Extend composed consumer with request validation

integrations/ckprompt/examples/composed/main.go

@@ -141,6 +141,31 @@ func selectedCampaign(configuration appConfiguration, supplied commandkit.Suppli
 	return name, chosen, nil
 }
 
+func buildValidationRequest(ctx context.Context, seed ckprompt.ValidationRequest, input *inspectionInput, cache *runCache) (promptkit.RunRequest, error) {
+	application, err := loadApplicationConfig(ctx, seed.Selection, input, cache)
+	if err != nil {
+		return promptkit.RunRequest{}, err
+	}
+	name, _, err := selectedCampaign(application.Config, input.Campaign)
+	if err != nil {
+		return promptkit.RunRequest{}, err
+	}
+
+	request := seed.Request
+	vars := make(map[string]string, len(request.Vars)+2)
+	for key, value := range request.Vars {
+		vars[key] = value
+	}
+	if _, supplied := vars["topic"]; !supplied {
+		vars["topic"] = name + " campaign planning"
+	}
+	if _, supplied := vars["mode"]; !supplied {
+		vars["mode"] = ""
+	}
+	request.Vars = vars
+	return request, nil
+}
+
 func newApp() (*commandkit.App, error) {
 	limitDefault := 0
 	limitFlag := commandkit.ValueFlag(commandkit.FlagMeta{Name: "limit", Usage: "Override the application item limit."}, &limitDefault, strconv.Atoi,
@@ -170,6 +195,7 @@ func newApp() (*commandkit.App, error) {
 	definitions.NewInput = inputFactory
 	definitions.NewState = stateFactory
 	definitions.Selectors = []commandkit.Flag[*inspectionInput]{campaignSelector()}
+	definitions = ckprompt.WithRequestValidation(definitions, loadPromptEngine, buildValidationRequest)
 	definitionCommand := ckprompt.Command(definitions)
 
 	store := map[string]session{