Claude Code v2.1.203 — Background Agent Reliability Overhaul
Anthropic shipped Claude Code v2.1.203 on July 7, 2026, and it is a release that every team running background agents has been waiting for. After a rough stretch of reliability issues that crept in with v2.1.196, this update addresses a cluster of critical bugs that could leave background sessions unresponsive, restarting from scratch, or stalling for nearly half a minute on macOS. What Was Breaking — and What’s Fixed macOS Stall on Session Open (15–20 Seconds) The headline regression from v2.1.196 is gone. Background and agent-view sessions on macOS were stalling for 15 to 20 seconds when opening or switching — the result of a false low-memory detection that triggered unnecessary throttling. v2.1.203 corrects the detection logic, and session opens should feel immediate again. ...