diff --git a/scripts/docs-i18n/doc_chunked_raw.go b/scripts/docs-i18n/doc_chunked_raw.go
index 58175ecc2294..be1deb14ee50 100644
--- a/scripts/docs-i18n/doc_chunked_raw.go
+++ b/scripts/docs-i18n/doc_chunked_raw.go
@@ -78,6 +78,9 @@ func validateDocBodyFencedLiterals(source, translated string) error {
 	}
 	sourceStructure := summarizeDocChunkStructure(source)
 	translatedStructure := summarizeDocChunkStructure(translated)
+	if !sameI18NProtocolMarkers(source, translated) {
+		return fmt.Errorf("i18n placeholder mismatch")
+	}
 	if !slices.Equal(sourceStructure.listShapes, translatedStructure.listShapes) {
 		return fmt.Errorf("list structure mismatch: source=%v translated=%v", sourceStructure.listShapes, translatedStructure.listShapes)
 	}
@@ -236,6 +239,12 @@ func validateDocChunkTranslation(source, translated string) error {
 	sourceLower := strings.ToLower(source)
 	translatedLower := strings.ToLower(translated)
 	for _, token := range docsProtocolTokens {
+		if token == "__OC_I18N_" {
+			if !sameI18NProtocolMarkers(source, translated) {
+				return fmt.Errorf("protocol token leaked: %s", token)
+			}
+			continue
+		}
 		tokenLower := strings.ToLower(token)
 		if strings.Contains(sourceLower, tokenLower) {
 			continue
@@ -278,6 +287,16 @@ func validateDocChunkTranslation(source, translated string) error {
 	return nil
 }
 
+func sameI18NProtocolMarkers(source, translated string) bool {
+	if !sameStringMultiset(placeholderRe.FindAllString(source, -1), placeholderRe.FindAllString(translated, -1)) {
+		return false
+	}
+	sourceResidual := placeholderRe.ReplaceAllString(source, "")
+	translatedResidual := placeholderRe.ReplaceAllString(translated, "")
+	return strings.Count(strings.ToLower(sourceResidual), "__oc_i18n_") ==
+		strings.Count(strings.ToLower(translatedResidual), "__oc_i18n_")
+}
+
 func sameStringMultiset(left, right []string) bool {
 	if len(left) != len(right) {
 		return false
diff --git a/scripts/docs-i18n/doc_mode_test.go b/scripts/docs-i18n/doc_mode_test.go
index e3c3ea80ed1c..89c2c661cf4b 100644
--- a/scripts/docs-i18n/doc_mode_test.go
+++ b/scripts/docs-i18n/doc_mode_test.go
@@ -546,6 +546,44 @@ func TestValidateDocChunkTranslationRejectsInventedI18NPlaceholder(t *testing.T)
 	}
 }
 
+func TestValidateDocChunkTranslationRejectsAdditionalI18NPlaceholder(t *testing.T) {
+	t.Parallel()
+
+	source := "```text\n__OC_I18N_900000__\n```\n"
+	translated := "```text\n__OC_I18N_900000__\n```\n__OC_I18N_900014__\n"
+
+	err := validateDocChunkTranslation(source, translated)
+	if err == nil {
+		t.Fatal("expected additional i18n placeholder to be rejected")
+	}
+	if !strings.Contains(err.Error(), "protocol token leaked: __OC_I18N_") {
+		t.Fatalf("expected i18n placeholder leakage error, got %v", err)
+	}
+}
+
+func TestValidateDocChunkTranslationRejectsMalformedI18NPlaceholder(t *testing.T) {
+	t.Parallel()
+
+	for _, leaked := range []string{"__oc_i18n_900014__", "__OC_I18N_invalid__"} {
+		err := validateDocChunkTranslation("Regular paragraph.\n", "Обычный абзац.\n"+leaked+"\n")
+		if err == nil {
+			t.Fatalf("expected malformed i18n placeholder %q to be rejected", leaked)
+		}
+	}
+}
+
+func TestValidateDocBodyFencedLiteralsRejectsRestoredPlaceholderLeak(t *testing.T) {
+	t.Parallel()
+
+	source := "Before.\n\n```ts\nconst value = \"<user-id>\";\n```\n\nAfter.\n"
+	translated := "До.\n\n__OC_I18N_900014__\n\nПосле.\n"
+
+	err := validateDocBodyFencedLiterals(source, translated)
+	if err == nil {
+		t.Fatal("expected restored placeholder leak to be rejected")
+	}
+}
+
 func TestValidateDocChunkTranslationRejectsHeadingLoss(t *testing.T) {
 	t.Parallel()
 
@@ -2142,7 +2180,7 @@ func TestProcessFileDocUsesFieldLevelFrontmatterTranslation(t *testing.T) {
 	if !strings.Contains(text, "在 Fly.io 上部署 OpenClaw") {
 		t.Fatalf("expected translated read_when entry in output:\n%s", text)
 	}
-	if !strings.Contains(text, "prompt_version: 16") {
+	if !strings.Contains(text, "prompt_version: 17") {
 		t.Fatalf("expected prompt version 15 in output metadata:\n%s", text)
 	}
 }
diff --git a/scripts/docs-i18n/util.go b/scripts/docs-i18n/util.go
index 6b93f67914d4..4f9fd97b6eb8 100644
--- a/scripts/docs-i18n/util.go
+++ b/scripts/docs-i18n/util.go
@@ -12,7 +12,7 @@ import (
 
 const (
 	workflowVersion          = 16
-	promptVersion            = 16
+	promptVersion            = 17
 	docsI18nEngineName       = "codex"
 	envDocsI18nProvider      = "OPENCLAW_DOCS_I18N_PROVIDER"
 	envDocsI18nModel         = "OPENCLAW_DOCS_I18N_MODEL"
diff --git a/scripts/docs-i18n/util_test.go b/scripts/docs-i18n/util_test.go
index cc147f62d277..057355453986 100644
--- a/scripts/docs-i18n/util_test.go
+++ b/scripts/docs-i18n/util_test.go
@@ -8,7 +8,7 @@ import (
 func TestCacheNamespaceIncludesPromptVersion(t *testing.T) {
 	t.Parallel()
 
-	if want := "prompt=16"; !strings.Contains(cacheNamespace(), want) {
+	if want := "prompt=17"; !strings.Contains(cacheNamespace(), want) {
 		t.Fatalf("expected cache namespace to contain %q, got %q", want, cacheNamespace())
 	}
 }