# Provide a Context

## Provide a Context API

The recommended approach is to base your Context API on the `UmbContextBase` class, which provides automatic context registration. The following example shows how it's used:

```typescript
import { UmbContextBase } from '@umbraco-cms/backoffice/class-api';

export class MyCustomContext extends UmbContextBase {
	constructor(host: UmbControllerHost) {
		super(host, MY_CUSTOM_CONTEXT);
	}
}

export const MY_CUSTOM_CONTEXT = new UmbContextToken<MyCustomContext, MyCustomContext>(
	'MyCustomContextUniqueAlias',
);
```

For a practical implementation example, see the [Extension Type Workspace Context](/umbraco-cms/customizing/extending-overview/extension-types/workspaces/workspace-context.md) article.

You can provide a Context API from any Umbraco Element or Umbraco Controller:

```typescript
this.provideContext('myContextAlias', new MyContextApi());
```

Or provide it from a Controller using a `host` reference to the Controller Host (Umbraco Element/Controller):

```typescript
new UmbContextProviderController(host, 'myContextAlias', new MyContextApi());
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.umbraco.com/umbraco-cms/customizing/foundation/context-api/provide-a-context.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.