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281d730af4
Deleting an agent team was impossible without a workaround. Three guards
formed a cycle:
- `delete_team` refuses while agents still reference the team ("Delete or
reconfigure them first")
- `validate_persona_deletion` refuses to delete a team's agent ("Delete the
team to remove all team agents together")
- and the team editor's submit button required at least one selected member,
so the roster could not be emptied either
Delete-team said "remove the agents first", delete-agent said "delete the
team first", and emptying the roster — the one sequence that breaks the
cycle — was blocked by the UI. The only escape was to reassign a member to
another team to drain the original.
The backend already supported zero-member teams: `update_team` has no
minimum-member check, `apply_team_membership_delta` detaches the removed
members' instances (clearing the `team_id` that `delete_team` keys on), and
`persona_ids: []` is representable in `teams.json`. Only the frontend
enforced the minimum, so this drops that one condition — extracted as
`canSubmitTeamDialog` so the contract is unit-testable.
Removing the minimum makes an empty team reachable, which would have
silently exposed Deploy/Duplicate/Share on a team with nothing to deploy.
Sharing one would mint a snapshot that Buzz's own importer rejects
("Team snapshot must have at least one member" — snapshot import keeps its
minimum, correctly). Those three actions are now gated on
`resolution.isUsable`, which was already false for an empty roster, and the
team card explains the state. Edit and Delete stay enabled: emptying a team
and then deleting it is the intended way out.
Tests: an e2e walk of the full user sequence (edit → deselect every member →
save → delete), which fails on the disabled Save button without this change;
a Rust test pinning that clearing `team_id` really drops the delete guard;
and unit coverage for the submit gate and the emptied-team resolution.
Signed-off-by: Fizz <550f2cb2562fc05f87c4839dc3c9b1bfca4d68db4183f8b54d3d477f6836a91d@buzz.block.builderlab.xyz>
Co-authored-by: Storme Briscoe <storme@squareup.com>
Signed-off-by: Storme Briscoe <storme@squareup.com>