Responses API returns zero usage when combining `previous_response_id` + `context_management` + `tools`

Hi and welcome to the community!

Thank you for raising this with the very helpful steps to repro the issue! Subsequently I was immediately able to reproduce the core issue: previous_response_id + context_management + tools returned usage.total_tokens = 0.

During my testing I also found another variant that returns zero token usage: no previous_response_id + context_management + tools

Will flag this to the team!