Represents a semantically meaningful content unit exchanged between the model and the user.

Conceptually, each Part encapsulates a piece of data that contributes to a chat message — such as text, a function invocation, or an image.

For example, a single message consisting of a sequence like (text..., image, text...) is represented as a Message containing an array of three Part elements.

Note that a Part does not carry "intent", such as "reasoning" or "tool call". These higher-level semantics are determined by the context of a [Message].

Example

Rust

let part = Part::text("Hello, world!");
assert!(part.is_text());
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