> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cordango.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Core apps

> Data the platform already has.

Some records are not yours to model. People, Organizations and Calendar are **core apps** provided
to every workspace.

They are not in your repository, so you will not find them by reading files.

```bash theme={null}
cordango inspect
```

That lists them along with their entity keys.

## Check before you declare

Before you add an entity, ask whether it already exists. A company, a customer, a supplier, an
employee, a calendar event: each of these already has a canonical record.

<Warning>
  A second copy of Organizations is the one mistake this layout cannot undo for you later. Everything
  else you can add and remove; two competing sources of truth for who your customers are will outlive
  the decision that created them.
</Warning>

## Pointing at one

An ordinary reference field with `targetApp` set:

```yaml theme={null}
fields:
  customer:
    type: reference
    label: Customer
    targetApp: core_organizations
    target: organization
```

Nothing about this needs an instance, an account or a login. It resolves offline, and
`cordango check` validates it offline.

## The key is not the label

```bash theme={null}
cordango vocabulary core organizations
```

This gives you the entity key, the label, and every field the core app already carries. They differ
more often than you would expect: Organizations calls `organization` a "Company".

Look before you point. A reference to a key that does not exist is a `cordango check` error, but a
reference to the wrong key of the right app is not, and that one you find later.

<Note>
  **Platform features are currently in invite-only beta.**
  [Sign up here](https://www.cordango.com/beta/) to be considered for one of our next phases.
</Note>

## Why they are central

Core apps are what make a workspace a company system rather than a folder of unrelated
applications. Two apps that both reference `core_organizations` are talking about the same company,
which is what lets a record in one app mean something in the other.

That resolution is provided by Cordango Platform. A standalone generated application gets its own
built-in directory instead, emitted as part of its runtime.