Module parser 

Pulling A2UI out of a model’s response.

When A2UI is generated by prompting rather than by structured output, the model returns prose with one or more A2UI blocks embedded in it, fenced by A2UI_OPEN_TAG and A2UI_CLOSE_TAG. parse_response splits that into ordered ResponseParts: the conversational text preceding each block, and the block’s parsed JSON.

Why this is a scanner and not a string split

A close tag can appear inside a JSON string literal — a Text component whose content mentions </a2ui-json> is perfectly legal — so the scanner tracks string state and escapes rather than searching for the next occurrence.

Repairing model output

parse_and_fix applies the two repairs that are safe because they cannot change the meaning of valid JSON: normalizing smart quotes, and dropping trailing commas. It only reaches for them after a straight parse has failed, and it wraps a lone object in an array, since A2UI payloads are always lists of messages.

Structs

ResponsePart

One segment of a model response.

Functions

has_a2ui_parts

Whether the content contains a complete A2UI block.

parse_and_fix

Parses a raw A2UI block, repairing the model’s usual JSON slips.

parse_response

Splits a full model response into text and parsed A2UI blocks.

unwrap_response

Splits a response into parts without parsing the block contents.