diff --git a/internal/extensionserver/mutate/localreply.go b/internal/extensionserver/mutate/localreply.go
index 1963709f..15d397f4 100644
--- a/internal/extensionserver/mutate/localreply.go
+++ b/internal/extensionserver/mutate/localreply.go
@@ -163,6 +163,8 @@ func buildLocalReplyConfig(cfg *LocalReplyConfig) *hcmv3.LocalReplyConfig {
 // re-trigger the exact listener rejection this escaper exists to prevent
 // (issue #243). Keep entries longest-first so matching is unambiguous.
 var envoyBodyAllowedCommands = []string{
+	"%START_TIME(%Y-%m-%d %H:%M:%S UTC)%",
+	"%RESPONSE_CODE_DETAILS%",
 	"%RESPONSE_CODE%",
 }
 
diff --git a/internal/extensionserver/mutate/localreply_test.go b/internal/extensionserver/mutate/localreply_test.go
index a7bd2d5e..0bcaaca8 100644
--- a/internal/extensionserver/mutate/localreply_test.go
+++ b/internal/extensionserver/mutate/localreply_test.go
@@ -233,6 +233,8 @@ func TestEscapeEnvoyFormatLiterals(t *testing.T) {
 		{"bare percent in css", "height: 100%;", "height: 100%%;"},
 		{"multiple bare percents", "120% 50% 0%", "120%% 50%% 0%%"},
 		{"preserve allowlisted command", "code %RESPONSE_CODE% end", "code %RESPONSE_CODE% end"},
+		{"preserve allowlisted response code details", "details: %RESPONSE_CODE_DETAILS%", "details: %RESPONSE_CODE_DETAILS%"},
+		{"preserve allowlisted start time", "at %START_TIME(%Y-%m-%d %H:%M:%S UTC)%", "at %START_TIME(%Y-%m-%d %H:%M:%S UTC)%"},
 		{"escape non-allowlisted command", "%REQ(x-header)%", "%%REQ(x-header)%%"},
 		{"escape non-allowlisted command with length", "%REQ(x-header):10%", "%%REQ(x-header):10%%"},
 		{"escape command-shaped literal", "progress %COMPLETE% now", "progress %%COMPLETE%% now"},