Under the hood
A new reusable template for building system-reminder messages was added internally
What
A new internal template string was added that wraps content in a <system-reminder> tag. System reminders are short notes Claude Code injects into the conversation to give the model extra context it wouldn't otherwise have. This looks like a reusable building block for constructing one, rather than a new reminder itself.
Why
This is small internal refactoring-style plumbing; it doesn't change what reminders say, just how one gets assembled.
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What specific content this template is used to prefix, or when it fires, is not stated.