Editor autocompletion for object files
Archival's TOML schemas are published in the SchemaStore catalog, so your editor completes object definitions on its own.
Add the schema comment to the top of your archival_objects.toml:
#:schema https://archival.dev/schemas/archival_objects.schema.json
Your editor will complete field types, flag a definition that can't build, and explain the reserved keys inline. The same schemas are in the SchemaStore catalog, so most editors pick them up with no comment at all.