diff --git a/internal/lexicon/lexicon.go b/internal/lexicon/lexicon.go
index b7824d9..ab06327 100644
--- a/internal/lexicon/lexicon.go
+++ b/internal/lexicon/lexicon.go
@@ -64,6 +64,7 @@ func mustLoad() lexiconFile {
 		"interrogatives", "capture_verbs", "narrative_requests", "cardinals", "ordinals",
 		"day_offsets", "weekdays", "months_genitive", "hours_spoken",
 		"not_place_after_v", "parts_of_day", "reminder_verbs", "half_hour",
+		"filler_particles",
 	} {
 		s, ok := f.Sets[name]
 		if !ok || (len(s.Words) == 0 && len(s.Values) == 0) {
@@ -112,6 +113,19 @@ func PartsOfDay() []string { return words("parts_of_day") }
 // ReminderVerbs returns the imperatives that open a reminder.
 func ReminderVerbs() []string { return words("reminder_verbs") }
 
+// IsFillerParticle reports whether a word can never be the subject of a
+// request: a particle, a politeness word, or the first-person object. See the
+// set's own note for why this is not a stopword list.
+func IsFillerParticle(word string) bool {
+	w := norm(word)
+	for _, p := range ru.Sets["filler_particles"].Words {
+		if w == p {
+			return true
+		}
+	}
+	return false
+}
+
 // HalfHourWords returns those forms, for a caller folding every time word into
 // one set rather than asking about one word.
 func HalfHourWords() []string { return words("half_hour") }
diff --git a/internal/lexicon/lexicon_ru_v1.json b/internal/lexicon/lexicon_ru_v1.json
index 134a083..b3ee915 100644
--- a/internal/lexicon/lexicon_ru_v1.json
+++ b/internal/lexicon/lexicon_ru_v1.json
@@ -173,6 +173,14 @@
         "половина", "половине", "половину", "половины", "пол",
         "half"
       ]
+    },
+    "filler_particles": {
+      "note": "Words that carry no subject of their own: particles, the politeness words, and the first-person object he addresses her with. A caller asking \"did he say WHAT to remind him about\" has to discount these, or \"ну напомни же\" and \"напомни мне пожалуйста\" both read as a reminder whose subject is the particle. Closed in the sense that matters: these are function words, and the language is not adding any. Not a stopword list — a stopword list is a scoring convenience and may be as long as it likes, while every word here has to be one that cannot BE a reminder's subject.",
+      "words": [
+        "ну", "же", "уж", "там", "вот", "пожалуйста", "плиз", "ка",
+        "давай", "давай-ка", "а", "и", "бы", "мне", "меня", "мной",
+        "please", "just", "hey", "me"
+      ]
     }
   }
 }
diff --git a/internal/router/eval/ru_routing_v1.json b/internal/router/eval/ru_routing_v1.json
index c66ed89..5fbef0b 100644
--- a/internal/router/eval/ru_routing_v1.json
+++ b/internal/router/eval/ru_routing_v1.json
@@ -102,6 +102,8 @@
     { "id": "amb-003", "utterance": "ну это", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "filler"] },
     { "id": "amb-004", "utterance": "сделай это", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "anaphora"], "note": "unresolved anaphora with an imperative — must not guess an fn" },
     { "id": "amb-005", "utterance": "потом", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "filler"] },
-    { "id": "amb-006", "utterance": "the thing from earlier", "lang": "en", "want_clarify": true, "tags": ["ambiguous", "anaphora"] }
+    { "id": "amb-006", "utterance": "the thing from earlier", "lang": "en", "want_clarify": true, "tags": ["ambiguous", "anaphora"] },
+    { "id": "amb-007", "utterance": "напомни", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "reminder"], "note": "the reminder verb and nothing else — she knows the shape of the request and not one thing about it. Answered 'не получилось разобрать время напоминания' on the box until V-548: the subjectless-reminder gate tested Slots.Text == \"\", and fillSlots had put the verb in that slot" },
+    { "id": "amb-008", "utterance": "ну напомни же", "lang": "ru", "want_clarify": true, "tags": ["ambiguous", "reminder", "filler"], "note": "the same request wrapped in particles, which is why filler_particles is a lexicon set — without it the particles read as the subject" }
   ]
 }
diff --git a/internal/router/remindersubject.go b/internal/router/remindersubject.go
new file mode 100644
index 0000000..701cd65
--- /dev/null
+++ b/internal/router/remindersubject.go
@@ -0,0 +1,62 @@
+package router
+
+import (
+	"strings"
+
+	"github.com/kami/maven/internal/lexicon"
+	"github.com/kami/maven/internal/morph"
+)
+
+// A reminder needs something to say at the hour, and the gate that checks for
+// one was reading a slot that is never empty.
+//
+// gateLLMDecision has asked about a subjectless reminder since V-383, on the
+// test `d.Slots.Text == ""`. Measured on the box on 05-08-2026: "напомни" alone
+// routes to IntentReminder with `Text:напомни`, because fillSlots hands the text
+// slot the utterance when the model names nothing narrower. So the slot was
+// never empty, the gate never fired, and the turn reached actionReminder and
+// answered "не получилось разобрать время напоминания." — a parse error for a
+// request she never finished asking about. "ну напомни же" did the same.
+//
+// The fix is to ask what the text slot CONTAINS rather than whether it is set.
+// Two closed classes answer that and no third mechanism is needed: the reminder
+// verbs are her own vocabulary (lexicon.ReminderVerbs), and the particles and
+// politeness words cannot be the subject of anything (lexicon.IsFillerParticle).
+// A verb is matched by lemma through morph.SameWord, so "напоминай" and
+// "напомнить" need no entry of their own.
+//
+// Deliberately NOT reusing cmd/mavend/reminderbody.go, which strips the same
+// marker: that function also strips the time words, so "напомни завтра" would
+// read as subjectless there. Asking is right when he named no subject, and wrong
+// when he named a day — the reminder for tomorrow is the one whose subject she
+// should ask about, not one she should treat as noise.
+
+// reminderHasSubject reports whether a reminder's text names anything to say at
+// the hour. False for "напомни", "напомни мне", "ну напомни же"; true for
+// "напомни позвонить маме" and for "напомни завтра", where the day is a subject
+// she can ask nothing better about.
+func reminderHasSubject(text string) bool {
+	for _, f := range strings.Fields(strings.ToLower(text)) {
+		w := strings.Trim(f, " ,.;:!?—-«»\"'()")
+		if w == "" || lexicon.IsFillerParticle(w) {
+			continue
+		}
+		if isReminderVerb(w) {
+			continue
+		}
+		return true
+	}
+	return false
+}
+
+// isReminderVerb matches one of her reminder imperatives by lemma. Lemma and not
+// prefix: "напоминание" is a noun he can perfectly well ask to be reminded
+// about, and a stem test would eat it.
+func isReminderVerb(word string) bool {
+	for _, v := range lexicon.ReminderVerbs() {
+		if word == v || morph.SameWord(word, v) {
+			return true
+		}
+	}
+	return false
+}
diff --git a/internal/router/remindersubject_test.go b/internal/router/remindersubject_test.go
new file mode 100644
index 0000000..80b0565
--- /dev/null
+++ b/internal/router/remindersubject_test.go
@@ -0,0 +1,40 @@
+package router
+
+import "testing"
+
+func TestReminderHasSubject(t *testing.T) {
+	cases := []struct {
+		text string
+		want bool
+	}{
+		// The three the box produced, and the reason this file exists.
+		{"напомни", false},
+		{"ну напомни же", false},
+		{"напомни мне", false},
+		{"напомни мне пожалуйста", false},
+		// Lemma, not literal: none of these forms is the one in the utterance
+		// the lexicon lists first.
+		{"напоминай", false},
+		{"напомнить", false},
+		{"remind me", false},
+		{"remind me please", false},
+		// A real subject, however short.
+		{"напомни позвонить маме", true},
+		{"напомни про таблетки", true},
+		{"напомни выпить воды", true},
+		{"remind me to call mom", true},
+		// A day is a subject she can ask nothing better about, so she does not
+		// ask. This is where reminderBody's stripping would disagree, on purpose.
+		{"напомни завтра", true},
+		{"напомни в семь", true},
+		// A noun that starts like the verb. A stem test would eat it.
+		{"напомни про напоминание", true},
+		// Empty is subjectless without asking the lexicon anything.
+		{"", false},
+	}
+	for _, c := range cases {
+		if got := reminderHasSubject(c.text); got != c.want {
+			t.Errorf("reminderHasSubject(%q) = %v, want %v", c.text, got, c.want)
+		}
+	}
+}
diff --git a/internal/router/router.go b/internal/router/router.go
index c30738e..68457e3 100644
--- a/internal/router/router.go
+++ b/internal/router/router.go
@@ -189,7 +189,12 @@ func (r *Router) gateLLMDecision(d *Decision) {
 	// A reminder with no subject: she knows when but not what to say then.
 	// Setting it anyway fires an empty reminder at the hour, which reads as a
 	// bug to him and cannot be repaired after the fact. Ask (Vikunja #383).
-	if d.Intent == IntentReminder && d.Slots.Text == "" && d.Confidence > llmThinConfidence {
+	//
+	// The test is what the text slot CONTAINS, not whether it is set. It was the
+	// latter until 05-08-2026, and the slot is never empty: fillSlots hands it
+	// the utterance, so "напомни" arrived here with Text:напомни and the gate
+	// never fired (V-457). See remindersubject.go.
+	if d.Intent == IntentReminder && !reminderHasSubject(d.Slots.Text) && d.Confidence > llmThinConfidence {
 		d.Confidence = llmThinConfidence
 	}
 	if d.Confidence < r.threshold {