Claude Code v2.1.321 发布：新增 Claude Fable 5.2 为默认 Fable 模型

What's changed

• Added Claude Fable 5.2 (claude-fable-5-2), now the default Fable model — 1M context, $8/$40 per Mtok with $0.20/Mtok cache reads
• Added --settings <file> to claude remote-control, which applies a settings file to every session it starts; if the file changes, no new session starts until you restart claude remote-control
• Fixed MCP OAuth requests sending secrets such as refresh tokens to another host when a server redirected them
• Fixed a case where a read-only Bash command ran outside the sandbox without a permission prompt
• Fixed a case where Bash permission checks judged a file write from the wrong folder and didn't prompt
• Fixed deny rules and protected-file prompts not applying to the file that a cp or mv into a directory writes
• Fixed the "Draws from usage credits" note showing after a switch to Fable on Enterprise seats whose plan includes Fable
• Fixed the fallback model sometimes declining a request or mentioning a stopped response when the first model was blocked before replying
• Fixed claude mcp login printing a SEP-2352 issuer warning each time you sign in again to a server that Claude Code registered with
• Fixed NotebookEdit deleting or overwriting a notebook's first cell when the call named no cell, on network paths (UNC shares, WSL folders, /net mounts)
• Fixed Edit changing the first of several matches, replacing a whole file on an empty old_string, or editing a notebook as text, on network paths (UNC shares, WSL folders, /net mounts)
• Fixed /config showing Manual as the default permission mode when new sessions start in auto mode; pressing Space on "Auto (default)" now saves Don't Ask, not Plan
• Windows: Fixed FileChanged hooks stopping for paths set through watchPaths after the first shell command, when the session's working directory had a lowercase drive letter
• Fixed --plugin-dir . and --plugin-dir ./builtin writing generated type files for Claude Code's built-in plugins into a builtin folder
• Fixed context usage estimates overcounting tool definitions when exact token counts are unavailable
• Fixed /compact showing twice in Remote Control on web and mobile
• Fixed plugin auto-updates and /plugin marketplace updates downloading a plugin again for each worktree or folder of a repository
• Fixed auto mode losing a background subagent's report that had started a turn when the conversation was compacted before Claude answered it
• Fixed project skills, commands and agents staying missing after their folder was removed and came back mid-session, such as with git stash, including after entering a worktree
• Fixed claude -p sometimes telling Claude that background commands get 30 minutes when they are stopped after 10
• Fixed pkill, pgrep and pidwait in cloud sessions matching the session's own parent processes
• Fixed Claude in Chrome and computer use server processes staying alive after their parent exits behind a proxy that stalls connections
• Fixed a large hook output pointing Claude to a file that held another hook's output from the same tool call
• Fixed apps that embed Claude Code getting their own PreToolUse hook's ask reason instead of another hook's when both asked
• Fixed a PreToolUse hook's ask being lost when another hook's defer finished first and could not be honored
• Fixed a rare crash on permission prompts and background tasks
• Fixed project skills, commands and agents disappearing from the menu in SDK and desktop sessions after Claude entered a worktree
• Fixed /desktop on macOS saying Claude Desktop is not installed when it is in ~/Applications
• Fixed OpenTelemetry repository attributes (vcs.*) missing from Claude Desktop sessions that start on a pre-started process
• Fixed WebFetch passing "No response from model" to Claude as page content when the model reading the page returned no text; the call now fails with a clear error
• Fixed screen reader mode delaying the prompt at startup when the system clock moved back while Claude Code was starting
• Fixed a command's panel sometimes not coming back after a dialog closed, leaving no panel or prompt on screen until the next redraw
• Fixed a project's MCP server being disconnected after the first message in a Claude Desktop Code tab session when the desktop app has an MCP server or extension of the same name
• Fixed a turn ending with "API Error: EPROTO: The TLS handshake failed" when the connection broke partway through a reply; the partial reply is kept or the request is retried, as before 2.1.302
• Fixed high memory use in long sessions that repeatedly read single lines from large files
• Fixed fast mode losing replies, switching models or retrying for minutes when fast serving is rate-limited, overloaded or failing; it now tries standard speed on the same model first
• Fixed one request carrying far more background agent reports than intended after Claude was stopped while several were waiting
• Fixed messages from a Claude Desktop Code tab session to your other sessions staying paused after you typed while Claude was still working
• Fixed claude agents ignoring --permission-mode, --dangerously-skip-permissions, --model, --effort or --agent typed before agents when a flag such as --verbose was also on the line
• Fixed a case where Remote Control showed as off with "login expired" in the desktop app while its connection was still up, because the app was briefly unable to hand over a sign-in token
• Fixed a Remote Control message sent with "Queue for later" reaching Claude in the middle of the running turn
• Fixed the git status given to Claude at session start reading as clean when git status failed; it now reads as unavailable
• Fixed the git status given to Claude at session start showing the first listed file as staged when its changes were not staged
• Fixed a hang or out-of-memory crash when a connector in a cloud session lists resources with very long names
• Fixed Remote Control showing as connected after its connection closed for good while the session's history was still uploading
• Fixed screen reader mode turning off when you return to a conversation from agent view
• Fixed screen reader mode y/n questions taking as yes a stray "y" at the end of text typed as the question opened
• Fixed cloud sessions telling Claude that a host is probably not allowed when it is allowed and the network proxy could not connect to it
• Fixed an MCP server sometimes showing as connected with no tools after it was reconnected or the session's directory changed while its tools were still loading
• Fixed Bash commands sometimes running in the wrong folder when Claude sent several at once and an earlier one changed folders
• Fixed files Claude sends from cloud and Remote Control sessions failing at once when an upload gets an HTTP 507 from a proxy; the upload now gets a second try
• Fixed new messages not being saved, and claude -p, SDK and VS Code sessions hanging, when memory ran out while the transcript was being read
• Fixed sign-in, token refresh and logout waiting indefinitely when something on the network accepts the connection but never answers the TLS handshake
• Fixed a sent file showing under a different name in the Claude apps when its name hid text-direction or control characters; Claude now refuses to send such a file
• Fixed sub-agent progress summaries running a request to its end after the model replied with a tool call
• Fixed Bash reads such as grep -r foo "$PWD/src" asking for permission when the same command with the path typed out runs without asking
• Fixed Claude apps gateway refusing to start when a desktop setting holds a field newer than the gateway, such as a managed MCP server's oauth.omitResource; it now warns and serves it
• Fixed Bash commands coming back empty for zsh users whose .zshrc sets KSH_OPTION_PRINT
• macOS: Fixed "Unable to read managed policy settings" at startup when a valid MDM profile was slow to read: the read is retried once, and a timeout is now reported as a timeout
• Fixed agent view erasing another agent view's saved input text when it restarted for an update with nothing typed
• Fixed remote sessions giving no reply after a restart when a UserPromptSubmit hook blocked a replayed permission answer; these hooks no longer run on that replay
• Fixed claude remote-control accepting a y typed without Enter at its first-run question when the terminal's input ended
• Fixed Claude Desktop not showing spend limit warnings behind a Claude apps gateway whose policy has no code: rules
• Fixed fullscreen sessions with some plugins ending with an error when a tool result that had got shorter scrolled off the top of the screen
• Fixed prompt suggestions making extra API requests when the model replied with a tool call
• Fixed PreToolUse mcp_tool hooks on stdio and HTTP MCP servers being skipped when their answer was over 16 MiB; the tool call is now refused
• Fixed skill and command names holding a Bamum letter that some fonts draw as blank: they are now refused
• Fixed claude -p on Linux exiting 0 in silence when a full NFS export or a used-up NFS quota lost transcript lines: it now prints an error and, in text and json output, exits 1
• Fixed background agents being reported as stopped by the user, and refused a resume, when a service interrupted a cloud session and nobody pressed Stop
• Fixed NotebookEdit reporting success to hooks and telemetry when the edit failed, for example when the notebook changed while the permission prompt was open
• Fixed a blank screen or no answer at startup, and empty claude mcp list output, when a stored MCP sign-in record was null
• Fixed the Artifact tool telling Claude to add filters when an artifact's database collection is too large to sort; it now says to read the collection page by page and sort the results
• Fixed a restarted cloud session dropping a message with a large image when the restart came before Claude's first reply to it
• Fixed a restarted cloud session leaving a subagent's message to the main conversation unanswered
• Fixed Claude not being told when you stop or pause a running workflow, so it no longer says the workflow is still running
• Improved the /model picker: "More models" is now an unnumbered row below every other, and older models open under it without renumbering the rest
• Gateway: Improved spend limits on a busy replica, which now skips fewer checks and records spend sooner
• Improved the Claude apps gateway's sign-in limit messages in Claude Code and on the /device page: they no longer name gateway settings, which the gateway's own log still names
• Improved claude install and the install scripts: they finish 2 to 4 seconds sooner
• Improved how soon a Remote Control session whose process crashed can pick up a new message
• Windows: Improved startup and first-command time by finding programs on PATH without starting a helper process
• Improved auto mode in headless sessions, the desktop app and VS Code: reports from background subagents that wait together are answered in one model call, as in the terminal
• Improved the agent view's row for a claude --bg --worktree session that couldn't set up its worktree: it now shows the error from its beginning, not an internal tag or its last 200 characters
• Improved the messages shown when an artifact is in another organization: /login is offered only if it's one of yours, and Claude now says where a copy may be after an account move
• Improved sessions with more images than fit in one request: Claude is told whether it has already seen a dropped image, and repeat reads of an unchanged image are limited
• Improved claude remote-control's messages for an unanswered first-run question: each now says what to do next
• Improved start-up time by loading trusted TLS certificates faster
• Improved Claude apps gateway error messages to show the gateway's address without any user name or password
• Improved the Claude apps gateway's spend limit error: the reset now shows in your local time, such as "resets 4pm (America/Los_Angeles)"
• Windows: Improved startup time with a standard Git for Windows install by no longer checking which git.exe to run on every launch
• Updated the session-feedback message and the allowedProviders setting description to name Ultra alongside Pro and Max, and the forceLoginMethod description to cover every paid Claude plan
• Updated the bundled dataviz skill to suggest a list of meters, one row per item, for several ratios that each have their own limit
• Updated the "Upgrade to Max" options to say "Upgrade to Max or Ultra"
• Changed mods Claude writes to turn on without asking in auto and bypass modes, even with managed allowUnsandboxedCommands: false or allowManagedDomainsOnly, and not to load in dontAsk mode
• Changed mods' own tool calls ($.tool.call, $.mcp.call) to raise no permission prompt, even under your own ask rules or in dontAsk and -p runs; deny rules and organization policy still apply
• Changed saved Fable 5.1 model picks to move to fable: on Pro and Max plans at once, on Team and Enterprise plans once your organization allows it; use /model claude-fable-5-1 to switch back
• Changed the fast mode labels in /fast, /config and /model to name your current model when it supports fast mode, and removed "(Opus only)" from the VS Code row
• Changed nested skill loading: .claude/skills folders inside ~/.claude/plugins no longer load when Claude works on files there
• Self-hosted runner: Changed an on-demand runner that the server refuses because it is not needed (session ended or paused, work order superseded) to exit 0 instead of 1
• Windows: Changed how Claude Code finds programs it starts itself, such as git, to skip relative and UNC PATH entries and links onto a network share, and to pick up PATH changes from settings
• Changed OpenTelemetry hook events in non-interactive sessions to leave two built-in hooks out of num_hooks and num_success after Bash and PowerShell calls
• Changed the number of messages a Claude Desktop Code tab session can send to your other sessions before it waits for you to type again from 10 to 20
• Changed AskUserQuestion in claude -p and SDK sessions to deny a host's permission answer that sets the undocumented afkTimeoutMs input field
• Changed managed extraKnownMarketplaces: a declared name can't be added from another source, an entry from elsewhere is hidden, and plugins the declared marketplace lists are reinstalled from it
• Changed Claude in Chrome tools that an app running Claude Code provides, such as the Claude desktop app's Code tab, to follow your organization's Claude in Chrome policy
• Changed policy_mode: layered in the Claude apps gateway: managed MCP servers now add up over every matching policy, match: {} included, so a gateway already on it serves more after the upgrade
• Gateway: Changed Bedrock, Vertex and Foundry upstreams to ignore the ANTHROPIC_*_BASE_URL variables in the gateway's environment. Set base_url on the upstream to use another endpoint
• Changed headless sessions to reload mods in .claude/skills when their files change; set CLAUDE_CODE_PLUGIN_DIR_WATCH=0 to turn this off
• Changed the Cyber Verification Program sentence on a cyber safeguard block to use the same words as claude.ai
• Changed Cowork cloud sessions: a PostToolUse hook can no longer replace the answer to AskUserQuestion or the plan in ExitPlanMode's result; Claude reads the originals
• Changed cp and mv spelled by a path, such as /bin/cp, to get the same path checks as cp and mv
• Changed background command notifications and TaskStop results to show Claude only the start and end of a command over 1,000 characters, which saves context
• Changed artifact design guidance to treat Inter and Space Grotesk as good default typefaces
• Changed the account email check to refuse only a shell command that holds your email and names a User-Agent, without asking, so other commands and scheduled runs no longer stop at its prompt
• Changed Remote Control sessions to keep the folder they were started in: a connected client can no longer move a session to another folder
• Changed managed extraKnownMarketplaces take-overs from an undeclared source: saved data is set aside for cleanupPeriodDays, and options and secrets until claude plugin restore-set-aside
• [VSCode] Added a warning above the prompt box when both an auth token and an API key are set, matching the terminal's startup warning
• [VSCode] Fixed a plugin's permission request showing a name with hidden characters: it now reads "a plugin"