# MessageRuntime
URL: /docs/api-reference/runtimes/message-runtime

Hooks for accessing message state and edit composer.

`useAui` (Message Actions) \[#useaui-message-actions]

Access message actions via `useAui`:

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

const aui = useAui();

// Reload an assistant message (regenerate the response)
aui.message().reload();

// Switch to the previous or next branch
aui.message().switchToBranch({ position: "previous" });
aui.message().switchToBranch({ position: "next" });

// Submit feedback on a message
aui.message().submitFeedback({ type: "positive" });
aui.message().submitFeedback({ type: "negative" });

// Get the plain-text content of the message
const text = aui.message().getCopyText();

// Access a message part by index or tool call ID
aui.message().part({ index: 0 });
aui.message().part({ toolCallId: "call_123" });

// Access an attachment by index
aui.message().attachment({ index: 0 });

// Access the edit composer for this message
aui.message().composer();

// Get a snapshot of the full message state
const state = aui.message().getState();
```

<ParametersTable />

`useAuiState` (Message State) \[#useauistate-message-state]

Access message state reactively:

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

const role = useAuiState((s) => s.message.role);
const content = useAuiState((s) => s.message.content);
const isLast = useAuiState((s) => s.message.isLast);
```

<ParametersTable />

`useAuiState` (Edit Composer) \[#useauistate-edit-composer]

Access the edit composer state (used when editing a message):

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

const editText = useAuiState((s) => s.message.composer.text);
const isEditing = useAuiState((s) => s.message.composer.isEditing);
```

<ParametersTable />