diff --git a/docs/schema/vault-v1/vault-v1.schema.json b/docs/schema/vault-v1/vault-v1.schema.json
index a090acd..91d47ee 100644
--- a/docs/schema/vault-v1/vault-v1.schema.json
+++ b/docs/schema/vault-v1/vault-v1.schema.json
@@ -78,7 +78,7 @@
       "required": ["url"],
       "properties": {
         "url": { "type": "string", "pattern": "^https://", "minLength": 9, "maxLength": 500, "description": "https-only evidence URL with content after the scheme (plain http and every other scheme are rejected)." },
-        "label": { "type": "string", "maxLength": 120, "description": "Optional short display label, e.g. 'conference talk' or 'launch post'." }
+        "label": { "type": "string", "minLength": 1, "maxLength": 120, "description": "Optional short display label, e.g. 'conference talk' or 'launch post'." }
       },
       "additionalProperties": false
     },
diff --git a/src/traitprint/schema.py b/src/traitprint/schema.py
index 0db184e..bbbfb2e 100644
--- a/src/traitprint/schema.py
+++ b/src/traitprint/schema.py
@@ -195,7 +195,9 @@ class ArtifactLink(BaseModel):
     model_config = ConfigDict(extra="forbid")
 
     url: str = Field(min_length=len("https://") + 1, max_length=ARTIFACT_URL_MAX)
-    label: str | None = Field(default=None, max_length=ARTIFACT_LABEL_MAX)
+    label: str | None = Field(
+        default=None, min_length=1, max_length=ARTIFACT_LABEL_MAX
+    )
 
     @field_validator("url")
     @classmethod
diff --git a/tests/test_schema.py b/tests/test_schema.py
index 2ea75c8..3e49369 100644
--- a/tests/test_schema.py
+++ b/tests/test_schema.py
@@ -332,6 +332,13 @@ def test_label_length_cap(self) -> None:
         with pytest.raises(ValidationError):
             ArtifactLink(url=url, label="x" * (ARTIFACT_LABEL_MAX + 1))
 
+    def test_empty_label_rejected(self) -> None:
+        # Cloud parity: an empty label is rejected, not stored — a label
+        # is either meaningful text or absent (None).
+        with pytest.raises(ValidationError):
+            ArtifactLink(url="https://example.com", label="")
+        assert ArtifactLink(url="https://example.com", label=None).label is None
+
     def test_max_links_per_entity(self) -> None:
         links = [
             {"url": f"https://example.com/{i}"} for i in range(MAX_ARTIFACT_LINKS)