action_get_unavailable_reason(const OsintAction *action);
 
+/** @brief Retourne la version copiée de l'outil requis, ou NULL. */
+const char *osint_action_get_tool_version(const OsintAction *action);
+
 G_END_DECLS
 
 #endif
diff --git a/include/views/main_window.h b/include/views/main_window.h
index 0492c28..a6a991a 100644
--- a/include/views/main_window.h
+++ b/include/views/main_window.h
@@ -12,6 +12,7 @@
 #include "core/task_manager.h"
 #include "widgets/evidence_category_model.h"
 #include "models/evidence_record.h"
+#include "models/osint_action_catalog.h"
 
 #include <gtk/gtk.h>
 
@@ -403,6 +404,21 @@ void main_window_set_status(
     const char *status_text
 );
 
+/**
+ * @brief Transmet au workspace l'état d'un outil OSINT externe.
+ *
+ * @param main_window Fenêtre principale.
+ * @param tool_identifier Identifiant stable de l'outil.
+ * @param state État traduit par l'application.
+ * @param version Version détectée facultative.
+ */
+void main_window_set_osint_tool_state(
+    MainWindow *main_window,
+    const char *tool_identifier,
+    OsintActionToolState state,
+    const char *version
+);
+
 /**
  * @brief Callback appelé lorsque l'utilisateur demande l'ouverture
  *        d'une enquête existante.
diff --git a/include/widgets/workspace.h b/include/widgets/workspace.h
index 8555183..b13375d 100644
--- a/include/widgets/workspace.h
+++ b/include/widgets/workspace.h
@@ -8,6 +8,7 @@
 
 #include "core/investigation_node.h"
 #include "models/evidence_record.h"
+#include "models/osint_action_catalog.h"
 
 #include <gtk/gtk.h>
 
@@ -155,6 +156,21 @@ gboolean workspace_select_graph_relation(
     const char *relation_identifier
 );
 
+/**
+ * @brief Actualise l'état d'un outil requis par les actions OSINT.
+ *
+ * @param workspace Zone de travail.
+ * @param tool_identifier Identifiant stable de l'outil.
+ * @param state État traduit par la couche applicative.
+ * @param version Version détectée facultative.
+ */
+void workspace_set_osint_tool_state(
+    Workspace *workspace,
+    const char *tool_identifier,
+    OsintActionToolState state,
+    const char *version
+);
+
 /**
  * @brief Définit le callback de vérification de la preuve affichée.
  *
diff --git a/src/core/application.c b/src/core/application.c
index ead615a..10ef095 100644
--- a/src/core/application.c
+++ b/src/core/application.c
@@ -729,6 +729,42 @@ static void application_present_error(
     const char *message
 );
 
+/**
+ * @brief Publie dans l'interface les états du registre d'outils.
+ */
+static void application_publish_osint_tool_states(
+    Application *application
+)
+{
+    ToolRegistry *tool_registry = NULL;
+    gsize tool_index = 0;
+
+    if (application == NULL || application->main_window == NULL ||
+        application->tool_initializer == NULL)
+    {
+        return;
+    }
+
+    tool_registry = tool_initializer_get_registry(application->tool_initializer);
+    for (tool_index = 0;
+         tool_registry != NULL && tool_index < tool_registry_get_count(tool_registry);
+         tool_index++)
+    {
+        const ToolInfo *tool_info = tool_registry_get_tool(tool_registry, tool_index);
+        OsintActionToolState state = OSINT_ACTION_TOOL_STATE_UNKNOWN;
+        if (tool_info_get_availability(tool_info) == TOOL_AVAILABILITY_AVAILABLE)
+            state = OSINT_ACTION_TOOL_STATE_AVAILABLE;
+        else if (tool_info_get_availability(tool_info) == TOOL_AVAILABILITY_MISSING)
+            state = OSINT_ACTION_TOOL_STATE_MISSING;
+        main_window_set_osint_tool_state(
+            application->main_window,
+            tool_info_get_identifier(tool_info),
+            state,
+            tool_info_get_detected_version(tool_info)
+        );
+    }
+}
+
 /**
  * @brief Traite la fin de l’initialisation des outils externes.
  *
@@ -828,6 +864,8 @@ static void application_on_tool_initialization_completed(
 
             break;
     }
+
+    application_publish_osint_tool_states(application);
 }
 
 /**
diff --git a/src/models/osint_action_catalog.c b/src/models/osint_action_catalog.c
index 5d9d29e..ef5d3f5 100644
--- a/src/models/osint_action_catalog.c
+++ b/src/models/osint_action_catalog.c
@@ -15,6 +15,7 @@ struct OsintAction
     char *required_tool_identifier;
     gboolean available;
     char *unavailable_reason;
+    char *tool_version;
 };
 
 struct OsintActionCatalog
@@ -28,6 +29,7 @@ static void osint_action_free(gpointer data)
     OsintAction *action = data;
     if (action == NULL) return;
     g_free(action->unavailable_reason);
+    g_free(action->tool_version);
     g_free(action->compatible_type);
     g_free(action->required_tool_identifier);
     g_free(action->description);
@@ -83,8 +85,8 @@ OsintActionCatalog *osint_action_catalog_new_defaults(void)
     dns_action = osint_action_new(
         "dns-preview", "Résolution DNS",
         "Préfiguration de l'adaptateur DNS.",
-        OSINT_SELECTION_CONTEXT_KIND_ENTITY, "domain", "dig", FALSE,
-        "L'adaptateur DNS n'est pas encore intégré."
+        OSINT_SELECTION_CONTEXT_KIND_ENTITY, "domain_name", "dns.dig", FALSE,
+        "L'outil requis n'a pas encore été vérifié."
     );
     if (catalog->actions == NULL || demonstration_action == NULL ||
         dns_action == NULL)
@@ -134,6 +136,35 @@ GPtrArray *osint_action_catalog_list_compatible(
     return compatible_actions;
 }
 
+void osint_action_catalog_update_tool_state(
+    OsintActionCatalog *catalog,
+    const char *tool_identifier,
+    OsintActionToolState state,
+    const char *version
+)
+{
+    guint index = 0;
+    if (catalog == NULL || catalog->actions == NULL ||
+        tool_identifier == NULL || tool_identifier[0] == '\0') return;
+    for (index = 0; index < catalog->actions->len; index++)
+    {
+        OsintAction *action = g_ptr_array_index(catalog->actions, index);
+        if (g_strcmp0(action->required_tool_identifier, tool_identifier) != 0)
+            continue;
+        g_clear_pointer(&action->tool_version, g_free);
+        g_clear_pointer(&action->unavailable_reason, g_free);
+        action->available = state == OSINT_ACTION_TOOL_STATE_AVAILABLE;
+        if (action->available)
+            action->tool_version = g_strdup(version);
+        else if (state == OSINT_ACTION_TOOL_STATE_MISSING)
+            action->unavailable_reason = g_strdup("L'outil requis est absent.");
+        else if (state == OSINT_ACTION_TOOL_STATE_INCOMPATIBLE)
+            action->unavailable_reason = g_strdup("La version installée est incompatible.");
+        else
+            action->unavailable_reason = g_strdup("L'outil requis n'a pas encore été vérifié.");
+    }
+}
+
 void osint_action_catalog_free(OsintActionCatalog *catalog)
 {
     if (catalog == NULL) return;
@@ -153,3 +184,5 @@ gboolean osint_action_is_available(const OsintAction *action)
 { return action != NULL && action->available; }
 const char *osint_action_get_unavailable_reason(const OsintAction *action)
 { return action != NULL ? action->unavailable_reason : NULL; }
+const char *osint_action_get_tool_version(const OsintAction *action)
+{ return action != NULL ? action->tool_version : NULL; }
diff --git a/src/views/main_window.c b/src/views/main_window.c
index f65d69f..01acb82 100644
--- a/src/views/main_window.c
+++ b/src/views/main_window.c
@@ -1225,6 +1225,26 @@ void main_window_set_status(
     );
 }
 
+void main_window_set_osint_tool_state(
+    MainWindow *main_window,
+    const char *tool_identifier,
+    OsintActionToolState state,
+    const char *version
+)
+{
+    if (main_window == NULL)
+    {
+        return;
+    }
+
+    workspace_set_osint_tool_state(
+        main_window->workspace,
+        tool_identifier,
+        state,
+        version
+    );
+}
+
 void main_window_set_tree_selection_callback(
     MainWindow *main_window,
     InvestigationTreeViewSelectionCallback callback,
diff --git a/src/widgets/workspace.c b/src/widgets/workspace.c
index 0870e80..b8b6d1b 100644
--- a/src/widgets/workspace.c
+++ b/src/widgets/workspace.c
@@ -259,9 +259,13 @@ static void workspace_update_osint_tools_menu(
             compatible_actions,
             action_index
         );
-        GtkWidget *action_button = gtk_button_new_with_label(
-            osint_action_get_label(action)
-        );
+        const char *tool_version = osint_action_get_tool_version(action);
+        char *button_label = tool_version != NULL && tool_version[0] != '\0'
+            ? g_strdup_printf("%s — %s", osint_action_get_label(action), tool_version)
+            : g_strdup(osint_action_get_label(action));
+        GtkWidget *action_button = gtk_button_new_with_label(button_label);
+
+        g_free(button_label);
 
         if (action_button == NULL)
         {
@@ -2324,6 +2328,30 @@ gboolean workspace_select_graph_relation(
     );
 }
 
+void workspace_set_osint_tool_state(
+    Workspace *workspace,
+    const char *tool_identifier,
+    OsintActionToolState state,
+    const char *version
+)
+{
+    if (workspace == NULL || workspace->osint_action_catalog == NULL)
+    {
+        return;
+    }
+
+    osint_action_catalog_update_tool_state(
+        workspace->osint_action_catalog,
+        tool_identifier,
+        state,
+        version
+    );
+    workspace_update_osint_tools_menu(
+        workspace,
+        workspace->osint_selection_context
+    );
+}
+
 void workspace_set_graph_loading(
     Workspace *workspace
 )
diff --git a/tests/test_osint_action_catalog.c b/tests/test_osint_action_catalog.c
index e816634..ee0637d 100644
--- a/tests/test_osint_action_catalog.c
+++ b/tests/test_osint_action_catalog.c
@@ -18,7 +18,7 @@ static OsintSelectionContext *create_entity_context(const char *type)
 static void test_domain_actions(void)
 {
     OsintActionCatalog *catalog = osint_action_catalog_new_defaults();
-    OsintSelectionContext *context = create_entity_context("domain");
+    OsintSelectionContext *context = create_entity_context("domain_name");
     GPtrArray *actions = osint_action_catalog_list_compatible(catalog, context);
 
     g_assert_nonnull(actions);
@@ -28,7 +28,7 @@ static void test_domain_actions(void)
     g_assert_true(osint_action_is_available(g_ptr_array_index(actions, 0)));
     g_assert_false(osint_action_is_available(g_ptr_array_index(actions, 1)));
     g_assert_cmpstr(osint_action_get_required_tool_identifier(
-        g_ptr_array_index(actions, 1)), ==, "dig");
+        g_ptr_array_index(actions, 1)), ==, "dns.dig");
     g_assert_nonnull(osint_action_get_unavailable_reason(
         g_ptr_array_index(actions, 1)));
 
@@ -59,11 +59,40 @@ static void test_invalid_arguments(void)
     osint_action_catalog_free(NULL);
 }
 
+static void test_tool_states(void)
+{
+    OsintActionCatalog *catalog = osint_action_catalog_new_defaults();
+    OsintSelectionContext *context = create_entity_context("domain_name");
+    GPtrArray *actions = NULL;
+
+    osint_action_catalog_update_tool_state(
+        catalog, "dns.dig", OSINT_ACTION_TOOL_STATE_AVAILABLE, "DiG 9.20"
+    );
+    actions = osint_action_catalog_list_compatible(catalog, context);
+    g_assert_true(osint_action_is_available(g_ptr_array_index(actions, 1)));
+    g_assert_cmpstr(osint_action_get_tool_version(g_ptr_array_index(actions, 1)),
+        ==, "DiG 9.20");
+    g_ptr_array_unref(actions);
+
+    osint_action_catalog_update_tool_state(
+        catalog, "dns.dig", OSINT_ACTION_TOOL_STATE_MISSING, NULL
+    );
+    actions = osint_action_catalog_list_compatible(catalog, context);
+    g_assert_false(osint_action_is_available(g_ptr_array_index(actions, 1)));
+    g_assert_nonnull(osint_action_get_unavailable_reason(
+        g_ptr_array_index(actions, 1)));
+    g_ptr_array_unref(actions);
+
+    osint_selection_context_free(context);
+    osint_action_catalog_free(catalog);
+}
+
 int main(int argc, char **argv)
 {
     g_test_init(&argc, &argv, NULL);
     g_test_add_func("/osint-action-catalog/domain", test_domain_actions);
     g_test_add_func("/osint-action-catalog/non-domain", test_non_domain_actions);
     g_test_add_func("/osint-action-catalog/invalid", test_invalid_arguments);
+    g_test_add_func("/osint-action-catalog/tool-states", test_tool_states);
     return g_test_run();
 }