diff --git a/docs/cli.md b/docs/cli.md
index fc43a1d..9b95ab6 100644
--- a/docs/cli.md
+++ b/docs/cli.md
@@ -245,7 +245,7 @@ Both commands require one ID operand and accept `--config`, `--overlay`, and
 `--format text|yaml` (default `text`). Prompt inspection also accepts singleton
 `--version`, defaulting to the empty string. PromptKit owns version selection:
 an omitted version works for a single-version ID, while an ambiguous ID is an
-operational error. These commands do not accept `--scope`; their namespace is
+operational error. These commands have no built-in `--scope` selection; their namespace is
 `promptkit`.
 
 Prompt YAML has these fields. Input order is preserved and an empty input list is
diff --git a/docs/roadmap/remediation.md b/docs/roadmap/remediation.md
index a25a2a3..8e019c8 100644
--- a/docs/roadmap/remediation.md
+++ b/docs/roadmap/remediation.md
@@ -69,6 +69,9 @@ architecture. The issues below affect behavior within the implemented structure.
 - R-08 complete: unknown scopes and absent default app scopes report available
   choices in standard scope order without runtime acquisition.
 
+- R-09 complete: PromptKit selector collisions are checked against installed
+  standard flags; profile-only `version` and custom `scope` selectors are usable.
+
 ## Findings and priority
 
 P1 means a supported invocation is blocked or its report content is corrupted.
diff --git a/promptkit.go b/promptkit.go
index 48fd5b9..2efadca 100644
--- a/promptkit.go
+++ b/promptkit.go
@@ -128,6 +128,10 @@ func RegisterPromptKit[C any](app *App, suite PromptKitSuite[C]) error {
 func normalizePromptKitSuite[C any](suite PromptKitSuite[C]) (PromptKitSuite[C], error) {
 	normalized := suite
 	normalized.Selectors = append([]Selector[C](nil), suite.Selectors...)
+	standardNames := map[string]bool{"help": true}
+	for _, flag := range promptKitInputFlags(PromptKitSuite[C]{}, suite.InspectPrompt != nil) {
+		standardNames[flag.binding.meta.Name] = true
+	}
 	seenNames := make(map[string]struct{}, len(normalized.Selectors))
 	seenShorts := make(map[string]struct{}, len(normalized.Selectors))
 	for i, selector := range normalized.Selectors {
@@ -139,8 +143,7 @@ func normalizePromptKitSuite[C any](suite PromptKitSuite[C]) (PromptKitSuite[C],
 		if !validFlagName(meta.Name) {
 			return PromptKitSuite[C]{}, fmt.Errorf("PromptKit selector flag name %q is invalid", meta.Name)
 		}
-		switch meta.Name {
-		case "config", "overlay", "scope", "format", "version", "help":
+		if standardNames[meta.Name] {
 			return PromptKitSuite[C]{}, fmt.Errorf("PromptKit selector flag --%s conflicts with a standard flag", meta.Name)
 		}
 		if meta.Short == "h" {
diff --git a/promptkit_test.go b/promptkit_test.go
index 5c8e3b0..29dc497 100644
--- a/promptkit_test.go
+++ b/promptkit_test.go
@@ -404,3 +404,47 @@ func sortedKeys(values map[string]any) []string {
 	}
 	return keys
 }
+
+func TestPromptKitSelectorNamesCollideOnlyWithInstalledFlags(t *testing.T) {
+	for _, name := range []string{"version", "scope"} {
+		var captured commandkit.Supplied[string]
+		suite := commandkit.PromptKitSuite[commandkit.Supplied[string]]{
+			Selectors: []commandkit.Selector[commandkit.Supplied[string]]{{Binding: commandkit.ValueFlag[commandkit.Supplied[string]](commandkit.FlagMeta{Name: name}, nil, func(s string) (string, error) { return s, nil }, func(c *commandkit.Supplied[string], v commandkit.Supplied[string]) { *c = v })}},
+			InspectProfile: func(_ context.Context, _ commandkit.Selection, c commandkit.Supplied[string], _ string) (commandkit.Acquired[*promptkit.ProfileInspection], error) {
+				captured = c
+				return commandkit.Acquired[*promptkit.ProfileInspection]{Value: &promptkit.ProfileInspection{}}, nil
+			},
+		}
+		app, _ := commandkit.New(commandkit.Identity{Name: "example"})
+		if err := commandkit.RegisterPromptKit(app, suite); err != nil {
+			t.Fatalf("%s: %v", name, err)
+		}
+		result := app.Execute(context.Background(), []string{"promptkit", "show", "profile", "example", "--" + name, "selected"}, commandkit.Streams{})
+		if result.Kind != commandkit.OutcomeSuccess || captured != (commandkit.Supplied[string]{Value: "selected", Set: true}) {
+			t.Fatalf("%s: result=%#v captured=%#v", name, result, captured)
+		}
+		suite.InspectPrompt = func(context.Context, commandkit.Selection, commandkit.Supplied[string], string, string) (commandkit.Acquired[*promptkit.PromptInspection], error) {
+			return commandkit.Acquired[*promptkit.PromptInspection]{Value: &promptkit.PromptInspection{}}, nil
+		}
+		other, _ := commandkit.New(commandkit.Identity{Name: "example"})
+		err := commandkit.RegisterPromptKit(other, suite)
+		if name == "version" && err == nil {
+			t.Fatal("accepted collision with installed prompt version flag")
+		}
+		if name == "scope" && err != nil {
+			t.Fatalf("scope selector conflicts with no installed flag: %v", err)
+		}
+	}
+	for _, name := range []string{"config", "overlay", "format", "help"} {
+		app, _ := commandkit.New(commandkit.Identity{Name: "example"})
+		suite := commandkit.PromptKitSuite[struct{}]{
+			InspectProfile: func(context.Context, commandkit.Selection, struct{}, string) (commandkit.Acquired[*promptkit.ProfileInspection], error) {
+				return commandkit.Acquired[*promptkit.ProfileInspection]{}, nil
+			},
+			Selectors: []commandkit.Selector[struct{}]{{Binding: commandkit.ValueFlag[struct{}](commandkit.FlagMeta{Name: name}, nil, func(s string) (string, error) { return s, nil }, func(*struct{}, commandkit.Supplied[string]) {})}},
+		}
+		if err := commandkit.RegisterPromptKit(app, suite); err == nil {
+			t.Fatalf("accepted standard flag collision --%s", name)
+		}
+	}
+}