My guess (I will test this eventually) is that you set a window size (which may be the model limit, or lower to reduce input token costs), the harness then refu

My guess (I will test this eventually) is that you set a window size (which may be the model limit, or lower to reduce input token costs), the harness then refuses to show items that don't fit. If the model emits a command to read a file, the harness then says "File hidden due to lack of context space". In the system prompt, the model is informed about the context space usage, and that it can hide files. It needs to be instructed that if files contain something noteworthy, that the agent notes this down in their notes, which should always be rendered into the context. If this fails, the agent will hide a file with relevant information and then get lost in circles. If it succeeds, the agent can work on larger tasks autonomously. So it's worth trying.