Unclear What user-facing feature uses this surface-tracking and hashing is not specified.
What
New internal infrastructure tracks which UI 'surfaces' (such as the desktop app) a plugin's rendered components are attached to, keyed by a client identifier. A related addition computes a content hash covering a plugin's linked files, modules, and runtime limits.
Why
This groundwork lets Claude Code know where a plugin's UI is currently showing and detect when a plugin's linked content has changed, though the finding doesn't specify what feature will consume this tracking yet.
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What user-facing feature uses this surface-tracking and hashing is not specified.