diff --git a/cmd/flux/create_helmrelease_test.go b/cmd/flux/create_helmrelease_test.go
index d5d76d36..ffdef081 100644
--- a/cmd/flux/create_helmrelease_test.go
+++ b/cmd/flux/create_helmrelease_test.go
@@ -45,7 +45,7 @@ func TestCreateHelmRelease(t *testing.T) {
 		{
 			name:   "unknown source kind",
 			args:   "create helmrelease podinfo --source foobar/podinfo --chart podinfo --export",
-			assert: assertError(`invalid argument "foobar/podinfo" for "--source" flag: source kind 'foobar' is not supported, must be one of: HelmRepository|GitRepository|Bucket`),
+			assert: assertError(`invalid argument "foobar/podinfo" for "--source" flag: source kind 'foobar' is not supported, must be one of: HelmRepository, GitRepository, Bucket`),
 		},
 		{
 			name:   "unknown chart reference kind",
diff --git a/cmd/flux/create_source_chart_test.go b/cmd/flux/create_source_chart_test.go
index 87d0e3fd..95667086 100644
--- a/cmd/flux/create_source_chart_test.go
+++ b/cmd/flux/create_source_chart_test.go
@@ -50,7 +50,7 @@ func TestCreateSourceChart(t *testing.T) {
 		{
 			name:   "unknown source kind",
 			args:   "create source chart podinfo --source foobar/podinfo --export",
-			assert: assertError(`invalid argument "foobar/podinfo" for "--source" flag: source kind 'foobar' is not supported, must be one of: HelmRepository|GitRepository|Bucket`),
+			assert: assertError(`invalid argument "foobar/podinfo" for "--source" flag: source kind 'foobar' is not supported, must be one of: HelmRepository, GitRepository, Bucket`),
 		},
 		{
 			name:   "basic chart",
diff --git a/cmd/flux/create_source_git_test.go b/cmd/flux/create_source_git_test.go
index a652429c..f8ebb167 100644
--- a/cmd/flux/create_source_git_test.go
+++ b/cmd/flux/create_source_git_test.go
@@ -147,12 +147,12 @@ func TestCreateSourceGitExport(t *testing.T) {
 		{
 			name:   "source with invalid provider",
 			args:   "create source git podinfo --namespace=flux-system --url=https://dev.azure.com/foo/bar/_git/podinfo --provider dummy --branch=test --interval=1m0s --export",
-			assert: assertError("invalid argument \"dummy\" for \"--provider\" flag: source Git provider 'dummy' is not supported, must be one of: generic|azure"),
+			assert: assertError("invalid argument \"dummy\" for \"--provider\" flag: source Git provider 'dummy' is not supported, must be one of: generic, azure"),
 		},
 		{
 			name:   "source with empty provider",
 			args:   "create source git podinfo --namespace=flux-system --url=https://dev.azure.com/foo/bar/_git/podinfo --provider \"\" --branch=test --interval=1m0s --export",
-			assert: assertError("invalid argument \"\" for \"--provider\" flag: no source Git provider given, must be one of: generic|azure"),
+			assert: assertError("invalid argument \"\" for \"--provider\" flag: no source Git provider given, please specify the Git provider name"),
 		},
 		{
 			name:   "source with no provider",
diff --git a/internal/flags/crds.go b/internal/flags/crds.go
index 22f1c877..3eeba92b 100644
--- a/internal/flags/crds.go
+++ b/internal/flags/crds.go
@@ -40,11 +40,11 @@ func (a *CRDsPolicy) String() string {
 func (a *CRDsPolicy) Set(str string) error {
 	if strings.TrimSpace(str) == "" {
 		return fmt.Errorf("no upgrade CRDs policy given, must be one of: %s",
-			a.Type())
+			strings.Join(supportedCRDsPolicies, ", "))
 	}
 	if !utils.ContainsItemString(supportedCRDsPolicies, str) {
 		return fmt.Errorf("unsupported upgrade CRDs policy '%s', must be one of: %s",
-			str, a.Type())
+			str, strings.Join(supportedCRDsPolicies, ", "))
 
 	}
 	*a = CRDsPolicy(str)
diff --git a/internal/flags/decryption_provider.go b/internal/flags/decryption_provider.go
index c92c2d46..ad4a90bc 100644
--- a/internal/flags/decryption_provider.go
+++ b/internal/flags/decryption_provider.go
@@ -34,12 +34,11 @@ func (d *DecryptionProvider) String() string {
 func (d *DecryptionProvider) Set(str string) error {
 	if strings.TrimSpace(str) == "" {
 		return fmt.Errorf("no decryption provider given, must be one of: %s",
-			d.Type())
+			strings.Join(supportedDecryptionProviders, ", "))
 	}
 	if !utils.ContainsItemString(supportedDecryptionProviders, str) {
 		return fmt.Errorf("unsupported decryption provider '%s', must be one of: %s",
-			str, d.Type())
-
+			str, strings.Join(supportedDecryptionProviders, ", "))
 	}
 	*d = DecryptionProvider(str)
 	return nil
diff --git a/internal/flags/ecdsa_curve.go b/internal/flags/ecdsa_curve.go
index f38e53f2..fba3c149 100644
--- a/internal/flags/ecdsa_curve.go
+++ b/internal/flags/ecdsa_curve.go
@@ -45,7 +45,7 @@ func (c *ECDSACurve) Set(str string) error {
 		*c = ECDSACurve{v}
 		return nil
 	}
-	return fmt.Errorf("unsupported curve '%s', must be one of: %s", str, c.Type())
+	return fmt.Errorf("unsupported curve '%s', must be one of: %s", str, strings.Join(ecdsaCurves(), ", "))
 }
 
 func (c *ECDSACurve) Type() string {
diff --git a/internal/flags/gitlab_visibility.go b/internal/flags/gitlab_visibility.go
index e2b52698..e729cb3d 100644
--- a/internal/flags/gitlab_visibility.go
+++ b/internal/flags/gitlab_visibility.go
@@ -52,7 +52,8 @@ func (d *GitLabVisibility) Set(str string) error {
 	}
 	var visibility = gitprovider.RepositoryVisibility(str)
 	if ValidateRepositoryVisibility(visibility) != nil {
-		return fmt.Errorf("unsupported visibility '%s', must be one of: %s", str, d.Type())
+		return fmt.Errorf("unsupported visibility '%s', must be one of: %s",
+			str, strings.Join(gitLabVisibilities(), ", "))
 	}
 	*d = GitLabVisibility(visibility)
 	return nil
diff --git a/internal/flags/helm_chart_source.go b/internal/flags/helm_chart_source.go
index 30f2e379..2b321886 100644
--- a/internal/flags/helm_chart_source.go
+++ b/internal/flags/helm_chart_source.go
@@ -53,7 +53,7 @@ func (s *HelmChartSource) Set(str string) error {
 	cleanSourceKind, ok := utils.ContainsEqualFoldItemString(supportedHelmChartSourceKinds, sourceKind)
 	if !ok {
 		return fmt.Errorf("source kind '%s' is not supported, must be one of: %s",
-			sourceKind, s.Type())
+			sourceKind, strings.Join(supportedHelmChartSourceKinds, ", "))
 	}
 
 	s.Kind = cleanSourceKind
diff --git a/internal/flags/kustomization_source.go b/internal/flags/kustomization_source.go
index cb65c64d..24ddbc2a 100644
--- a/internal/flags/kustomization_source.go
+++ b/internal/flags/kustomization_source.go
@@ -60,7 +60,7 @@ func (s *KustomizationSource) Set(str string) error {
 	cleanSourceKind, ok := utils.ContainsEqualFoldItemString(supportedKustomizationSourceKinds, sourceKind)
 	if !ok {
 		return fmt.Errorf("source kind '%s' is not supported, must be one of: %s",
-			sourceKind, s.Type())
+			sourceKind, strings.Join(supportedKustomizationSourceKinds, ", "))
 	}
 
 	s.Kind = cleanSourceKind
diff --git a/internal/flags/local_helm_chart_source.go b/internal/flags/local_helm_chart_source.go
index a47221dd..ac28bb5e 100644
--- a/internal/flags/local_helm_chart_source.go
+++ b/internal/flags/local_helm_chart_source.go
@@ -48,7 +48,7 @@ func (s *LocalHelmChartSource) Set(str string) error {
 	cleanSourceKind, ok := utils.ContainsEqualFoldItemString(supportedHelmChartSourceKinds, sourceKind)
 	if !ok {
 		return fmt.Errorf("source kind '%s' is not supported, must be one of: %s",
-			sourceKind, s.Type())
+			sourceKind, strings.Join(supportedHelmChartSourceKinds, ", "))
 	}
 
 	s.Kind = cleanSourceKind
diff --git a/internal/flags/log_level.go b/internal/flags/log_level.go
index 6464e196..6fb1c2c5 100644
--- a/internal/flags/log_level.go
+++ b/internal/flags/log_level.go
@@ -34,11 +34,11 @@ func (l *LogLevel) String() string {
 func (l *LogLevel) Set(str string) error {
 	if strings.TrimSpace(str) == "" {
 		return fmt.Errorf("no log level given, must be one of: %s",
-			l.Type())
+			strings.Join(supportedLogLevels, ", "))
 	}
 	if !utils.ContainsItemString(supportedLogLevels, str) {
 		return fmt.Errorf("unsupported log level '%s', must be one of: %s",
-			str, l.Type())
+			str, strings.Join(supportedLogLevels, ", "))
 
 	}
 	*l = LogLevel(str)
diff --git a/internal/flags/public_key_algorithm.go b/internal/flags/public_key_algorithm.go
index 1bdb7023..d2bda1c8 100644
--- a/internal/flags/public_key_algorithm.go
+++ b/internal/flags/public_key_algorithm.go
@@ -32,7 +32,7 @@ func (a *PublicKeyAlgorithm) String() string {
 func (a *PublicKeyAlgorithm) Set(str string) error {
 	if strings.TrimSpace(str) == "" {
 		return fmt.Errorf("no public key algorithm given, must be one of: %s",
-			a.Type())
+			strings.Join(supportedPublicKeyAlgorithms, ", "))
 	}
 	for _, v := range supportedPublicKeyAlgorithms {
 		if str == v {
@@ -41,7 +41,7 @@ func (a *PublicKeyAlgorithm) Set(str string) error {
 		}
 	}
 	return fmt.Errorf("unsupported public key algorithm '%s', must be one of: %s",
-		str, a.Type())
+		str, strings.Join(supportedPublicKeyAlgorithms, ", "))
 }
 
 func (a *PublicKeyAlgorithm) Type() string {
diff --git a/internal/flags/source_bucket_provider.go b/internal/flags/source_bucket_provider.go
index e83c3835..7b1c4fe5 100644
--- a/internal/flags/source_bucket_provider.go
+++ b/internal/flags/source_bucket_provider.go
@@ -45,7 +45,7 @@ func (p *SourceBucketProvider) Set(str string) error {
 	}
 	if !utils.ContainsItemString(supportedSourceBucketProviders, str) {
 		return fmt.Errorf("source bucket provider '%s' is not supported, must be one of: %v",
-			str, p.Type())
+			str, strings.Join(supportedSourceBucketProviders, ", "))
 	}
 	*p = SourceBucketProvider(str)
 	return nil
diff --git a/internal/flags/source_git_provider.go b/internal/flags/source_git_provider.go
index 144b7865..9de1ce93 100644
--- a/internal/flags/source_git_provider.go
+++ b/internal/flags/source_git_provider.go
@@ -37,12 +37,12 @@ func (p *SourceGitProvider) String() string {
 
 func (p *SourceGitProvider) Set(str string) error {
 	if strings.TrimSpace(str) == "" {
-		return fmt.Errorf("no source Git provider given, must be one of: %s",
-			p.Type())
+		return fmt.Errorf("no source Git provider given, please specify %s",
+			p.Description())
 	}
 	if !utils.ContainsItemString(supportedSourceGitProviders, str) {
 		return fmt.Errorf("source Git provider '%s' is not supported, must be one of: %v",
-			str, p.Type())
+			str, strings.Join(supportedSourceGitProviders, ", "))
 	}
 	*p = SourceGitProvider(str)
 	return nil
diff --git a/internal/flags/source_oci_provider.go b/internal/flags/source_oci_provider.go
index a21c337a..013619fe 100644
--- a/internal/flags/source_oci_provider.go
+++ b/internal/flags/source_oci_provider.go
@@ -52,7 +52,7 @@ func (p *SourceOCIProvider) Set(str string) error {
 	}
 	if !utils.ContainsItemString(supportedSourceOCIProviders, str) {
 		return fmt.Errorf("source OCI provider '%s' is not supported, must be one of: %v",
-			str, p.Type())
+			str, strings.Join(supportedSourceOCIProviders, ", "))
 	}
 	*p = SourceOCIProvider(str)
 	return nil
diff --git a/internal/flags/source_oci_verify_provider.go b/internal/flags/source_oci_verify_provider.go
index b2fdaba4..5cd68b49 100644
--- a/internal/flags/source_oci_verify_provider.go
+++ b/internal/flags/source_oci_verify_provider.go
@@ -40,7 +40,7 @@ func (p *SourceOCIVerifyProvider) Set(str string) error {
 	}
 	if !utils.ContainsItemString(supportedSourceOCIVerifyProviders, str) {
 		return fmt.Errorf("source OCI verify provider '%s' is not supported, must be one of: %v",
-			str, p.Type())
+			str, strings.Join(supportedSourceOCIVerifyProviders, ", "))
 	}
 	*p = SourceOCIVerifyProvider(str)
 	return nil