diff --git a/apps/cli/internal/operator/runner.go b/apps/cli/internal/operator/runner.go
index 8b9ceab..97d7487 100644
--- a/apps/cli/internal/operator/runner.go
+++ b/apps/cli/internal/operator/runner.go
@@ -55,6 +55,7 @@ var marketByName = map[string]altv1.Market{
 
 // timeframeByName maps scenario timeframe strings onto the contract enum.
 var timeframeByName = map[string]altv1.Timeframe{
+	"monthly":  altv1.Timeframe_TIMEFRAME_MONTHLY,
 	"daily":    altv1.Timeframe_TIMEFRAME_DAILY,
 	"minute_1": altv1.Timeframe_TIMEFRAME_MINUTE_1,
 	"minute_5": altv1.Timeframe_TIMEFRAME_MINUTE_5,
diff --git a/apps/cli/internal/operator/scenario.go b/apps/cli/internal/operator/scenario.go
index d587a68..fc14c4c 100644
--- a/apps/cli/internal/operator/scenario.go
+++ b/apps/cli/internal/operator/scenario.go
@@ -161,6 +161,7 @@ var validVenues = map[string]bool{
 // validTimeframes is the set of bar timeframe strings a list_bars request may
 // use, mirroring the API's accepted Timeframe values.
 var validTimeframes = map[string]bool{
+	"monthly":  true,
 	"daily":    true,
 	"minute_1": true,
 	"minute_5": true,
diff --git a/apps/cli/internal/operator/scenario_test.go b/apps/cli/internal/operator/scenario_test.go
index 7138a33..8d59f28 100644
--- a/apps/cli/internal/operator/scenario_test.go
+++ b/apps/cli/internal/operator/scenario_test.go
@@ -5,6 +5,8 @@ import (
 	"path/filepath"
 	"strings"
 	"testing"
+
+	altv1 "git.toki-labs.com/toki/alt/packages/contracts/gen/go/alt/v1"
 )
 
 func fixture(t *testing.T, name string) string {
@@ -656,6 +658,45 @@ steps:
 	}
 }
 
+func TestTimeframeVocabularyIncludesMonthlyAndMinuteBaseline(t *testing.T) {
+	cases := []struct {
+		timeframe string
+		proto     altv1.Timeframe
+	}{
+		{"monthly", altv1.Timeframe_TIMEFRAME_MONTHLY},
+		{"daily", altv1.Timeframe_TIMEFRAME_DAILY},
+		{"minute_1", altv1.Timeframe_TIMEFRAME_MINUTE_1},
+		{"minute_5", altv1.Timeframe_TIMEFRAME_MINUTE_5},
+	}
+	for _, c := range cases {
+		t.Run(c.timeframe, func(t *testing.T) {
+			if !validTimeframes[c.timeframe] {
+				t.Fatalf("validTimeframes[%q] = false", c.timeframe)
+			}
+			if got := timeframeByName[c.timeframe]; got != c.proto {
+				t.Fatalf("timeframeByName[%q] = %v, want %v", c.timeframe, got, c.proto)
+			}
+
+			yamlText := fmt.Sprintf(`
+name: valid_%s_timeframe
+steps:
+  - id: step1
+    action: start_backtest
+    request:
+      strategy_id: strat1
+      market: kr
+      timeframe: %s
+      from_unix_ms: 100
+      to_unix_ms: 200
+      symbols: ["005930"]
+`, c.timeframe, c.timeframe)
+			if _, err := ParseScenario([]byte(yamlText)); err != nil {
+				t.Fatalf("ParseScenario(%q) returned error: %v", c.timeframe, err)
+			}
+		})
+	}
+}
+
 func TestValidatePaperTradingScenario(t *testing.T) {
 	yamlText := `
 name: valid_paper