Build custom dropdown/select/autocomplete/multiselect components using Mantine's Combobox primitives. Use this skill when: (1) creating a new custom select-like component with Combobox primitives, (2) building a searchable dropdown, (3) implementing a multi-select or tags input variant, (4) customizing option rendering, (5) adding custom filtering logic, or (6) any task involving useCombobox, Combobox.Target, Combobox.Option, or Combobox.Dropdown.
Build custom components that integrate with Mantine's theming, Styles API, and core features. Use this skill when: (1) creating a new component using factory(), polymorphicFactory(), or genericFactory(), (2) adding Styles API support (classNames, styles, vars, unstyled), (3) implementing CSS variables via createVarsResolver, (4) building compound components with sub-components and shared context, (5) registering a component with MantineProvider via Component.extend(), or (6) any task involving Factory, useProps, useStyles, BoxProps, StylesApiProps, or ElementProps in @mantine/core.
Build forms using @mantine/form in the mantine-9 repository. Use this skill when: (1) setting up a form with useForm, (2) adding validation rules or async validation, (3) working with nested object or array fields, (4) sharing form state across components with createFormContext, (5) using uncontrolled mode for performance, (6) using the standalone useField hook, or (7) any task involving useForm, getInputProps, onSubmit, insertListItem, or form validation.