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

# Zendesk

> The Zendesk source pulls your Help Center articles into the AI's training index.

<Note>
  This page covers **Zendesk as a knowledge source** — syncing Help Center articles into the AI's training index so replies cite your published content. For **ticketing, Sunshine, channels, and handoff**, see the [Zendesk integration](/integrations/zendesk/overview).
</Note>

The Zendesk source pulls your <Tooltip tip="Zendesk's knowledge base product. Holds public customer-facing articles and internal agent-facing content under sections and categories.">Help Center</Tooltip> articles into the AI's training index. The AI retrieves from them at answer time and can cite them as sources. Sync is <Tooltip tip="Only articles changed since the last run are fetched. The full catalog is pulled on the first run, then only deltas.">incremental</Tooltip> — edits and new articles show up on the next scheduled run.

## What you're signing up for

* **Articles only.** No tickets, users, or organizations. This connector is strictly for training content.
* **All variants.** Published, draft, and archived articles are all fetched. Visibility in OpenCX is derived automatically — see the [Connect](/knowledge/sources/zendesk/connect) page.
* **Every locale.** Articles in each language are synced as separate entries. The AI answers in the language it retrieves from.
* **One Help Center per connection.** If your Zendesk account hosts multiple Help Centers under one API token, only one is synced today.

## Common stumbling blocks

<Warning>
  **The Zendesk source connects to a Zendesk instance via the Support API — it's not a public Help Center crawler.** The **Subdomain** field is your Zendesk instance name (e.g. `acme` from `acme.zendesk.com`), not your public Help Center URL (e.g. `help.acme.com`). If you paste the public URL, the sync will fail with an authentication error.
</Warning>

If you're trying to index a public help center and don't have Zendesk admin credentials, use the [Website crawler](/knowledge/sources/website/overview) against the public URL instead.

***

## Related Documentation

<CardGroup cols={2}>
  <Card title="Connect Zendesk" icon="plug" href="/knowledge/sources/zendesk/connect">
    Subdomain, API token, visibility rules.
  </Card>

  <Card title="Troubleshooting" icon="wrench" href="/knowledge/sources/zendesk/troubleshooting">
    Sync failures, segment surprises, archived articles.
  </Card>

  <Card title="Zendesk integration" icon="headset" href="/integrations/zendesk/overview">
    Ticketing, Sunshine, channels.
  </Card>

  <Card title="Connect a knowledge source" icon="brain" href="/knowledge/sources/overview">
    All sources compared.
  </Card>
</CardGroup>