diff --git a/internal/cli/target.go b/internal/cli/target.go
index 6cd3a46..45a2089 100644
--- a/internal/cli/target.go
+++ b/internal/cli/target.go
@@ -10,7 +10,7 @@ import (
 
 func parseHandleRepo(arg string) (string, string, error) {
 	parts := strings.SplitN(arg, "/", 2)
-	if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
+	if len(parts) != 2 || parts[0] == "" || parts[1] == "" || strings.Contains(parts[1], "/") {
 		return "", "", fmt.Errorf("expected handle/repo, got %q", arg)
 	}
 	return parts[0], parts[1], nil
diff --git a/internal/cli/target_test.go b/internal/cli/target_test.go
index 2391dc8..66d6dc6 100644
--- a/internal/cli/target_test.go
+++ b/internal/cli/target_test.go
@@ -12,7 +12,8 @@ func TestParseHandleRepo(t *testing.T) {
 	}{
 		{name: "handle and repo", arg: "aly.codes/tg", wantHandle: "aly.codes", wantRepo: "tg"},
 		{name: "did handle", arg: "did:plc:abc123/tg", wantHandle: "did:plc:abc123", wantRepo: "tg"},
-		{name: "repo containing slash", arg: "aly.codes/a/b", wantHandle: "aly.codes", wantRepo: "a/b"},
+		// Repo names become atproto record keys, which cannot contain "/".
+		{name: "repo containing slash", arg: "aly.codes/a/b", wantErr: true},
 		{name: "no slash", arg: "tg", wantErr: true},
 		{name: "empty handle", arg: "/tg", wantErr: true},
 		{name: "empty repo", arg: "aly.codes/", wantErr: true},