awesome! Unfortunately, calling artifact["foo"].get() gave me:
Could not retrieve a local copy of artifact foo, failed downloading file:///checkpoints/test_task/test_2.fgjeo3b9f5b44ca193a68011c62841bf/artifacts/foo/foo.json
It tries to get it from the local storage, but the json is stored in s3 (it does exists) and I did create both tasks specifying the correct output_uri (to s3)