argoproj/argo-workflows · warning

ListObjects is currently not supported for this artifact…

Error message

ListObjects is currently not supported for this artifact type, but it will be in a future version

What it means

The raw artifact driver (inline data stored in the workflow spec via artifacts[].raw.data) does not implement ListObjects; this stub always returns this error. ListObjects is only used for artifact directory listing features (e.g. recursive artifact dir operations), which are meaningless for inline raw content.

Solutions

1. Don't call ListObjects for raw artifacts — raw artifacts hold inline data, not storage keys; read artifact.Raw.Data instead
2. If you need listable storage, switch the artifact to a real backend driver (s3, gcs, azure, etc.)
3. If you control the calling code, special-case raw artifacts and skip listing logic
4. Track/upgrade Argo Workflows versions — the message notes this may be implemented in a future version

Example fix

// before: generic listing for any artifact
keys, err := driver.ListObjects(ctx, artifact)
// after: guard against unsupported drivers
if artifact.Raw != nil {
    return fmt.Errorf("raw artifacts have no keys; use artifact.Raw.Data")
}
keys, err := driver.ListObjects(ctx, artifact)

func supportsListObjects(a *wfv1.Artifact) bool {
    return a != nil && a.Raw == nil // raw artifacts never support ListObjects
}

func isRawArtifact(a *wfv1.Artifact) bool {
    return a != nil && a.Raw != nil
}

// usage
if isRawArtifact(artifact) {
    return errors.New("ListObjects not supported for raw artifacts; read Raw.Data instead")
}

When it happens

Trigger: Any code path invoking ListObjects on an artifact whose artifactDriver is raw — e.g. artifact GC / artifact directory traversal over a raw artifact, or user-facing operations that enumerate artifact keys against a raw artifact.

Common situations: Attempting artifact directory listing or key enumeration on inline raw artifacts; tooling that generically calls ListObjects on all artifact types; feature requests tracked upstream noting ListObjects is not yet implemented for raw.

Related errors

• CodeNotImplemented
• CodeBadRequest
• CodeNotFound
• CodeNotFound
• CodeNotImplemented

AI-assisted analysis of argoproj/argo-workflows@35bff19146 (2026-09-03). Data as JSON: /api/errors/629997edc1b6c618. Report an issue: GitHub.

Appendix: source

Thrown at workflow/artifacts/raw/raw.go:53

}

// Save is unsupported for raw output artifacts
func (a *ArtifactDriver) Save(ctx context.Context, path string, artifact *wfv1.Artifact) error {
	return errors.Errorf(errors.CodeBadRequest, "Raw output artifacts unsupported")
}

// SaveStream is unsupported for raw output artifacts
func (a *ArtifactDriver) SaveStream(ctx context.Context, reader io.Reader, artifact *wfv1.Artifact) error {
	return errors.Errorf(errors.CodeBadRequest, "Raw output artifacts unsupported")
}

// Delete is unsupported for raw output artifacts
func (a *ArtifactDriver) Delete(ctx context.Context, s *wfv1.Artifact) error {
	return common.ErrDeleteNotSupported
}

func (a *ArtifactDriver) ListObjects(ctx context.Context, artifact *wfv1.Artifact) ([]string, error) {
	return nil, fmt.Errorf("ListObjects is currently not supported for this artifact type, but it will be in a future version")
}

func (a *ArtifactDriver) IsDirectory(ctx context.Context, artifact *wfv1.Artifact) (bool, error) {
	return false, errors.New(errors.CodeNotImplemented, "IsDirectory currently unimplemented for raw")
}

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