# ComposerRuntime
URL: /docs/api-reference/runtimes/composer-runtime

Runtime for programmatically controlling the message composer.

The composer runtime allows you to view or edit anything related to how new information is added and sent. For instance you can use the composer runtime to read the state, add attachments, update text, send a message, etc.

`useAui` (Composer Actions) \[#useaui-composer-actions]

Grabs the nearest composer (whether it’s the edit composer or the thread’s composer) via `useAui`:

```tsx
// Example
import { useAui } from "@assistant-ui/react";

const aui = useAui();

// set the text
aui.composer().setText("Hello from the composer");

// send whatever is in the composer
aui.composer().send();

// get the current text in the composer state
const composerState = aui.composer().getState();
const currentText = composerState.text;

```

<ParametersTable />

`useAuiState` (Thread Composer State) \[#useauistate-thread-composer-state]

Access the thread’s new message composer state:

```tsx
import { useAuiState, useAui } from "@assistant-ui/react";

const text = useAuiState((s) => s.composer.text);
const isEmpty = useAuiState((s) => s.composer.isEmpty);

// For actions, use useAui
const aui = useAui();

// set the text
aui.composer().setText("Hello from the thread composer");

// send whatever is in the thread composer
aui.composer().send();

```

<ParametersTable />

`useAui` (Edit Composer Actions) \[#useaui-edit-composer-actions]

Access edit composer actions via `useAui` from within a message component:

```tsx
import { useAui } from "@assistant-ui/react";

const aui = useAui();

// Begin editing the current message (populates the composer with its content)
aui.message().composer().beginEdit();

// Update the text and send the edit
aui.message().composer().setText("Updated message text");
aui.message().composer().send();

// Cancel editing without saving
aui.message().composer().cancel();
```

<ParametersTable />

`ThreadComposerState` \[#threadcomposerstate]

The state of the thread composer which is the composer the user can interact with at the bottom.

<ParametersTable />