You can now name backup models in the new accessFallbackModels setting, for use when the main model can't be used. A new per-server disableAutoBackground option stops Claude Code from moving that MCP server's tool calls to the background. In remote sessions, CLAUDE_CODE_HOST_SKILL_CATALOG can list which skills are allowed to load. Setting CLAUDE_CODE_ARTIFACT_PREVIEW to false now turns artifact preview off. A new Publish plugin tool sends a plugin to your organization's library after you confirm. Organisations under the HIPAA policy are blocked from publishing plugins this way.
Several features are in the build but not switched on yet. An option for screen-reader users to move through suggestions with the arrow keys is built but held behind a remote switch that is off. WebFetch can ask about blocked URLs one prompt at a time, but only once a server switch is turned on. An emulator engine for artifact previews in remote sessions is built but cannot be selected yet. Plugin rating now also needs a server switch, and that switch defaults to off. Pressing Enter on a slash-command suggestion can run only the one you picked with the arrow keys, once that behaviour is switched on.
Composed characters and IME typing are no longer dropped from the prompt. In vim mode, h and l now stop at the start and end of a line. The vim f, t, F and T searches now stay on the current line. The ; and , keys now repeat the last vim search even when the character was not found. Web search in remote sessions no longer skips the proxy when web fetch is disabled. A slow-starting local MCP server is no longer wrongly remembered as an older server after a timeout.
Written by our agent from the shipped bundle, not by Anthropic.
A new CLAUDE_CODE_HOST_SKILL_CATALOG variable lets a remote session's host name which skills to load, from a new host catalog at /mnt/skills/public
SDK results gain a safety_stops count, interrupts gain an internal worker_epoch, and turn handoffs can carry server-side safeguard verdicts
Sessions now reject every poll event unless the host set CLAUDE_CODE_POLL_EVENTS, and own-events-only remote sessions stop advertising session notices
The CLAUDE_CODE_REPO_CHECKOUTS lookup moves into a new accessor, and the workspace diff scan now returns which repo root it uses and whether it follows the shell
Sessions & agentsA new accessFallbackModels setting lists models Claude Code may fall back to when the main model can't be used
Sessions & agentsWant the reasoning? Read walks the 51 entries that probably matter to you, each one opening to what changed and why.
Read this release → Every row →Anything you can use today, anything that visibly changes, and anything worth poking at. One line each, open for detail.
Sessions now reject every poll event unless the host set CLAUDE_CODE_POLL_EVENTS, and own-events-only remote sessions stop advertising session notices
When a proactivity level would start auto mode, Claude Code now holds it and shows a notice if your organization's policy has not loaded
What would fix it?
Smaller changes and internals, grouped as the pipeline found them. Nothing is dropped, it is only further down.
8 more of these are in What probably matters to you, above.
In remote sessions, a permission request left unanswered long enough can be declined automatically, with Claude told not to retry
Unclear Whether a built-in waiting time of 0 leaves this off unless it is set remotely is not confirmed.
Claude Code no longer removes outdated managed or duplicate plugin entries unless it can use plugin-directory-bindings.json, and it now warns when it keeps them
Ultrareview now passes bundleFollows for branch reviews, and a missing preflight response can block the launch instead of letting it proceed
Unclear The condition that decides whether the launch is blocked is not identified.
Stdio MCP servers now use automatic protocol negotiation unless a server-side setting explicitly turns it off
Claude's Bash instructions now give background commands a default timeout of 600000 ms (10 minutes), down from 1800000 ms (30 minutes)
Unclear It is not settled whether background commands are actually stopped sooner, or whether only the wording Claude reads has changed.
Claude Code can refuse to send an MCP task to the background, and end it, when too many were started since you last wrote
Unclear The limit and whether this check is switched on are not stated.
When a tool needs you to interact with it, Claude Code's own permission decision now overrides a plugin's tool.check hook
Project uploads from a local path now refuse credential files, devices, Claude Code's own config, hard-linked files and files you are not allowed to read
An MCP tool whose name is longer than the API allows is no longer sent to Claude, and Claude Code logs a warning for that server
A stdio MCP server that answers the protocol probe late is no longer remembered as old-protocol, and stdio servers now get a hashed identity
On Linux, Claude Code now refuses a file read if the system cannot say where the opened file really is
An agent definition file whose name is longer than the maximum allowed is now skipped and an error is logged
Unclear The maximum allowed name length is not stated.
Resuming a skill that runs as its own agent is refused when your organization's Skills setting turns it off; slash names must match exactly one command
Unclear Which commands the new check leaves out of the skill list is not stated.
A skill, agent or command whose name is longer than 256 characters is now rejected with an error
Most claude plugin commands now wait for remote managed settings to load and do not run if those settings are not approved
Unclear It is not clear in which situations Claude Code waits, so it is unknown whether every reader is affected.
Once too many MCP tasks have moved to the background since you last wrote, new ones are cancelled and Claude is told no result will follow
Unclear The size of the limit and whether this behaviour is switched on for everyone are not known.
Negotiating the protocol version with local stdio MCP servers now falls back to on, and a broken record of past probes is ignored rather than trusted
A name in a skill or agent file's frontmatter longer than a set limit is now rejected or ignored with a warning
Unclear The maximum name length is not shown.
Claude Code now refuses to resume a skill agent whose skill your organization's Skills setting turns off, not only synced ones
Published verbatim by Anthropic for v2.1.292. Text is unmodified from the upstream changelog. Everything else on this page came out of the bundle instead, which is why the two lists don't match.
Of these 92 bullets, 14 name something an entry on this page also names, 25 name something no entry here does, and 53 name nothing specific enough to line up either way. The pairings are made on names both sides wrote down, a flag or a setting or a slash command, so read one as probably the same thing rather than as a fact, and read the middle number as candidates rather than as a miss count.
--marketplace <source> to claude plugin install: adds the marketplace if needed, under the same policy checks as claude plugin marketplace add, then installs the plugin from it
Probably marketplace-argument-validation-for-plugin-install, claude-plugin-install-marketplace-flow-added-only-the-fun effort parameter to the Agent tool, so Claude runs a sub-agent at the effort level you ask for
Nothing to match on CLAUDE_CODE_OVERLOADED_RETRY_BASE_DELAY_MS environment variable to set a longer base delay for the backoff when retrying an overloaded (529) request
No entry names this prompt.autocomplete, an event a mod hooks to add its own rows to the prompt box's autocomplete list
Probably prompt-cache-relay-message-and-commandrun-annotation, new-ui-prompt-autocomplete-control-request-for-remote-compos, new-plugin-hook-event-promptautocomplete, plugin-hook-table-gains-promptautocomplete-validator-treat, new-promptautocomplete-hook-surface-plugin-supplied-rows-u $.model.complete for mods: prompt and system take blocks of text, and cache: true on a block caches the request up to it
Probably hooks-modelcomplete-accepts-cached-promptsystem-blocks agent.spawn mod hook, with their run and index, so a mod can refuse them
No entry names this permissionMode: auto entering auto mode when auto mode is unavailable (disabled by settings, circuit breaker, or a model that doesn't support it)
No entry names this /ultrareview uploads under ~/.claude/seed-admin
No entry names this rm -rf on the 8.3 short name or another alternate Windows spelling of the home folder or a drive not being treated as removing it
No entry names this #99193[BUG] Windows: sub-agent rm -rf on the 8.3 short-name alias of the home dir wiped ~116 GB; TaskStop left it running ~50 min; agent reported 'looks intact' (related: #92593, #95426, #97660) Open
#99198[CRITICAL] Sub-agent ran `rm -rf` on the user's Windows home directory (via 8.3 short name), no hard guard; delete kept running after the task was stopped Open
allowed-tools rule coming back in a later turn when you leave auto mode or plan mode partway through that turn
No entry names this NO_PROXY being ignored for Claude Code's own API requests (sign-in, policy, feedback, artifacts) when HTTPS_PROXY is set
No entry names this claude plugin commands such as marketplace add and install running before an organization's managed settings had loaded on a first run
Probably plugin-commands-wait-for-remote-managed-settings-before-runn, plugin-remove-explains-blocked-legacy-local-settings-file, marketplace-argument-validation-for-plugin-install, claude-plugin-install-marketplace-flow-added-only-the-fun claude -p and Agent SDK runs stopping a background command 5 seconds after the final result, and one-shot claude -p runs dropping a scheduled wakeup; both are now waited for
Probably print-mode-can-hold-open-for-background-shells-before-the-ce #86447[BUG] Print mode (-p --output-format stream-json): session ends with result: success while background tasks are running and a ScheduleWakeup is pending — scheduled wakeup can never fire, background tasks are killed Duplicate
claude --resume session picker or with /resume
No entry names this #89463Plan mode indicator vs. enforcement desync when resuming a conversation that was in "edits on" Open
/resume, /branch or /clear never firing, and saved tasks ignoring later creates and deletes after two writes to the tasks file milliseconds apart
No entry names this #98219Durable scheduled tasks (CronCreate `durable: true`) never fire after an in-app `/resume` Open
/loop silently stopping when the session's process restarted (for example after a crash), because its pending wakeup was lost
Probably loop-wakeup-scheduling-tracks-tooluseid-and-chain-start, cronloop-tasks-can-fire-after-input-closes-while-waiting-fo pages was a list such as "6,9,15"; it now returns an error saying to read each page or range separately
No entry names this /bug, /share and /feedback <text> starting over after Ctrl+O or Ctrl+Z while a report was being sent, and closing as cancelled after it had been sent
Probably feedback-now-tracks-send-state-and-shows-a-submittingdone, safeguard-flagged-message-text-now-drops-a-sentence-for-some /remote-env replacing your saved default environment when you pressed Enter right away: the list now opens on your default, and no row has a check mark when no default is in effect
No entry names this f/t/F/T/;/, jumping to, or deleting up to, a match on another line of the prompt
Nothing to match on /add-dir path box letting Shift+Enter or a paste add a line break, and treating fast-typed "tab", "up" or "down" as those keys
No entry names this ! leaving the row selected
Nothing to match on /cd or a permission change, and added a transcript line when a nested one isn't loaded
No entry names this /name letting Claude invoke a skill that is reserved for the user
No entry names this $.state calls through one const taking minutes to load or validate
No entry names this claude plugin validate listing a matcher or state value for a hooks module that the engine reads from elsewhere
Probably plugin-commands-wait-for-remote-managed-settings-before-runn claude plugin validate listing a $.state value read through a top-level var that was declared again or reassigned; such a module is now refused
Probably plugin-commands-wait-for-remote-managed-settings-before-runn $ method restarting the hook origin, which could run a guard hook with a .catch above it again without end
Nothing to match on config.set, state.set, env.set or agent.spawn hook that denies after calling next(e) being answered as a refusal: the hook is now reported as failed, by name
No entry names this /theme, the /config Theme menu and the first-run theme step saving a theme before a plugin's config.set hook was asked
No entry names this tool.check hook answering allow running a tool that requires your answer (a question, a plan approval) without showing its dialog
Probably tool-check-hooks-can-no-longer-override-tools-that-require-t, plugin-toolcheck-and-uiscroll-wait-on-pending-work-first next(e) and then failed while the turn was interrupted letting the call through; the call is now rejected
No entry names this $ name that a user-installed mod had added; the mod is now unloaded instead
Nothing to match on tool.call hooks seeing some tool calls before misnamed parameters were repaired; a hook now sees the arguments the tool will run with
No entry names this .catch being skipped silently for calls another mod's hook makes beneath the guard's own $ call; its .catch is now asked
Nothing to match on claude -p and SDK sessions: the first turn no longer waits for HTTP and SSE MCP servers to answer resources/list
Probably print-mode-can-hold-open-for-background-shells-before-the-ce <system-reminder> tags written in a hook's output are escaped before they reach Claude
No entry names this file_path for path, and Write, WebFetch and Read ignore a few stray parameters instead of failing the call
Probably search-tool-accepts-file-path-as-an-alias-for-path, artifact-preview-tool-wording-differs-in-emulator-mode FOO=bar python3 app.py runs unprompted
No entry names this MCP_PROTOCOL_NEGOTIATION=legacy opts out
No entry names this claude plugin test: a failed expect inside a hook the test registered, or a stub answer the engine refuses, now fails the test instead of passing silently
Probably plugin-commands-wait-for-remote-managed-settings-before-runn name longer than that is ignored
Nothing to match on @Claude !status in a channel to say when Claude has stopped reading its untagged messages, why, and that an @-mention starts it reading again
No entry names this !fork to a card showing where it came from, the request, and who asked, with a link to the original thread
Nothing to match on A model matched these bullets to the GitHub issues they fix, so a link can be wrong.
1 of 25 tool schemas changed.
Claude Code, interactive mode
11 prompt changes in this release could not be quoted from the build, so no entry on this page describes them.
495 documentation changes were recorded within 24 hours either side of this release, nearest first. The closest 12 are below. They're here because they happened near this release in time. That's not a claim that this release caused the edit, or that the page documents anything in it.
The 59 literal strings found in the bundle, with the number of entries that name each one. Picking one searches for it. A name is here because this build's code mentions it, which is not the same as it working or being finished.
What's wrong with this entry?