Claude Code 2.1.271-2.1.272: what changed (Remote fast, omitClaudeMd, sandbox domains)

2.1.271 ships Remote fast, per-command sandbox domains, omitClaudeMd, and tighter Monitor defaults. 2.1.272 is bug fixes only. Thin release fiche, not a migration guide.

2.1.271 (released 2026-09-14) is the feature-heavy release: Remote fast mode, per-command sandbox domains, omitClaudeMd, exact plugin command approval, and tighter Monitor / workflow defaults. 2.1.272 (2026-09-15) is described only as bug fixes and reliability improvements; individual fixes are not disclosed in the CHANGELOG. Thin radar fiche - not a migration guide. P0 interrupt: No.

TL;DR. Attribute every feature bullet to 2.1.271. Treat 2.1.272 as a generic reliability day. Upgrade readout below; no cascade rewrite.

The three headline operator deltas (2.1.271)

All three are 2.1.271 only (CHANGELOG):

Remote /fast - Fast mode now works in Claude Code Remote sessions on cloud and self-hosted runners. The host’s fast-mode setting or /fast typed in the session applies where the organization allows it.
Per-command allowed_domains - Bash, PowerShell, and Monitor in auto mode with sandboxing support per-command allowed_domains: hosts a command needs are reviewed with it and opened for that command alone; other hosts are refused.
omitClaudeMd - Agent frontmatter and --agents JSON can set omitClaudeMd, so custom and plugin subagents run without user, project, and local CLAUDE.md files. Managed policy files still load.

Smaller but actionable (still 2.1.271)

Exact plugin command approval - claude plugin install and claude plugin update add --accept-command <command>, accepting exactly the command a previous --json run displayed, instead of broad -y.
Monitor and workflow defaults - Monitor watches always have a deadline (at most 30 minutes; 10 in single-prompt -p runs) and notify Claude to re-arm, replacing the no-timeout persistent option. Default dynamic workflow size is small on Pro; medium guideline drops from 15 to 10 agents.

Other 2.1.271 notes (e.g. modelPricing / gateway multiplier up to 10, many fixes) exist in the CHANGELOG; this fiche stays on the five operator standouts above.

What 2.1.272 tells us

CHANGELOG 2.1.272 wording, exact:

Bug fixes and reliability improvements

No itemized 2.1.272 bullets in the supplied sources. Do not backfill fixes from 2.1.271 into 2.1.272, and do not invent a breaking-change story.

Upgrade readout

Operator	What to check after upgrading past 2.1.271
Remote	Org fast-mode policy; try `/fast` in a Remote session
Sandbox / auto mode	Commands that relied on a session-wide domain allow list - scope is now per-command
Agent authors	Whether a subagent should inherit repo / user / local `CLAUDE.md`; managed policies still load
Monitor / workflows	Deadlines (30 / 10 min); smaller Pro workflow defaults

Confirm with claude --version. This page does not prescribe install flags or a multi-version migration path.

Related ops notes

For nearby Claude Code git/settings frictions, see Why does Claude Code keep asking permission for read-only git commands? and How do I turn off Claude Code commit attribution and the Claude-Session trailer?. Plugin hygiene after upgrades: How do I use Claude Code /skill-doctor?.

Freshness note (2026-09-18): CHANGELOG head is now 2.1.276. This fiche stays scoped to 2.1.271-2.1.272. Later releases are out of scope here unless they break these five operator standouts.

Sources (checked 2026-09-15; head re-checked 2026-09-18)

Claude Code CHANGELOG.md - 2.1.271 feature bullets (exact); 2.1.272 “Bug fixes and reliability improvements”
claude-news.today briefing 2026-09-15 - dated release framing
Intake note: CF prod matin radar 2026-09-15 recorded P0 interrupt No (no cascade).