diff --git a/spacy/cli/_util.py b/spacy/cli/_util.py
index f1ab2effc..4ed316219 100644
--- a/spacy/cli/_util.py
+++ b/spacy/cli/_util.py
@@ -195,7 +195,7 @@ def get_checksum(path: Union[Path, str]) -> str:
         for sub_file in sorted(fp for fp in path.rglob("*") if fp.is_file()):
             dir_checksum.update(sub_file.read_bytes())
         return dir_checksum.hexdigest()
-    raise ValueError(f"Can't get checksum for {path}: not a file or directory")
+    msg.fail(f"Can't get checksum for {path}: not a file or directory", exits=1)
 
 
 @contextmanager
@@ -320,9 +320,9 @@ def git_sparse_checkout(
     repo: str, subpath: str, dest: Path, *, branch: Optional[str] = None
 ):
     if dest.exists():
-        raise IOError("Destination of checkout must not exist")
+        msg.fail("Destination of checkout must not exist", exits=1)
     if not dest.parent.exists():
-        raise IOError("Parent of destination of checkout must exist")
+        msg.fail("Parent of destination of checkout must exist", exits=1)
     # We're using Git and sparse checkout to only clone the files we need
     with make_tempdir() as tmp_dir:
         cmd = (
diff --git a/spacy/schemas.py b/spacy/schemas.py
index 15282e98e..069bd7c0a 100644
--- a/spacy/schemas.py
+++ b/spacy/schemas.py
@@ -283,7 +283,15 @@ class ConfigSchema(BaseModel):
 # Project config Schema
 
 
-class ProjectConfigAsset(BaseModel):
+class ProjectConfigAssetGitItem(BaseModel):
+    # fmt: off
+    repo: StrictStr = Field(..., title="URL of Git repo to download from")
+    path: StrictStr = Field(..., title="File path or sub-directory to download (used for sparse checkout)")
+    branch: StrictStr = Field("master", title="Branch to clone from")
+    # fmt: on
+
+
+class ProjectConfigAssetURL(BaseModel):
     # fmt: off
     dest: StrictStr = Field(..., title="Destination of downloaded asset")
     url: Optional[StrictStr] = Field(None, title="URL of asset")
@@ -291,6 +299,13 @@ class ProjectConfigAsset(BaseModel):
     # fmt: on
 
 
+class ProjectConfigAssetGit(BaseModel):
+    # fmt: off
+    git: ProjectConfigAssetGitItem = Field(..., title="Git repo information")
+    checksum: str = Field(None, title="MD5 hash of file", regex=r"([a-fA-F\d]{32})")
+    # fmt: on
+
+
 class ProjectConfigCommand(BaseModel):
     # fmt: off
     name: StrictStr = Field(..., title="Name of command")
@@ -310,7 +325,7 @@ class ProjectConfigCommand(BaseModel):
 class ProjectConfigSchema(BaseModel):
     # fmt: off
     vars: Dict[StrictStr, Any] = Field({}, title="Optional variables to substitute in commands")
-    assets: List[ProjectConfigAsset] = Field([], title="Data assets")
+    assets: List[Union[ProjectConfigAssetURL, ProjectConfigAssetGit]] = Field([], title="Data assets")
     workflows: Dict[StrictStr, List[StrictStr]] = Field({}, title="Named workflows, mapped to list of project commands to run in order")
     commands: List[ProjectConfigCommand] = Field([], title="Project command shortucts")
     # fmt: on
diff --git a/spacy/tests/test_cli.py b/spacy/tests/test_cli.py
index 104c7c516..448aaf202 100644
--- a/spacy/tests/test_cli.py
+++ b/spacy/tests/test_cli.py
@@ -270,6 +270,41 @@ def test_pretrain_make_docs():
     assert skip_count == 0
 
 
+def test_project_config_validation_full():
+    config = {
+        "vars": {"some_var": 20},
+        "directories": ["assets", "configs", "corpus", "scripts", "training"],
+        "assets": [
+            {
+                "dest": "x",
+                "url": "https://example.com",
+                "checksum": "63373dd656daa1fd3043ce166a59474c",
+            },
+            {
+                "dest": "y",
+                "git": {
+                    "repo": "https://github.com/example/repo",
+                    "branch": "develop",
+                    "path": "y",
+                },
+            },
+        ],
+        "commands": [
+            {
+                "name": "train",
+                "help": "Train a model",
+                "script": ["python -m spacy train config.cfg -o training"],
+                "deps": ["config.cfg", "corpus/training.spcy"],
+                "outputs": ["training/model-best"],
+            },
+            {"name": "test", "script": ["pytest", "custom.py"], "no_skip": True},
+        ],
+        "workflows": {"all": ["train", "test"], "train": ["train"]},
+    }
+    errors = validate(ProjectConfigSchema, config)
+    assert not errors
+
+
 @pytest.mark.parametrize(
     "config",
     [