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Anthropic's memory tool docs used to tell you to exempt memory from context editing. That paragraph was removed between February and August 2026, the cookbook still cites it at a dead anchor, and the surviving combined example ships unprotected in all nine languages.
Context engineering on the Claude platform is not a setting. It is four mechanisms at four points in the pipeline, and the one everybody enables first pays for context window with prompt cache.
Context rot is real and Anthropic now names it in its own docs. The useful question in 2026 is narrower: your Claude model ships with one of two self regulation mechanisms, or with neither, and they do not overlap. Sonnet and Haiku get context awareness free and automatic. Opus needs a beta header. Opus 4.6 gets nothing.
