diff --git a/energyplugin/etm/scheduler/optimizerclient.cpp b/energyplugin/etm/scheduler/optimizerclient.cpp
index 12834c3..d337979 100644
--- a/energyplugin/etm/scheduler/optimizerclient.cpp
+++ b/energyplugin/etm/scheduler/optimizerclient.cpp
@@ -200,6 +200,18 @@ bool OptimizerClient::writeToken(const QString &path, const QByteArray &token, Q
     return true;
 }
 
+QStringList OptimizerClient::knownErrorCodes()
+{
+    return {QStringLiteral("invalid-endpoint"), QStringLiteral("token-too-short"),
+            QStringLiteral("connect-failed"), QStringLiteral("closed-during-handshake"),
+            QStringLiteral("connection-lost"), QStringLiteral("handshake-timeout"),
+            QStringLiteral("handshake-refused"), QStringLiteral("invalid-handshake"),
+            QStringLiteral("major-mismatch"), QStringLiteral("line-too-long"),
+            QStringLiteral("invalid-json"), QStringLiteral("missing-id"), QStringLiteral("unknown-id"),
+            QStringLiteral("timeout"), QStringLiteral("rpc-error"), QStringLiteral("invalid-response"),
+            QStringLiteral("disconnected")};
+}
+
 int OptimizerClient::tokenLength(const QByteArray &token)
 {
     return int(QString::fromUtf8(token).toUcs4().size());
diff --git a/energyplugin/etm/scheduler/optimizerclient.h b/energyplugin/etm/scheduler/optimizerclient.h
index 5aed674..3c81ab0 100644
--- a/energyplugin/etm/scheduler/optimizerclient.h
+++ b/energyplugin/etm/scheduler/optimizerclient.h
@@ -165,6 +165,14 @@ public:
      */
     static constexpr int kMinTokenChars = 16;
 
+    /*!
+     * \brief Les codes d'erreur que le client peut retenir (\c lastErrorCode()) ou émettre
+     *   (\c planFailed(), \c protocolError()).
+     * \return Connexion, handshake, ligne écartée, requête. La suite \c etm-powersync-protocolschema
+     *   confronte la liste au code source du client.
+     */
+    static QStringList knownErrorCodes();
+
     /*! \brief Longueur d'un token, comparée à \c kMinTokenChars.
      *  \param token Le token, en UTF-8. \return Son nombre de caractères (points de code). */
     static int tokenLength(const QByteArray &token);
diff --git a/energyplugin/etm/scheduler/optimizerplan.cpp b/energyplugin/etm/scheduler/optimizerplan.cpp
index 06dec95..dab0ea8 100644
--- a/energyplugin/etm/scheduler/optimizerplan.cpp
+++ b/energyplugin/etm/scheduler/optimizerplan.cpp
@@ -103,9 +103,7 @@ QString convertirAction(const QVariant &brut, const QHash<QString, const LoadCon
     }
 
     const QString kind = a.value(QStringLiteral("kind")).toString();
-    if (!estChaine(a.value(QStringLiteral("kind")))
-        || (kind != QLatin1String("setpoint") && kind != QLatin1String("state")
-            && kind != QLatin1String("constraint"))) {
+    if (!estChaine(a.value(QStringLiteral("kind"))) || !OptimizerPlan::kinds().contains(kind)) {
         *detail = QStringLiteral("%1 : kind « %2 » inconnu").arg(id, kind);
         return QStringLiteral("unknown-kind");
     }
@@ -240,6 +238,44 @@ bool differe(const LoadAction &demande, const LoadAction &applique, const QStrin
 
 namespace OptimizerPlan {
 
+QStringList kinds()
+{
+    return {QStringLiteral("setpoint"), QStringLiteral("state"), QStringLiteral("constraint")};
+}
+
+namespace {
+// Les verdicts de valider(), dans l'ORDRE de ses contrôles : c'est l'ordre dans lequel un plan
+// fautif se voit attribuer son code, et celui que rejoue tools/etm-powersync-schema-check.
+struct CodeVerdict { const char *code; Issue issue; };
+constexpr CodeVerdict kVerdicts[] = {
+    {"abstain", Issue::Abstention},       {"malformed-plan", Issue::Invalide},
+    {"empty-plan", Issue::Abstention},    {"bad-time", Issue::Invalide},
+    {"slots-unordered", Issue::Invalide}, {"malformed-action", Issue::Invalide},
+    {"unknown-load", Issue::Invalide},    {"unknown-kind", Issue::Invalide},
+    {"kind-mismatch", Issue::Invalide},   {"kind-not-announced", Issue::Invalide},
+    {"missing-reason", Issue::Invalide},  {"bad-value", Issue::Invalide},
+    {"duplicate-load", Issue::Invalide},  {"expired", Issue::Expire},
+    {"no-current-slot", Issue::Abstention}, {"incomplete-slot", Issue::Invalide},
+};
+}
+
+QStringList verdictCodes(Issue issue)
+{
+    QStringList out;
+    for (const CodeVerdict &v : kVerdicts)
+        if (v.issue == issue)
+            out << QString::fromLatin1(v.code);
+    return out;
+}
+
+QStringList verdictCodes()
+{
+    QStringList out;
+    for (const CodeVerdict &v : kVerdicts)
+        out << QString::fromLatin1(v.code);
+    return out;
+}
+
 QString assainirTexte(const QVariant &v)
 {
     if (!estChaine(v))
diff --git a/energyplugin/etm/scheduler/optimizerplan.h b/energyplugin/etm/scheduler/optimizerplan.h
index d694014..3506480 100644
--- a/energyplugin/etm/scheduler/optimizerplan.h
+++ b/energyplugin/etm/scheduler/optimizerplan.h
@@ -45,6 +45,26 @@ enum class Issue {
     Invalide     //!< Plan refusé en entier, jamais appliqué partiellement — un échec (§7).
 };
 
+/*!
+ * \brief Les \c kind que le validateur RECONNAÎT (§6) — la liste qu'il applique, pas une copie.
+ * \return \c setpoint, \c state, \c constraint. Un kind hors liste est refusé (\c unknown-kind) ;
+ *   \c constraint est reconnu mais toujours refusé (\c kind-mismatch) : aucun mécanisme ne le porte
+ *   (annexe F). Le contrat OpenRPC en régénère son énumération (\c ActionKind).
+ */
+QStringList kinds();
+
+/*!
+ * \brief Les codes de verdict que \c valider() peut rendre, dans l'ordre de ses contrôles.
+ * \param issue Issue dont on veut les codes.
+ * \return Les codes de cette issue (\c Valide : aucun). Ce sont les noms des règles
+ *   \c x-etm-semantic-rules du contrat OpenRPC et des valeurs de \c fallbackCode ; la suite
+ *   \c etm-powersync-protocolschema confronte la liste au code source de \c valider().
+ */
+QStringList verdictCodes(Issue issue);
+
+/*! \brief \return Tous les codes de \c verdictCodes(), dans l'ordre des contrôles de \c valider(). */
+QStringList verdictCodes();
+
 /*! \brief Une action reçue, convertie. */
 struct ActionRecue {
     LoadAction  action;        //!< Action interne : mécanisme, motif filtré, niveau \c optimizer provisoire.
diff --git a/energyplugin/etm/scheduler/socketscheduler.cpp b/energyplugin/etm/scheduler/socketscheduler.cpp
index 093032b..9e6ee1d 100644
--- a/energyplugin/etm/scheduler/socketscheduler.cpp
+++ b/energyplugin/etm/scheduler/socketscheduler.cpp
@@ -11,13 +11,29 @@ namespace {
 // Rang d'un déclencheur : le plus significatif l'emporte quand plusieurs se cumulent.
 int rangDeclencheur(const QString &t)
 {
-    static const QStringList ordre{QStringLiteral("cycle"), QStringLiteral("forecast"),
-                                   QStringLiteral("config"), QStringLiteral("load-change"),
-                                   QStringLiteral("intent")};
-    return ordre.indexOf(t);
+    return SocketScheduler::knownTriggers().indexOf(t);
 }
 }
 
+QStringList SocketScheduler::knownTriggers()
+{
+    return {QStringLiteral("cycle"), QStringLiteral("forecast"), QStringLiteral("config"),
+            QStringLiteral("load-change"), QStringLiteral("intent")};
+}
+
+QStringList SocketScheduler::knownFallbackCodes()
+{
+    using OptimizerPlan::Issue;
+    return QStringList{QStringLiteral("no-plan")} + OptimizerPlan::verdictCodes(Issue::Abstention)
+           + OptimizerPlan::verdictCodes(Issue::Expire) + OptimizerPlan::verdictCodes(Issue::Invalide)
+           + QStringList{QStringLiteral("no-shadow-slot")};
+}
+
+QStringList SocketScheduler::knownLastErrorCodes()
+{
+    return OptimizerClient::knownErrorCodes() + OptimizerPlan::verdictCodes(OptimizerPlan::Issue::Invalide);
+}
+
 SocketScheduler::SocketScheduler(IScheduler *ombre, OptimizerClient *client, FournisseurFil fil,
                                  QObject *parent)
     : QObject(parent)
diff --git a/energyplugin/etm/scheduler/socketscheduler.h b/energyplugin/etm/scheduler/socketscheduler.h
index c1374b7..a72e779 100644
--- a/energyplugin/etm/scheduler/socketscheduler.h
+++ b/energyplugin/etm/scheduler/socketscheduler.h
@@ -92,6 +92,26 @@ public:
      */
     void noterDeclencheur(const QString &trigger);
 
+    /*!
+     * \brief Les valeurs de \c trigger (§5.1), de la moins à la plus significative.
+     * \return \c cycle, \c forecast, \c config, \c load-change, \c intent — l'ordre qu'applique
+     *   \c noterDeclencheur(), et l'énumération \c Trigger du contrat OpenRPC.
+     */
+    static QStringList knownTriggers();
+
+    /*!
+     * \brief Les valeurs de \c fallbackCode publiées par \c NymeaEnergy.GetPlan (INTERFACE.md).
+     * \return \c no-plan, les codes de verdict d'\c OptimizerPlan::valider() (abstention, expiré,
+     *   invalide), \c no-shadow-slot.
+     */
+    static QStringList knownFallbackCodes();
+
+    /*!
+     * \brief Les valeurs de \c lastErrorCode publiées par \c NymeaEnergy.GetOptimizerStatus.
+     * \return \c OptimizerClient::knownErrorCodes() et les codes de plan invalide.
+     */
+    static QStringList knownLastErrorCodes();
+
     /*! \brief \return La cause que portera la prochaine requête. */
     QString declencheurEnAttente() const { return m_declencheur; }