v2.1.316

Claude Code v2.1.316 adds new environment variables including CLAUDE_CODE_DISABLE_ULTRATHINK, CLAUDE_CODE_DISABLE_LOOPED_CROSS_CERT_DROP and CLAUDE_CODE_SUBAGENT_EFFORT, plus pooled group budgets, layered policy mode and Bedrock input tagging for the Claude apps gateway. It deprecates fast mode for Opus 4.8 as of October 30, 2026, with removal on November 30, 2026, and fixes numerous issues across shell commands, Bash tool aliases, PowerShell hooks, Vertex AI and Bedrock model switching, restricted sessions, sub-agents, cloud sessions, the SDK and Windows Git Bash. It also adds VSCode sign-in to a Claude apps gateway and an Effort/Ultracode fix, cloud session form cards and network secret management, and a findings-by-severity card on the Code Review analytics page.