The problem:

List-to-List Custom Relationships (the only type that supports rollup fields showing Custom Fields from linked tasks) can only be created at the individual list level.

There's no way to define a relationship at Space or Folder level that says:

"every list in this location has a relationship with [target list]."

New lists created in that location don't inherit it either.

This means:

- Every new list requires the same manual relationship setup, repeated identically each time.

- Rollup fields (e.g. showing a "Next Action" field from a linked task) must also be manually added per list

- Automations cannot create Custom Relationships or rollup fields, so the "Create List" automation action can't include this config

- Super Agents / AI tools have no access to create relationships or rollups either, so even an agentic workflow can't handle this step

What should exist:

Space/Folder-level List-to-List Relationships: define once that "every list in this Space/Folder has a relationship with [defined list]."

Any new list created (manually, via automation, or by an Agent) would automatically inherit that relationship.

Inherited rollup fields: rollup columns configured at Space/Folder level should cascade to new lists, the same way Custom Fields do.

AI/Automation access: creating Custom Relationships and rollup fields should be available as automation actions and as Super Agent tools, so these can be included in automated project setup workflows.

Use case:

A CRM with client tasks links to a Projects space where each client gets their own project list. Being able to see a field like "Next Action" from the linked client task directly on project tasks (via rollup) is extremely useful, but the per-list manual setup makes it impractical to maintain, especially when new lists are created frequently via automation.

The logic is simple: "every list in this space relates to this other list." The current implementation just doesn't support that level.