diff --git a/app/assets/api/schemas_in.py b/app/assets/api/schemas_in.py
index eed9fe4cd..c5a8ae75a 100644
--- a/app/assets/api/schemas_in.py
+++ b/app/assets/api/schemas_in.py
@@ -54,7 +54,7 @@ class ListAssetsQuery(BaseModel):
     include_tags: list[str] = Field(default_factory=list)
     exclude_tags: list[str] = Field(default_factory=list)
     name_contains: str | None = None
-    job_ids: list[str] = Field(default_factory=list)
+    job_ids: list[str] = Field(default_factory=list, max_length=500)
 
     # Accept either a JSON string (query param) or a dict
     metadata_filter: dict[str, Any] | None = None
@@ -105,7 +105,7 @@ class ListAssetsQuery(BaseModel):
         for s in raw:
             try:
                 canonical = str(uuid.UUID(s))
-            except (ValueError, AttributeError) as e:
+            except ValueError as e:
                 raise ValueError(f"job_ids must be UUIDs: {s!r}") from e
             if canonical not in seen:
                 seen.add(canonical)
diff --git a/openapi.yaml b/openapi.yaml
index 94a05593b..148d4f3dd 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -1559,8 +1559,13 @@ paths:
         - name: job_ids
           in: query
           schema:
-            type: string
-          description: "Comma-separated UUIDs to filter assets by associated job."
+            type: array
+            items:
+              type: string
+              format: uuid
+          style: form
+          explode: true
+          description: "Filter assets by associated job UUIDs. Accepts repeated query params (e.g. `?job_ids=a&job_ids=b`) or a single comma-separated value (`?job_ids=a,b`)."
         - name: include_public
           in: query
           schema: