# Composer Trigger Hooks
URL: /docs/api-reference/hooks/composer-triggers

Unstable assistant-ui hooks for mention menus, slash commands, and custom composer trigger popovers.

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## API Reference \[#api-reference]

### unstable\_useTriggerPopoverRootContext \[#unstable\_usetriggerpopoverrootcontext]

```ts
const unstable_useTriggerPopoverRootContext: () => TriggerPopoverRootContextValue;
```

### unstable\_useTriggerPopoverRootContextOptional \[#unstable\_usetriggerpopoverrootcontextoptional]

```ts
const unstable_useTriggerPopoverRootContextOptional: () => TriggerPopoverRootContextValue | null;
```

### unstable\_useTriggerPopoverScopeContext \[#unstable\_usetriggerpopoverscopecontext]

```ts
const unstable_useTriggerPopoverScopeContext: () => TriggerPopoverResourceOutput;
```

### unstable\_useTriggerPopoverScopeContextOptional \[#unstable\_usetriggerpopoverscopecontextoptional]

```ts
const unstable_useTriggerPopoverScopeContextOptional: () => TriggerPopoverResourceOutput | null;
```

### unstable\_useTriggerPopoverTriggers \[#unstable\_usetriggerpopovertriggers]

Live map of registered triggers, re-rendering on change. Prefer
`subscribeLifecycle` for incremental add/remove handling.

```ts
const unstable_useTriggerPopoverTriggers: () => ReadonlyMap<string, RegisteredTrigger>;
```

### unstable\_useTriggerPopoverTriggersOptional \[#unstable\_usetriggerpopovertriggersoptional]

Like `useTriggerPopoverTriggers` but returns an empty map outside a root.

```ts
const unstable_useTriggerPopoverTriggersOptional: () => ReadonlyMap<string, RegisteredTrigger>;
```

### unstable\_useMentionAdapter \[#unstable\_usementionadapter]

Deprecated: Under active development and might change without notice.

Creates a spreadable `{ adapter, directive }` bundle for `@` mentions.
Supports tools registered via `useAssistantTool`, explicit items, or both —
flat or categorized.

<ParametersTable />

### unstable\_useSlashCommandAdapter \[#unstable\_useslashcommandadapter]

Deprecated: Under active development and may change without notice.

Bundles slash command definitions (with inline `execute` callbacks) into
`{adapter, action}` that plug directly into `ComposerTriggerPopover`.
`execute` stays in the hook closure and is never attached to the returned
`TriggerItem`, keeping items serializable.

<ParametersTable />

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