> ## Documentation Index
> Fetch the complete documentation index at: https://plain-docs-orca-916-agent-docs-restructure.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Manage the navigation

> Set the order of groups and articles in your Help Center navigation.

The Help Center index defines the order in which article groups and articles appear in the Help Center navigation, as well as the parent-child relationships between them.

<Snippet file="graphql/sdk-note.mdx" />

`updateHelpCenterIndex` replaces the entire navigation tree in a single call. To avoid clobbering concurrent edits, you must include the `hash` returned by the previous `helpCenterIndex` query: if the Help Center has been re-indexed since you read it, the call will fail and you should re-fetch the latest index and re-apply your changes.

Each entry references an existing article or article group by ID, and optionally a parent group ID to nest it within a group.

The `type` field accepts:

* `ARTICLE`: references an existing Help Center article by its `entityId`. The displayed title is taken from the article itself.
* `ARTICLE_GROUP`: references an existing article group by its `entityId`. The displayed title is taken from the group itself.
* `HEADING`: an inline section title that groups the items beneath it in the sidebar. Headings have no backing entity, so you supply your own unique `entityId` (any opaque string, conventionally prefixed `hch_`) and a non-empty `title`. The `title` field is ignored for `ARTICLE` and `ARTICLE_GROUP` items.

<Snippet file="graphql/update-help-center-index.mdx" />