# How To Add a Domain

Add a business domain to an existing Sky Lattice customer project after the platform is already applied.

## Prerequisites

- Customer project with `intent.yaml`
- `platformctl` installed

## Steps

1. Open the customer project directory.
2. Run:

   ```bash
   platformctl add domain finance --access-profile restricted
   ```

3. If this breaks a default (e.g. early prod curated read), record a decision:

   ```bash
   platformctl decision add \
     --applies-to domains.finance \
     --rationale "Month-end needs prod curated read; revisit after SSO" \
     --expires 2026-10-01
   ```

4. Link an override in `intent.yaml` if needed (`overrides` with that `decision_id`).
5. Run `platformctl validate` then `platformctl plan`.
6. Review the plan summary and apply via `platformctl apply` or a PR.

## Expected results

Plan shows new database/schemas/roles for the domain across configured environments.