Add clickable link in field description property?

Based on the documentation, yes, you can add clickable links in field descriptions! When using .jsx or .tsx file extensions for your schema files, the description property supports basic JSX formatting.

Here's an example from the defineField documentation:

defineField({
  name: 'myField',
  type: 'string',
  description: (
    <details>
      <summary>Why is this important?</summary>
      The Googlebot is an indexer of...
    </details>
  )
})

So for a clickable link, you can do something like:

defineField({
  name: 'myField',
  type: 'string',
  description: (
    <>
      This field is used for X. See <a href="https://example.com" target="_blank" rel="noopener noreferrer">our documentation</a> for more details.
    </>
  )
})

Important note: This JSX support only works when your schema file has a .jsx or .tsx extension. If you're using plain .js or .ts files, you'll need to rename them to use this feature.

The JSX support is described as "basic," so you can use standard HTML elements like <a>, <details>, <summary>, and other common formatting tags to make your descriptions more helpful for content editors.