What changed
Google's Antigravity App 2.31 adds a preview /swarm command for parallel subagents, browser-download approval controls, remote-project setup, voice summaries and MCP app file editing. It also prevents browser pages from locking the pointer or keyboard and adds split-view plugin controls.
Why it matters
Parallel agents and browser downloads widen both execution scale and data-ingress authority. A named approval boundary and input-lock restriction make two concrete failure paths testable before teams enable swarm work or authenticated browsing.
What to do
In a disposable project, run /swarm on independent tasks with a hard budget, trigger an unexpected download and a pointer-lock request, then inspect approvals, duplicate work, merge conflicts, retained files and cancellation before enabling real credentials.
Caveat
The /swarm command is a preview and Google provides no independent reliability, security or productivity evidence. Browser approval behavior, remote-project isolation and MCP file authority still depend on account, plugin and operating-system configuration.