Claude Code

What's changed

• Added Claude Haiku 5.5 (claude-haiku-5-5), now the default Haiku model on the Anthropic API — 1M context, $0.10/$0.50 per Mtok ($0.50/$2.50 for prompts over 100K)
• Added agentType to the subagentStatusLine payload, so scripts can tell custom subagent types apart
• Added isDeferred to $.tool.register for mods: false lists the tool's schema in the prompt from the start instead of behind tool search
• Fixed Claude sometimes treating its own last actions before a context compaction as done after it, and retracting or redoing finished work
• Fixed a memory leak where an HTTP MCP connection kept every request it had sent until it closed
• Fixed a message sent while Claude was working being lost when ← moved the session to the background; if a queued message can't move, ← now stays put and says so
• Fixed /model effort ←/→ wrapping past the highest or lowest level, which could accidentally save Low as a model's default effort
• Fixed /tui disconnecting Claude in Chrome in a session started with --chrome, and ignoring --no-chrome

What's changed

• Added --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
• Added an effort parameter to the Agent tool, so Claude runs a sub-agent at the effort level you ask for
• Added CLAUDE_CODE_OVERLOADED_RETRY_BASE_DELAY_MS environment variable to set a longer base delay for the backoff when retrying an overloaded (529) request
• Added prompt.autocomplete, an event a mod hooks to add its own rows to the prompt box's autocomplete list
• Added prompt caching to $.model.complete for mods: prompt and system take blocks of text, and cache: true on a block caches the request up to it
• Added workflow agents to the agent.spawn mod hook, with their run and index, so a mod can refuse them
• Fixed subagent definitions with permissionMode: auto entering auto mode when auto mode is unavailable (disabled by settings, circuit breaker, or a model that doesn't support it)
• Fixed sandboxed commands being able to read the staged file copies of /ultrareview uploads under ~/.claude/seed-admin

What's changed

• Added serverToolUses to the result of a mod's turn.step hook: the tool calls the API ran itself (the advisor), each with its id, name, input, start and end
• Added agentId to the tool.check event of plugin hooks, so a hook can tell a subagent's permission check from the main session's
• Added ceiling to the question and verdict a mod's tool.check hook reads, naming the approval an organization requires for a tool
• Added ThemeKey and Color types to the plugin hooks typings, so an editor lists the theme colors a mod's drawing can name
• Added to claude plugin validate: each hook a mod registers at a gating site is listed with whether it has a .catch (gatingHooks under --json)
• Added a Deny button to the Claude apps gateway's sign-in approval page: it ends the pending sign-in, so the waiting terminal stops within seconds
• Added claude attach <name> and claude logs <name>: part of a session name works in place of the id
• Added /claude-api managed-agents-onboard <url> to set up the Managed Agents pattern a page describes as ant apply files

What's changed

• Fixed a deny or ask rule on a nested part of a compound shell command not holding over a user-installed mod's approval on managed machines
• Fixed the terminal freezing on short code blocks with many unclosed <script> tags or deeply nested ${ substitutions
• Fixed Read deny rules not applying to files @-mentioned, changed, or selected in the IDE through a symlink
• [VSCode] Reverted a 2.1.288 change to claude auth status that may have made sign-outs more frequent
• Improved how quickly large files open in a plugin code pane by laying the highlighted view out once at its final width
• Fixed plugin list, plugin eval and plugin update showing a stale copy of a plugin installed from a local folder marketplace, and hot reload for a symlinked --plugin-dir
• Fixed installed mods not loading in the first session after an upgrade
• Fixed a plugin's rows above the prompt showing a stale row while the Background tasks dialog was open in fullscreen
• Fixed plugin panes drawing nothing when a link used a localhost address, an @ in its path, an uppercase host or a file: path

What's changed

• Added $.ui.selection() for mods: returns the text you last selected in fullscreen mode and, when the selection lies within one transcript row, that row
• Added a built-in gh api to cloud sessions whose image has no GitHub CLI, and fixed the built-in sending control characters from file names, jq filters or GitHub errors to the terminal
• Added recovery for a prompt cleared with Ctrl+C: pressing Up on the empty prompt brings the draft back, including pasted text and images
• Added a re-authenticate prompt when an MCP server asks for more OAuth scope during a tool call
• Added --max-findings <n>|all to /code-review to report more or fewer findings than the usual limit; the choice is reused until you pass --max-findings default
• Added Ctrl+F to find a session by name and Alt+↑/↓ to jump between groups in the agents view; both, and rename, can be rebound in keybindings.json
• Added a screen reader mode announcement of the new permission mode when you approve a plan, including with Shift+Tab

What's changed

• Added Claude Mods: plugins may now modify deeper behavior

• Added You should know, a built-in mod where a side agent watches your back and flags things you or Claude might miss. Turn it on with /plugin enable cc-plugin-you-should-know@builtin (for first-party sessions with telemetry on)

• Added an n:<text> filter to the agents view that matches session names and tasks; a filter now shows matches in collapsed sections and Enter opens the first match

• Added prompt_text to the OpenTelemetry user_prompt event, a copy of prompt for backends that nest dotted keys; drop or mask it wherever you drop or mask prompt (anthropics/claude-code#70763)

• Added URL prompts from MCP servers on the 2025-11-25 protocol, for example to sign in. If a server no longer connects after this update, add "bareElicitationCapability": true to its MCP config entry

• Windows: Added a startup warning when denying the Bash tool also turns off the PowerShell tool, so Claude has no shell tool

• Self-hosted runner: Added a built-in gh api (REST only) for sessions that use Anthropic-managed git on macOS and Linux machines where the GitHub CLI is not installed

What's changed

• Added a count such as "2 of 5" to the permission prompt when several permission requests stack up
• Added mouse support for the "N more" rows of lists in fullscreen mode: click one to jump to that end of the list, with hover and pressed states
• Fixed several Claude Code processes and IDE extensions each opening a login browser when gcpAuthRefresh or awsAuthRefresh credentials expire
• Fixed claude --resume and --continue sometimes losing every turn after a batch of parallel tool calls when the earlier session crashed or was killed
• Fixed API 400 errors after a tool or hook returned an object, number or boolean instead of text, including in resumed sessions
• Fixed cloud sessions with very large histories never waking up because the container was stopped while the transcript was still loading
• Fixed the Claude apps gateway's spend meter pricing 1-hour prompt cache writes at the cheaper 5-minute rate, and counting only the first model call's input tokens on streamed turns that run a server-side tool such as web search

What's changed

• Added CLAUDE_CODE_DISABLE_WEB_FETCH environment variable to turn off the WebFetch tool
• Added claude --desktop to open the Claude desktop app on the current directory, or on a session with --continue / --resume <id>
• Added claude plugin configure <plugin> to show a plugin's options and which are unset, or save new values read from stdin with --values-stdin
• Added <server>.<key>=<value> to claude plugin install --config, so a bundled .mcpb MCP server's own settings can be set at install time and it starts without visiting /plugin → Configure
• Added allowedProviders managed setting to limit which API providers a machine may use (Anthropic API, a custom endpoint, Bedrock, Mantle, Vertex AI, Foundry, Claude Platform on AWS, or a Cloud gateway)
• Added CLAUDE_CODE_NONSTREAMING_TIMEOUT_RETRIES environment variable to cap re-sends of a non-streaming fallback request that timed out
• Fixed claude -p with CLAUDE_CODE_FORK_SUBAGENT=1: a subagent's own Agent call now runs in the foreground, so the subagent gets the child's result

What's changed

• Added Claude Sonnet 5.5 (claude-sonnet-5-5), now the default Sonnet model on the Anthropic API — 1M context, $2/$10 per Mtok with $0.20/Mtok cache reads
• Added a "Yes, but ask again next time" answer to auto mode's prompt before a read outside the working directories, so you can allow that one read and still be asked about later ones
• Added dollar amounts to the Claude apps gateway spend limit in /usage and the status line (for example "$271.40 / $500.00 spent this month") when the gateway runs this version or later; the status line's rate_limits.spend_limit also gains used_usd, limit_usd and period
• Added effortSlider:decreaseEffort, increaseEffort and toggleUltracode keybinding actions, so the /effort slider's arrow and Tab keys can be rebound in keybindings.json
• Added /rate-limit-options to /help and the command menu for claude.ai subscribers, so the usage-limit notices that mention it point to a command you can find
• Added /mcp reconnect all in the interactive terminal to retry every MCP server that failed to connect or needs authentication at once

What's changed

• Added x-claude-code-prompt-id to the gateway hint headers so LLM gateways can group the requests that serve one user prompt; opt in with CLAUDE_CODE_GATEWAY_HINT_HEADERS=1
• Added availableModelsMatch managed setting: with "exact", an availableModels entry allows only the model version it names, so new releases stay blocked until listed
• Added deniedModels managed setting to block specific models, even when availableModels allows them
• Added MCP tool, WebFetch and WebSearch outputs to the tool.output OpenTelemetry span event when OTEL_LOG_TOOL_CONTENT=1
• Added /doctor prompt-audit (also /checkup prompt-audit) to audit your CLAUDE.md files, skills, agents and commands for prompting patterns written for older models
• Added click-to-expand for truncated messages from your other sessions in fullscreen mode
• Added path to --plugin-dir load-failure entries in the stream-json system/init plugin_errors, naming the directory that did not load
• Added an opt-in load_test_mode block to the Claude apps gateway config: requests are built and signed but not sent upstream, and clients get a canned reply, so a deployment can be load tested

What's changed

• Added a maxProseWidth setting that caps the width of Claude's prose in wide terminals while tables and code blocks keep the full width
• Added a startup notice, and /status and claude doctor entries, listing telemetry variables in a project's settings files that were ignored or that turned telemetry off
• Added the allowClaudeInChromeWithManagedMcp managed setting to let claude --chrome run alongside an exclusive managed-mcp.json; the error shown when Chrome is blocked now names it
• Added store.readiness_grace_seconds to the Claude apps gateway so /readyz can stay ready through a short Postgres outage such as a database failover
• Added a scrollbar to the /feedback drafts list in fullscreen mode; it appears while the mouse is over the list
• Fixed every request failing with a 400 error in conversations whose history holds web search results the API cannot decrypt (for example, from a turn answered through a third-party gateway)
• Fixed more cases of continued or resumed sessions (--continue, --resume) re-sending earlier messages in a changed form, which could make the API drop Claude's earlier reasoning

What's changed

• Added Claude apps gateway support for newer Claude Desktop keys in desktop policy blocks, including blockReadsOutsideWorkingDirectories and disableBypassPermissionsMode
• Added assume_role on Claude apps gateway Bedrock upstreams: the gateway calls Bedrock as an IAM role it assumes through STS, in another AWS account if needed, optionally one session per developer
• Added guardrail: {id, version} on Claude apps gateway Bedrock upstreams to apply an Amazon Bedrock guardrail to every request sent through them (set it on all Bedrock upstreams or none)
• Added telemetry.resource_attributes to the Claude apps gateway config, to put fixed labels on the telemetry of Claude Desktop and /login sessions
• Added "attribution": false in settings.json to hide all commit and PR attribution; older CLI versions skip a settings file that holds it, so keep the object form in files shared across versions
• Added MCP URL-mode elicitation on 2026-07-28 protocol connections, so servers can ask Claude Code to open a browser-based flow; no waiting dialog is left on screen when the server has no way to confirm completion

What's changed

• Added Claude Opus 5.5 (claude-opus-5-5), now the default Opus model — 1M context, $4/$20 per Mtok with $0.20/Mtok cache reads
• Added mouse support to more lists in fullscreen mode: the wheel scrolls the /skills list, and a skill's state options in /plugin can be clicked
• Added CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH to change the 2,048-character cap on MCP tool descriptions and server instructions for every MCP server in the session
• Added hook output sizes and the number of oversized outputs saved to a file to the hook_execution_complete OpenTelemetry event
• Fixed writes through a symlinked path being judged by their in-tree spelling: the prompt names where the write lands, and acceptEdits, allow rules and auto mode no longer approve one landing outside
• Fixed auto mode retrying an action over and over when a safety check declined to review it; the action is now denied once, noting that retrying won't help
• Fixed auto mode denying actions over and over without pause when a safety check gave no answer; retries now back off, and the turn stops with a message after ten in a row