Claude Code v2.1.144 adds /resume for background sessions and subagent duration notifications

The /resume-for-background work is the headline developer feature. Claude Code users running long-horizon agents in the background can now drop in and out — picking up sessions previously orphaned by terminal closure or context loss. Combined with elapsed-duration notifications, the release directly targets the 'finally usable for >2-hour tasks' workflow that Hacker News commenters have been asking for since the v2.0 reset.

The /plugin browse timestamp surfacing is a small but signal-rich change: Anthropic is treating its plugin ecosystem as a live marketplace where freshness matters, not a one-time install graph. Combined with the Stainless acquisition (same day, separate story), Claude Code is being built as a flagship developer surface, not a side product.

SandboxAQ's drug-discovery model integration through Claude is the vertical proof-point — accessing specialized scientific models via a familiar chat interface, betting that access (not raw model quality) is the enterprise adoption bottleneck. Direct competitive pressure on Chai Discovery and Isomorphic Labs (Google's drug-discovery sibling). For Anthropic this is also a defensive move on Pharma/biotech accounts where verticalized labs were starting to win.

Watch next: whether Anthropic publishes usage data on background-session lengths (the >2-hour autonomy claim is the headline benchmark), and whether the Ramp AI Index lead translates to Bedrock and Vertex revenue share gains in Q2.