---
url: /docs/5.x/reference/diagnostics/kubb-deprecated.md
description: >-
  The KUBB_DEPRECATED diagnostic flags a schema or operation marked deprecated
  in your OpenAPI document.
---

# KUBB\_DEPRECATED: Deprecated

Code: `KUBB_DEPRECATED`
Level: info

A referenced schema or operation is marked `deprecated`.

## What happened

The OpenAPI adapter found `deprecated: true` on a schema while walking the named component schemas. Kubb still generates it. The notice is informational and never fails the build. The adapter reports it on every run.

## How to fix it

Migrate off the deprecated definition if the notice is unwanted. Leave it in place if you still depend on it. The diagnostic changes nothing about the output.

## Example

```yaml [petStore.yaml]
components:
  schemas:
    Pet:
      type: object
      deprecated: true
      properties:
        id:
          type: string
```

## Example output

```text [Terminal]
[KUBB_DEPRECATED]: This schema is marked as deprecated.
  at: #/components/schemas/Pet
  see: https://kubb.dev/docs/5.x/reference/diagnostics/kubb-deprecated
```

## See also

* [`kubb validate`](/docs/5.x/reference/commands/validate)
* [Diagnostics reference](/docs/5.x/reference/diagnostics)