Represents an incremental update (delta) of a function part.

This type is used during streaming or partial message generation, when function calls are being streamed as text chunks or partial JSON fragments.

Variants

• Verbatim(String) — Raw text content, typically a partial JSON fragment.
• WithStringArgs { name, arguments } — Function name and its serialized arguments as strings.
• WithParsedArgs { name, arguments } — Function name and parsed arguments as a Value.

Use Case

When the model streams out a function call response (e.g., \"function_call\":{\"name\":...}), the incremental deltas can be accumulated until the full function payload is formed.

Example

let delta = PartDeltaFunction::WithStringArgs {
    name: \"translate\".into(),
    arguments: r#\"{\"text\":\"hi\"}\"#.into(),
};
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