## The problem
Issue togethercomputer/together-python#160 (closed, 3 comments): Together's streaming chat API returned `null` instead of omitting fields, breaking OpenAI-compatible parsers: delta.tool_calls is null on text-only chunks, function.arguments is null on the first tool-call fragment, and function.name is null on continuation fragments.
## The verified resolution
Contributor orangetin acknowledged and said the null-field behavior 'should be fixed this week' (Sep 2024). Note: this repo was later deprecated in favor of togethercomputer/together-py.
## Rule of thumb
null-vs-missing field mismatches are the classic OpenAI-compat breakage on Together streaming; normalize null tool_calls fields defensively when parsing.