Agent memory becomes useful when it reduces future reconstruction work. Saving everything does not meet that standard: it creates a larger search problem and increases privacy risk.
Select events by consequence
An event deserves durable memory when it changes the direction of the implementation, closes off a credible alternative, or explains a resolution that would otherwise look arbitrary.
Routine commands, formatting changes, and obvious implementation details should stay out of the trail.
Give every event a shape
Structured fields make memory easier to validate and render. A decision can require context, reasoning, alternatives, and provenance. A resolution can require a link to the problem it closes.
That structure also limits invention. If reasoning was never supplied, the agent should not manufacture it to make the record feel complete.
Keep the human boundary visible
Agent-proposed approaches and developer decisions are not the same thing. A trustworthy memory system preserves both roles. This makes the record more accurate and more useful during review.
For an end-to-end example, read why commits need an engineering decision trail or follow the Journey setup guide.