Claude Code sessions can now message each other across machines
The 2.1.225 update also surfaces gateway spend caps inline and fixes macOS MCP OAuth 401s — landing as DeepMind open-sources its WeatherNext 2 forecaster.
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Fleet mode: one session hails another
SendMessage can now open a conversation with a Remote Control session on another machine by name, with no prior contact — so a lead agent can dispatch work to workers you left running elsewhere, and ListAgents shows who's reachable.
Spend caps you can finally see
Gateway spend-limit warnings now name the cap, its reset time, and the operator's message, so you learn a job is about to be throttled instead of watching it die mid-run.
macOS MCP OAuth stops dropping to 401
Two fixes end the intermittent 401 loops that broke MCP connectors after keychain read timeouts, plus transient 401s that killed headless sessions until a restart — steadier connectors for anyone wiring up tools.
Elsewhere: DeepMind open-sources WeatherNext 2
Weights and code are on GitHub; the 2-mini variant runs in a free Colab on a single TPU and produces a 15-day, up-to-1,000-member cyclone ensemble in under a minute — a weekend weather backend that used to need a supercomputer.