ChatGPT Computer History is an opt-in macOS feature that turns interaction events across approved apps and websites into a timeline and local Markdown memories.
New Runtime reading: The product boundary is a controlled pipeline: personal opt-in, per-source inclusion, pause and deletion controls, temporary local events, server-side summarization, and durable local memories. The same useful context path also expands prompt-injection and sensitive-data risk.
Evidence boundary: this item uses the listed public sources and keeps vendor, author, or reporter claims attributed. The queued page is an editorial synthesis, not an independent validation of every reported metric.