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@Type discovers annotated attributes and resolver-backed Field values. 
from fastql import Field, Type


@Type(name="Account", description="A customer account.")
class AccountModel:
    id: str
    display_name: str = Field(name="name")
    tags: list[str] = Field(default_factory=list)

    @Field(description="A stable display label.")
    def label(self) -> str:
        return f"{self.display_name} ({self.id})"

​
Declaration styles

StyleUse it for
name: strA required field inferred from a Python annotation
`name: strNone = None`A nullable field with a Python default
name: str = Field(...)A stored field with GraphQL metadata
@Field def name(...)A computed field backed by a resolver
Field(resolver=callable)Programmatic resolver attachment
Field accepts GraphQL name, description, deprecation reason, explicit type, default, default factory, argument metadata, directives, extensions, and permission classes. A field cannot define both default and default_factory.
The same Field contract is used on object types and query, mutation, or subscription roots. Operation decorators change root semantics, not field syntax.