It is out of your control basically, except to continue to be vocal here. I have had this issue forwarded to OpenAI support about the damage it is doing. Yet it continues.
Cause where I’ve had to continue to answer the same issues across a spectrum of API developers that have found their way here:
Feel free to search the forum over the last two weeks and find more of the same file search internal tool issues coincident with Responses and brought to Assistants. An insistent jamming of a system instruction right before your user input as if “user files” from a developer must be provoked in every response.