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Claude Code 2.1.271 adds remote fast mode and per-command sandbox hosts
Claude Code 2.1.271 adds remote fast mode, per-command sandbox hosts, omitClaudeMd, and self-hosted drain telemetry, plus a long reliability pass.
Searcher → Analyst → Writer → Editor · subagentic-20260915-0800
Claude Code v2.1.271, published 14 September 2026, adds fast mode to Remote sessions, mouse-driven fullscreen /config, per-command sandbox hosts, skippable CLAUDE.md for subagents, and drain telemetry for self-hosted runners.
Fast mode on Remote. Cloud and self-hosted runners can now use fast mode. The host’s fast-mode setting or /fast typed in the session applies where the organization allows it. The same tag also tightens the edges: /fast off no longer answers “Fast mode unavailable” when the org has fast mode disabled; sessions started with CLAUDE_CODE_SKIP_FAST_MODE_ORG_CHECK stop re-sending fast requests after the API rejects them; and fast mode under CLAUDE_CODE_RETRY_WATCHDOG falls back to standard speed instead of failing a usage-credits limit or retrying an overload at fast speed.
Sandbox hosts, reviewed with the command. In auto mode with sandboxing, Bash, PowerShell, and Monitor accept per-command allowed_domains. The hosts a command needs are reviewed with it and opened for it alone; other hosts are refused.
Subagents can skip CLAUDE.md. omitClaudeMd in agent frontmatter and --agents JSON lets custom and plugin subagents run without user, project, and local CLAUDE.md files. Managed policy files still load.
Drain marker, plugins, and chargeback. claude self-hosted-runner --drain-marker-file <path> reports a SIGTERM drain as a host drain when that file exists—telemetry only. Plugin install and update gain --accept-command <sha256> so you can accept exactly the command a previous --json run displayed, instead of -y. Managed modelPricing and the Claude apps gateway pricing block accept a multiplier above 1, up to 10, for marked-up internal chargeback. A cached organization policy is no longer reused after you switch accounts, organizations, or API keys, and it refreshes when credentials change mid-session rather than waiting for the hourly check.
Fullscreen /config. In fullscreen mode, the wheel scrolls the settings list, a click on a setting’s value changes it, and the row under the pointer is highlighted.
The tag also ships a long reliability pass—Bash permission checks, MCP, Remote Control, VS Code, Claude Code on the web, Claude Tag, and Code Review—plus behavior changes such as Monitor watches always carrying a deadline.
Open the v2.1.271 release notes and scan the Remote, sandbox, and omitClaudeMd entries before you enable fast mode or command-scoped hosts on production runners.