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Claude now displays a helpful message when auto-compact is enabled: "Auto-compact is enabled. When the context window is nearly full, older messages will be automatically summarized so you can continue working seamlessly. There is no need to stop or rush — you have unlimited context through automatic compaction."
Evidence
Notification message (search for "Auto-compact is enabled")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.