Claude Code reads AGENTS.md, ships Opus 5.5 default at 1M context
The 2.1.280 wave ends per-tool config duplication, auto-archives idle VS Code sessions, and trims auto-mode billing — plus Intrinsic frees its robot stack.
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One instructions file, every agent
Claude Code now reads AGENTS.md directly when no CLAUDE.md exists, and a new claude-md-and-agents-md setting loads both. The config you already keep for Codex and Cursor now drives Claude Code too, so there's no reason to maintain parallel instruction files per tool.
Opus 5.5 is the default now, at 1M context
v2.1.280 makes Claude Opus 5.5 the default Opus model with a 1M-token window, and adds fullscreen mouse support for lists and skill selection. Large-repo sessions stop needing a manual model switch to get the long context.
Auto mode stops charging you for the classifier
For API and Enterprise users, auto mode moved to server-side classifier billing in v2.1.278, eliminating the extra classifier-token overhead, with a status row showing when it's running server-side. Heavy auto-mode users pay less per turn.
VS Code quietly archives idle sessions
The VS Code extension now auto-archives sessions untouched for 14 days (configurable), so your session list stops growing without bound. Minor, but it declutters a sidebar that used to only accumulate.
Elsewhere: Google open-sources its robotics stack
Alphabet's Intrinsic released Intrinsic Core under Apache 2.0 at ROSCon 2026, bundling hardware-agnostic control, pose estimation, motion planning, and a local ROS 2 runtime. If you've wanted to prototype robot behaviors without committing to one vendor's stack, the pieces are now free.
Elsewhere: Codex and Gemini CLI harden up
Codex CLI v0.155 added Touch ID verification for MCP requests on macOS plus AWS Bedrock credential support; Gemini CLI v0.60 shipped a security release fixing web-fetch validation and adding MCP OAuth (RFC 9207). Update both if you run them.