Suggestions stream as JSON with three fields: type, title, and content. OpenAI and Google calls send response_format set to json_schema. The OpenAI-compatible Anthropic layer has no response_format. JSON is an instruction in the system prompt, and on that path Claude can emit content before type. A parser that prints the first string value will show the rest of the object as the suggestion. The braces at the end are still syntax. The parser is a state machine with a short reserve. It holds the tail until the key is identified, then flushes 20 characters or every 100 ms. If type is still missing when the stream starts, it is filled in at finalize. title can arrive after content has already ended, so it is attached then. The same parser runs in LiveSuggest before a suggestion is shown.