Cross-Session Messaging Reaches Bedrock, Vertex and Foundry, and Bad crossSessionInbound Values Now Fail Loudly

Claude Code Changelog·medium signalXBlueskyLinkedInCopy link

2.1.248 enables `SendMessage` / `ListAgents` between sessions on the same machine on Bedrock, Vertex and Foundry, and when telemetry is disabled, removing the first-party-endpoint requirement that kept enterprise users off multi-session coordination. It also fixes an invalid `crossSessionInbound` value being silently ignored: it now warns and holds messages under user settings, or refuses them under managed settings. Silently-ignored security config is a worse failure than a loud one, and this was the second such fix in the release alongside a hook-output JSON parse error that used to be treated as plain text.