Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Multi-Host SessionsArea: what it touches
Internal ChangesKind: in v2.1.265,
Internal ChangesSection of the release
What
When Claude Code sends the first, unapproved request for a remote tool call to a host, it now includes a readBaseline field built from the session's record of files it has read. A new noteReadBaselineSent callback fires once the host confirms it received this baseline (read_baseline), and the tool-call dispatch logic now tracks a readBaselineSent flag on the call's outcome, tying into a project_sync read-baseline lookup.
Why
This lets a remote host check, before executing an edit-style tool call, that the file it's about to modify hasn't changed since Claude last read it there, reducing the risk of an edit overwriting changes it never saw.
