Unclear It is not clear what you would see differently after resuming.
What
When you resume a conversation, Claude Code now restores rewound state for its interactive code sessions (REPL sessions). It uses the tool calls found in the restored conversation to do this. A tool call is a single action Claude takes, such as running code. The cleanup at the end of the main conversation now runs only when the resumed session is a different one, and Claude Code also notes when a resume happens inside the same running process.
Why
This changes what interactive code session state comes back after a resume.
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The writer flagged doubt
It is not clear what you would see differently after resuming.