Claude Code v2.1.271 Release Notes — What's New

What's changed

Added fast mode in Claude Code Remote sessions (cloud and self-hosted runners): the host's fast-mode setting or /fast typed in the session applies where your organization allows it
Added mouse support to the /config panel 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
Added claude self-hosted-runner --drain-marker-file <path>: when that file exists at a SIGTERM drain, the runner reports its exit to the server as a host drain (telemetry only)
Added per-command allowed_domains to Bash, PowerShell and Monitor in auto mode with sandboxing: the hosts a command needs are reviewed with it and opened for it alone; other hosts are refused
Added omitClaudeMd to agent frontmatter and --agents JSON, letting custom and plugin subagents run without user, project and local CLAUDE.md files; managed policy files still load
Added --accept-command <sha256> to claude plugin install and claude plugin update to accept exactly the command a previous --json run displayed, instead of -y
Added support for a multiplier above 1, up to 10, in the modelPricing managed setting and the Claude apps gateway pricing block, for marked-up internal chargeback rates
Added a spinner tip pointing Bedrock, Vertex AI, Foundry and LLM gateway users to the Claude desktop app; the claude.ai desktop app tip now suggests /desktop, which offers to download the app
Fixed a cached organization policy being reused after switching accounts, organizations, or API keys, and the policy not refreshing until the hourly check when the credential changes mid-session
Fixed the tool and command lists not updating when the organization policy finishes loading after startup or changes mid-session
Fixed an enterprise managed-mcp.json that can't be read or parsed being ignored: it now keeps exclusive MCP control (user, project and plugin servers don't load) and warns at startup
Fixed org policy being fetched through, and rejected by, third-party local proxies set via ANTHROPIC_UNIX_SOCKET; they are again treated like other custom gateways, including for Remote Control
Fixed cloud sessions rejecting every subagent tool call ("updatedInput … failed schema validation") when a workflow or agent approval was applied after the session's worker restarted
Fixed /fast off answering "Fast mode unavailable" instead of turning fast mode off when the organization has fast mode disabled
Fixed sessions started with CLAUDE_CODE_SKIP_FAST_MODE_ORG_CHECK re-sending fast requests every turn after the API rejected fast mode; the rejection now stands and its reason is shown
Fixed fast mode under CLAUDE_CODE_RETRY_WATCHDOG failing the turn on a usage-credits limit, or retrying an overload at fast speed, instead of falling back to standard speed
Fixed Bash permission checks missing the file that fmt, column and similar commands read when it follows an option the checker doesn't recognize
Fixed Bash permission checks skipping files a wildcard expands to when the wildcard sits in a command's pattern or option value (for example grep -v dir/* file)
Fixed Bash permission checks so that shell variable declaration flags cannot misrepresent the command being run
Fixed Bash commands with two directory changes, a subshell, or a cd+git chain skipping the prompt under permissions.blockReadsOutsideWorkingDirectories in bypass and auto mode
Fixed a stale .git/config.lock breaking git checkout -b, git push -u and git config for the rest of a session after a sandboxed command failed to start (Linux)
Fixed settings file changes made outside the session going unnoticed on macOS machines whose system file-event service is saturated; the watcher now falls back to polling
Fixed resumed claude -p sessions whose tools all come from MCP servers failing with "At least one tool must have defer_loading=false"
Fixed turns failing with "API returned an empty or malformed response" when an LLM gateway returns the non-streaming reply as text/plain
Fixed sustained high CPU usage and repeated tool-list requests when an MCP server sends list_changed notifications in a tight loop
Fixed MCP OAuth mishandling client registrations: denying consent forced a new one, one for another redirect URI was reused, and a concurrent write could delete a valid one or keep a mismatched one
Fixed tool search returning no match when Claude selects an MCP tool by its bare name instead of its full mcp__server__tool name
Fixed Ctrl+O cancelling pending MCP server reconnects, and /mcp sent from Remote Control failing while the transcript view is open
Fixed the Claude in Chrome prompt telling the model to load tools through ToolSearch when ToolSearch is unavailable
Fixed cross-session messages held by the receiving session's permission-mode policy leaving no trace: headless senders now get a delivery notice, and SendMessage results no longer imply it was read
Fixed Claude starting a second copy of a background command (such as a watch task or dev server) that was still running after the conversation was compacted
Fixed /model warning about losing the conversation cache when switching back to the model the conversation actually ran on
Fixed /reload-skills reporting a skill count that disagreed with the slash menu after /cd
Fixed /resume and /continue showing only 1-2 sessions in fullscreen mode on short terminals
Fixed /resume and /teleport keeping the previous conversation's file-read tracking, so Claude could edit files the resumed conversation had never read
Fixed --resume dropping the 1M context window ([1m]) when the resumed session's model family differs from the configured default model
Fixed artifacts attached with /artifacts disappearing from the session after --resume
Fixed background sessions (claude --bg, claude agents) not watching the artifacts they publish for republishes made elsewhere
Fixed custom agents, slash commands and output styles beyond the first not loading from a virtual drive that reports inode 0, such as an encrypted vault mounted as a Windows drive
Fixed self-hosted runner sessions silently losing all host config (settings, skills, plugins, MCP servers) when the host config directory exceeds 64 MiB; added --host-config-snapshot disk|memory
Fixed skills synced from claude.ai staying on disk indefinitely after signing out; copies not refreshed within cleanupPeriodDays now move to the recoverable trash at the next launch
Fixed spinner tips suggesting commands that aren't available for your account type or are disabled in your session
Fixed the /add-dir path input: the left and right arrow keys now move the cursor, and Enter adds only the typed path instead of also adding the highlighted completion
Fixed text fields outside the main prompt moving a leading ! to the end of what you typed (!foo came out as foo!)
Fixed the interactive /hooks menu crashing when a hook matcher is named after an inherited object property such as __proto__ or constructor
Fixed a fullscreen rendering glitch where text kept a stale background color after the box around it lost its background
Fixed Delete in st and Alt+arrow keys in rxvt-unicode not working in attached background sessions
Fixed the terminal's replies to capability queries (^[[?1;2c) appearing at the shell prompt or in an editor when Claude Code exits, is suspended, or opens an editor right after starting
Improved terminal rendering performance: large diffs and long transcripts render faster, with fewer slow frames
Improved startup time slightly by skipping a redundant validation of built-in model data on every launch

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