docs: Claude Code v2.1.260 - /diff panel, Ctrl+L clears screen, new security blocks, ant apply, new Anthropic repo

[claude-yolo]

Night shift report

WHY THIS MATTERS: This run is busy: v2.1.260 ships a new live diff panel that stays open beside your conversation as Claude edits files, changes Ctrl+L to actually clear the screen in fullscreen mode (a behavior break from older versions), and documents new agentic security classifier rules that block cloud-metadata credential grabs and reverse shells. The ANT CLI gets ant apply for infrastructure-as-code agent management. discovery.json found a brand-new Anthropic public repo. Two new support articles document public chat sharing. All of these are user-visible or editorial events.

HIGHLIGHTS:

• New /diff panel (v2.1.260, fullscreen only): opens beside the conversation rather than replacing the prompt, live-updates as Claude edits files, auto-opens at ≥144 columns, lets you select lines to ask Claude about. Cycles comparison base with Ctrl+X B (session → uncommitted → branch). New DiffPanel keybinding context added.
• Ctrl+L now clears the screen in fullscreen rendering (v2.1.260 behavior change): before this, it only redrew. Older behavior is documented for users upgrading.
• New auto-mode security blocks (v2.1.257+): classifier now blocks requests to the cloud instance-metadata endpoint (169.254.169.254), tunnels/reverse shells to public hosts, reading host-level credentials (node certs, registry auth), and scanning sibling containers/pods/VMs. Opt-out via new Host containment entry in autoMode.environment. Documented in permission-modes.md and auto-mode-config.md.
• New error documented — task output swap refused (tasks dir moved or linked): shows when the tasks temp dir has been moved or symlinked. Fix is to upgrade to v2.1.260 (false-positive rate reduced) or restart with CLAUDE_CODE_TMPDIR pointing at a fresh directory.
• preserved-thinking.md expanded from stub to full reference (~1,100 lines added): now the canonical home for model-switching behavior, prefix-check rules, compaction shapes (simple, keep-tail, background), and the thinking-binding-controls-2026-08-01 beta controls. The thinking.md section now links out to it instead of duplicating the content.
• ANT CLI v1.30.0 — ant apply (September 3 release note): creates and updates agents, environments, skills, memory stores, and deployments from repo files; writes claude-lock.json for idempotent CI runs. Infrastructure-as-code pattern for Managed Agents.
• New Anthropic repo in discovery.json: anthropics/fermats-last-theorem appeared in github_org_anthropics.not_fetched. Sounds like a formal-math or proof-assistant repo. Human decision needed on whether to archive it.
• Two new support articles on chat sharing: 16762437-public-links-for-shared-chats.md (public link behavior, noindex, privacy caveats) and 16762496-share-a-chat-with-specific-people.md (email invite flow). New sharing UX landed upstream.
• Claude Desktop/Cowork v1.46388.2–3: Cowork now supports attaching home folder, Windows Documents, AppData, macOS Library, and whole drives (with Claude's own config/credentials still blocked). Code: git-worktree session init fix on Windows.
• Claude for Government: active-session limit changed from 3 shared across apps to 6 per app; new sign-in over the limit evicts the soonest-to-expire session instead of the oldest.

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Created by night-shift claude-yolo
Day-shift claude-yolo will review and merge this in the morning