apiPulse.app

Claude

Claude developer documentation and changelog updates

Claude API Changelog Monitoring

Claude integrations depend on rapidly evolving model capabilities, developer tooling, authentication flows, and documentation conventions. This Claude API Changelog Monitoring page helps teams review those updates in one place so application behavior and AI-powered workflows stay aligned with current platform changes.

Consistent Claude API Changelog Monitoring helps product and engineering teams catch model, tooling, and documentation changes before they ripple into prompts, agent workflows, or customer-facing AI features. That makes it easier to plan updates deliberately instead of reacting after something drifts.

The benefit of Claude API Changelog Monitoring is simple: your team gets a repeatable way to watch changes, evaluate risk, and act before small upstream updates turn into customer-facing bugs. Claude developer documentation and changelog updates

Claude API down?

Claude API down? Soon we will add direct API status monitoring alongside Claude API Changelog Monitoring. For now, go to the official Anthropic or Claude status resources on the provider website. In the future, we plan to detect issues even before the public status page is updated.

Recent changes

Showing the last 10 changes from this feed.

10-15-2026

2.1.301

Added Added CLAUDE_CODE_RETRY_WATCHDOG_MAX_USAGE_LIMIT_WAIT_MS so unattended retry mode (CLAUDE_CODE_RETRY_WATCHDOG) ends a request at a usage limit that resets too far away instead of waiting Added OpenTelemetry tracing guidance to the claude-api skill, including setting up trace destinations with the ant CLI Added the % motion to vim mode: jump to the matching bracket, alone or with d/c/y Added rows to a mod's Input: a text field of several lines in the terminal, where Enter submits and Shift+Enter or a backslash before Enter starts a new line Added classifier_verdict and permission_mode to OpenTelemetry tool_decision events, so auto mode classifier decisions can be told apart from permission rules Added classifier_category to OpenTelemetry tool_decision events, naming the built-in rule a classifier block matched, when OTEL_LOG_TOOL_DETAILS=1 [VSCode] Added LaTeX math rendering in Claude's responses, including $$ and multi-line \[ … \] blocks and inline $…$ and \(…\) math [VSCode] Added a "Get more usage" link to the usage-limit banner for Pro and Max plans in the VS Code and JetBrains panels Changed Changed a mod hook's .catch handler to run only when the hook throws or times out; events raised beneath the hook's own calls now skip that hook without asking its .catch Changed a mod's $.env.set to resolve with {} once the variable is set or unset, or with { deny } saying why when the write is not made Improved Improved switching to a model with a smaller context window: a conversation too long for the new model is now summarized by the previous model first Improved rendering performance while a long-running subagent works: its progress trail now updates incrementally instead of being reprocessed in full on every render Improved artifacts: pages Claude writes now paint the band above a sticky header, so scrolled text no longer shows there in the mobile apps Improved mods: in VS Code and the desktop and mobile apps, a tree drawn above the question dialog can now hold Markdown and up to 48 rows; the terminal keeps 12 plain rows

Source
10-14-2026

2.1.300

Added Added virtualText to a mod's prompt decorations: text drawn in the prompt box that never enters the draft or the submitted prompt Added cache_creation_5m_tokens and cache_creation_1h_tokens to the OpenTelemetry api_request event, splitting cache writes by lifetime Added $.ui.view({ agentId }) for mods: shows an agent's transcript in the main view when you ask, and $.ui.view({}) goes back Added a dir prop on a mod's Text for right-to-left text: on Windows and in VS Code's terminal its rows read in that direction and sit flush right Added /advisor on Claude Platform on AWS; no advisor runs until you pick one with /advisor, advisorModel or --advisor, and CLAUDE_CODE_DISABLE_ADVISOR_TOOL=1 turns it off Added OpenTelemetry GenAI semantic-convention attributes to trace spans, such as gen_ai.provider.name, gen_ai.conversation.id, gen_ai.tool.name and error.type Added support for rewriting a workflow agent's prompt and model in the agent.spawn mod hook, which could only refuse workflow agents before Added the prompt.change mod hook, raised when the prompt box's text changes without a typed edit: a recalled history entry, a clear, an undo, or a plugin's fill [VSCode] Added the claudeCode.attachSelection setting to stop text selected in the editor from being added to your messages [Claude Tag] Added support for Slack Connect channels: an Owner or Claude Tag admin can let Claude in Slack answer in channels shared with another organization; it's off by default [Claude Tag] Added a private Allow once / Deny card in Slack threads for connector actions that need your approval, so Claude asks instead of refusing; others only see that it's waiting on you [Claude Tag] Added support for Slack voice clips in Claude in Slack: Claude reads Slack's transcript of a clip when Slack has one Changed Changed CLAUDE_CODE_PROVIDER_MANAGED_BY_HOST sessions to ignore CA-bundle, tool-proxy, git TLS and git config variables like SSL_CERT_FILE in settings; under Claude Desktop, only in project settings Changed exit to force-kill background commands still running 1.5 seconds after being asked to stop; in fullscreen mode they could previously be left running Changed Claude Desktop's Code tab to apply managed settings when forceLoginGatewayUrl names an Anthropic-operated gateway that serves the session's hostname; that gateway must be reachable at start Changed claude gateway to stop at start, naming the key, on a desktop: policy key that Claude Desktop cannot use from a gateway, where it earlier started with a warning Changed large requests to api.anthropic.com to use gzip compression even when telemetry is disabled; set CLAUDE_CODE_GZIP_REQUEST_BODIES=0 to turn it off Changed the claude-api skill to leave Managed Agents sessions in place unless you ask to archive or delete them Changed background sessions to resume a carried workflow through the Workflow tool's approval instead of running it from the handoff file Changed local session transcripts to also record each API request's system prompt, tools and parameters, so a transcript you choose to share can reproduce a request exactly Changed the /sandbox mode options to read "Sandbox commands" instead of "Sandbox BashTool" Changed PermissionRequest hooks in Cowork cloud sessions: a setMode update in a hook's allow is now ignored; the rest of the approval still applies Changed hooks: updatedInput from PreToolUse and PermissionRequest hooks is now validated like Claude's own input: unknown keys are dropped, and input the tool rejects denies the call Removed the --sandbox and --no-sandbox flags from claude remote-control, which had no effect; passing either now exits with an error. Set sandbox.enabled in settings to sandbox sessions [Claude Tag] Changed access bundles an admin attached to a Slack channel to keep applying once the channel becomes a Slack Connect channel, with no need to remove and re-attach them Improved Improved WebFetch in Cowork cloud sessions to tell Claude that a page failed moments ago instead of fetching it again Improved mod sharing in the built-in plugin-authoring skill: Claude scans a mod's files for keys before opening them, and asks before scanning a folder outside the project Improved the note Claude 3 models get about an @-mentioned PDF, so they less often answer without reading it Improved artifact updates: Claude now applies a small change and republishes the artifact in one call, and makes larger edits and republishes within a single response

Source
10-14-2026

2.1.299

Added Added CLAUDE_CODE_DISABLE_FILE_MENTIONS environment variable: Claude gets the paths of @ file mentions to read with its file tools, not the files' contents Added idle compaction in the terminal: a 200K+ token conversation left idle for about 54 minutes is compacted before its one-hour prompt cache expires, so your next message doesn't reprocess it all Added CLAUDE_CODE_IDLE_COMPACT_MIN_TOKENS to change idle compaction's 200K-token minimum; "idleCompaction": false in settings.json turns it off. Both need v2.1.290 or later Added $.prompt.media so a prompt.submit hook of a mod installed by managed settings can read the bytes of an image or document attached to the prompt Added $.session.identity() for mods installed by managed settings: how the session is signed in, and its organization and email when managed forceLoginOrgUUID lists that organization Added size, weight, mono and tabular to a mod's Text and named spacing steps (xs to xl) to its Box; bold is deprecated in favor of weight Added --shutdown-drain-sec to claude self-hosted-runner orchestrator: on SIGTERM it stops polling and gives the poll in flight and running spawn hooks up to that many seconds to finish Added the skill's frontmatter, source, plugin name and file path to what a mod's skill.prompt hook receives Added /effort and /fast in agent view to set what new sessions start with; a bare /model, /effort or /fast there now opens a picker Added a "safe mode" line to the agents view peek panel for background sessions started with --safe-mode Added a one-time note when plan mode won't ask before most edits or commands because bypass permissions is available Added --disallow-tools and a disallowed_tools case field to claude plugin eval to keep specific built-in tools, such as Agent, out of eval runs Added support for turning off the attribution block in Claude Desktop's Code tab: set CLAUDE_CODE_ATTRIBUTION_HEADER=0 in the env of a Claude apps gateway's code policy Added a field to the attribution block in Claude Code sessions behind a Claude apps gateway; remove the block with CLAUDE_CODE_ATTRIBUTION_HEADER=0 Added a queue door to the session.append mod hook, so a mod can make the transcript's queue records differ from the prompt as sent Added a note in /plugin and claude plugin validate naming a mod's hooks that are skipped where an organization manages Claude Code Added /usage warnings for max effort, workflows, always-on context and large tool results [Claude Tag] Added the ability for Claude in Slack to delete a canvas it created in a channel when someone asks it to Changed Changed plugin hooks and workflow scripts to refuse values they hand back that nest deeper than 28,000 levels, with an error naming the limit (workflow scripts allowed 100,000) Changed actions a plugin hook can block to be refused, not let through, when the hook cannot be handed them or cannot hand back its answer; a tool that already ran has its result withheld Changed requests to claude.ai's connector proxy and to Anthropic-hosted MCP servers to no longer follow HTTP redirects; redirects by a connector's own server are unaffected Changed MCP requests in cloud and self-hosted runner sessions to no longer follow HTTP redirects from the session's MCP proxy Changed skill and command loading: one whose file or folder name has hidden, direction-changing or blank-like characters, is no longer offered until renamed; such a name: is ignored Changed ui.render trees in claude plugin test: each mod's Box or Text root now carries part: { plugin } naming the mod, so exact-tree assertions must include it Changed WebFetch page reads to pick their effort as web searches do: the caller's level on the caller's own model, otherwise the level settings give the small model Changed claude plugin test to fail a call to a mod's served $ method that has not answered within ten seconds, as a session does Changed MCP allow rules to reach only the server they name: mcp__a no longer allows a server named a__b or a_; write mcp____* with the server's whole normalized name Changed agent tools: lists to take only the named MCP server's tools; list a server whose name contains __ as mcp____* Changed Claude in Chrome in Cowork cloud sessions outside auto mode: an approved-site action the safety classifier flags now asks you instead of being refused, unless managed settings apply Changed cloud session and Remote Control MCP connectors to negotiate MCP protocol version 2026-07-28 by default on installs that fetch no flags; MCP_PROTOCOL_NEGOTIATION=legacy opts out Changed MCP tool descriptions and server instructions from Anthropic's first-party MCP servers at api.anthropic.com to reach Claude in full instead of being cut at 4,096 characters Changed auto mode in Cowork cloud sessions: a PermissionRequest hook can no longer approve shell commands or subagents; those prompts wait or are denied Changed the resume command printed at exit: it names the session by its ID and no longer by its name, so that nothing in a session name can run when the line is pasted Changed the resume command printed at exit of a worktree session: it uses -w and -r if the long flags do not fit the terminal. If neither fits a kept worktree, rows above it say where to run it Changed /btw side questions in non-interactive sessions to return a timeout error when still unanswered after 11 minutes Changed UserPromptSubmit hooks to run before a skill or custom slash command expands, so a hook that blocks the prompt now also stops its embedded shell commands Changed a skill's own front-matter UserPromptSubmit hook to first run on the prompt after the one that invokes the skill Changed the turn.start mod hook to also hear subagents' and teammates' turns, not only the main loop's; tell them apart by e.agentId (absent on the main loop) Changed the errors shown when /ultrareview can't upload a repository to stop suggesting git add ., which could stage or commit untracked files such as .env Changed the cyber safeguard notice to no longer ask people to apply to the Cyber Verification Program [Cloud sessions] Changed deleting a self-hosted environment to turn off its routines right away, with the reason shown on each routine, instead of leaving their runs to fail [Claude Tag] Changed how Claude in Slack corrects a message it got wrong: it edits the message in place and adds a short "Edited" note instead of striking through the old text [Claude Tag] Changed Claude in Slack to join channels with more than 100 members quietly, with no intro message

Source
10-09-2026

2.1.296

Added Added a code key to the Claude apps gateway's managed.policies[]: the same settings as cli, also applied in Claude Desktop's Code tab; beside desktop, it turns on Claude Desktop's gateway mode Added autoCompactWindow to subagent frontmatter and --agents definitions, so a subagent can auto-compact earlier than the main conversation's window Added CLAUDE_CODE_WORKFLOW_SUBAGENT_MODEL to run every workflow agent on one model while other subagents keep theirs Added CLAUDE_CODE_OVERLOADED_RETRY_MAX_DELAY_MS environment variable to set a longer maximum delay for the backoff when retrying an overloaded (529) request Added a note in /plugin on a plugin whose hooks are left out because another enabled plugin has the same name Added an allow_large option to the Read tool so Claude can read a text file past the usual size limits in one call when it needs the whole file and the context has room [Cloud sessions] Added a status filter to the Sessions and Runners lists on a self-hosted environment's Activity tab in admin settings; you can pick several statuses at once [Claude Tag] Added creating, editing and deleting workspace and channel memory files on the Activity page's Memory tab for members with the Claude Tag Admin permission Changed Updated /cost, the status line, --max-budget-usd and the SDK's cost figures to price Sonnet 5.5 cache reads at $0.10 per million tokens (was $0.20) Updated the bundled dataviz skill: lighter violet for the seventh series in light mode, softer primary text in dark mode, and compact y-axis labels like 1K Changed the default limit on MCP tool descriptions sent up front and on MCP server instructions from 2,048 to 4,096 characters Changed ←: a turn or ! command started while the session moves to the background is now stopped instead of finishing out of sight [VSCode] Changed Claude in Chrome to ask before browser actions in every session, including one connected with @browser, as the terminal does; allowing a site for the session stops repeat asks [Claude Tag] Changed Claude in Slack to show the footer with the session link, model and cost only on its newest reply in a thread; the reply before it drops the footer

Source
10-08-2026

2.1.295

Added Added onFailure: "block" for command and HTTP hooks: a hook that can't start, times out, or exits with an unexpected code blocks the action instead of letting it through Added Program Status Protocol (OSC 7501) support: terminals that implement it can show whether Claude Code is working, waiting on you, or done Added quoted text to the /copy picker, so a drafted message copies without its > markers Added a warning to claude plugin install, enable, disable and marketplace add when the settings file they write to does not load Added a line on stderr, when it is a terminal, that says what a claude -p run is waiting for when it stays open after its last turn Added support for timeouts.upstream_ttfb_ms on the Claude apps gateway's Bedrock, Vertex, Foundry and other cloud upstreams: a value you set now limits how long a stream may take to start there, after which it fails over or gets a 502 Added a "Backgrounding cancelled" message when you stop the turn while ← is waiting for the current tool to finish Added an optional models list to every Claude apps gateway upstream: only the listed models are sent there, on failover too, and one * in an entry is a wildcard Added support for forceLoginMethod: "gateway" and forceLoginGatewayUrl in your own user settings on machines with no managed settings, so /login opens on that Claude apps gateway Added advice to claude plugin validate when a plugin's README has no install line: it prints the line to paste and never changes the exit code, even with --strict Added upstream_request_id to the Claude apps gateway's inference audit event: the request ID from Amazon Bedrock, the Anthropic API or another upstream, for support cases Added $.ui.notify for mods: raises a native notification through your own notification setting and says which channel sent it Added children to a mod's Button: strings and Text, so a row of a list is one pressable with a chip or a dim detail inside Added CLAUDE_CODE_RETRY_WATCHDOG_MAX_WAIT_MS to limit how long unattended retry mode (CLAUDE_CODE_RETRY_WATCHDOG) waits out 429 and 529 errors Added a request-id header to the Claude apps gateway's successful inference responses, so request_id in Claude Code telemetry matches the gateway's audit log [VSCode] Added a chat row for files Claude sends you: click a file's name to open it in the editor; Claude's caption shows underneath, and the row stays visible in Focus view [Claude Tag] Added a confirmation in Claude Tag admin settings before adding a channel manager moves that member to Custom roles, which can remove their other access Changed Changed MCP tool descriptions the model loads through tool search to be cut at 16,384 characters instead of 2,048 Changed subagents to preload at most 32 skills from the skills field, each once; a subagent with the Skill tool can still invoke the rest Changed Ctrl+C at the idle prompt of an attached background session to leave a pending /loop wakeup alone, so pressing it twice detaches and the loop keeps running; press Esc to stop it Changed claude agents stopped with its background service (macOS, or Linux without the service installed): running sessions now stop in about a minute unless it is run again, and a notice says so Changed claude.ai connectors to negotiate MCP protocol version 2026-07-28 by default on installs that fetch no flags; MCP_PROTOCOL_NEGOTIATION=legacy opts out Changed Artifact pages with no background of their own to show on white instead of off-white Changed what Claude and you read when a mod denies a tool call after the tool ran: it now says the tool ran and a plugin withheld its result Changed tab stops to count from where a text starts instead of from the screen's left edge: an answer indented by 2 has its first stop 8 cells in, where it was 6 Changed the Artifact tool's permission prompts with telemetry disabled to the same five questions other installs get, instead of asking before each read of someone else's artifact and each data edit Changed scheduled and Run now routine runs in installs with telemetry disabled to publish new private artifacts, and update your own, without asking, as in other installs Changed toasts from your organization's mods to show ahead of other mods' toasts instead of waiting behind them Changed the Claude apps gateway to start with a warning and serve a desktop policy key its bundled Claude Desktop schema doesn't know, so new Desktop settings need no gateway upgrade Changed WebSocket (ws) MCP servers: a message over 16 MiB is no longer parsed and closes the connection, the limit the other transports already have Self-hosted runner: Changed the runner to stop passing CCR_AUTO_MODE_ALLOW, CCR_AUTO_MODE_ENVIRONMENT and CCR_AUTO_MODE_SOFT_DENY into a session's environment [Claude Tag] Changed the settings confirmation cards Claude posts in a Slack channel to stay open for 30 minutes instead of 10 [Claude Tag] Changed Claude's notice that a channel shared across Enterprise Grid workspaces uses organization defaults to post only when someone mentions Claude, at most once a month

Source
10-08-2026

2.1.281

Added 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 Added MCP server checks to claude plugin validate: it reports .mcp.json entries that would be silently dropped at load, undeclared ${user_config.*} references, and insecure URLs Added an auto mode recommendation to /insights that estimates how many permission prompts auto mode could have handled in your recent sessions Added a scrollbar to the /skills, /mcp and /plugin Installed lists in fullscreen mode, like the one /workflows now has: it appears while the mouse is over the list and can be clicked or dragged [VSCode] Added a Continue/Stop prompt in the VS Code and JetBrains panels when auto mode falls back to billed classifier requests, replacing the unanswerable warning line [Claude Code on the web] Added a Fast mode switch to the composer's model menu in cloud sessions, shown when your plan includes fast mode and the selected model supports it [Claude Code on the web] Added a settings shortcut on the GitHub setup tip and a "Troubleshoot GitHub connection" link in the repository pickers, both opening your GitHub connection page [Claude Tag] Added a short line in the Slack thread after someone presses Stop, naming who stopped Claude's response and saying to mention @Claude to continue Changed Changed send now (ctrl+enter or ctrl+x ctrl+s) to move running tools to the background instead of cancelling the turn Changed auto mode so that, where its classifier review runs server-side, read-only and sandboxed shell commands also wait for that review and are blocked when it flags them Changed CLAUDE_CODE_AUTO_MODE_SERVER to also apply on a direct Anthropic API connection: 0 opts out of the server-side auto mode classifier (the local classifier then counts toward usage), 1 opts in Changed the dangerous rm prompt in --dangerously-skip-permissions and auto mode to wait 2 minutes for an answer, then deny the command with a rewrite hint so unattended sessions keep going (CLAUDE_CODE_DISABLE_DANGEROUS_RM_TIMEOUT=1 turns this off) Changed AGENTS.md support to also work on Amazon Bedrock, Google Vertex AI, Microsoft Foundry, LLM gateways, and sessions with telemetry disabled Changed Claude apps gateway to refuse to start when a managedMcpServers entry's envHelper path starts with \??\ or /??/, a path form current Claude Desktop refuses to run Changed self-hosted runners to pass system prompts to Claude Code as private files instead of command-line text, so large prompts no longer fail the launch; a wrapper or command hook that appends --system-prompt or --append-system-prompt must switch to --system-prompt-file or --append-system-prompt-file Changed queued messages to show in the conversation above the spinner instead of under it Changed the session artifact links under the prompt into one footer pill (⧉ name or ⧉ N) that opens /artifacts, which now lists this session's artifacts first Changed the Artifact tool to let Claude load scripts from unpkg.com in artifact pages Changed hovering a list row in fullscreen mode, including in /config, to tint the row instead of drawing a second ❯ pointer beside the focused row's Changed /mcp: each server's row now starts with its status icon and name, says its state once, and in a narrow terminal drops trailing facts like "managed" before shortening the name Changed /workflows: each run's row leads with its status icon and elapsed time, and a narrow terminal keeps the run's name and time, dropping the agent and token counts first Changed Remote Control attachment downloads to reuse connections and to skip files already downloaded in the session Changed MCP resource lists (the resource list tool and @-mention suggestions) to skip MCP Apps UI resources; reading one by URI still works Changed claude plugin uninstall --json and the /plugin dialog to say a plugin's data was kept when its folder stays because another installed plugin uses it or install records cannot be read Changed the background tasks list (/tasks): pressing x on a running /ultrareview now asks for confirmation before stopping the review Removed the leftover "(removed)" /agents entry from the command menu and /help; typing /agents still explains where the wizard went [Claude Tag] Changed the routine list Claude gives when asked in a Slack thread to show that thread's own scheduled tasks by default instead of every routine in the channel

Source
10-08-2026

2.1.287

Added 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: 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 [VSCode] Added "Run in background" to a running command or sub-agent, to move it to the background and keep working [VSCode] Added the output of background shells and Monitors to their cards in the agent map Changed Changed a shell write through a repo-committed symlink onto a sensitive file or out of the working tree to name where it lands and wait for a person, on lines with a ~ target too Changed Opus 4.7+ and Fable to use a 1M context window by default on Bedrock, Vertex, Foundry and the Claude apps gateway, with no [1m] suffix (CLAUDE_CODE_DISABLE_1M_CONTEXT=1 keeps 200K) Changed replies from claude agents to arrive as queued messages; slash commands other than /stop sent while a turn is running now run when it ends Changed whole-tool Bash allow rules and allowing hooks to prompt for, not run, shell writes to files Claude Code's file tools refuse outright (the Anthropic profile store, the host credentials file) Changed right-click paste on Windows and Linux, and middle-click paste on Linux, to happen when the button is released; moving the pointer away before releasing cancels it Changed MCP server alwaysLoad: false to defer all of that server's tools behind tool search Changed screen reader mode to write new or changed lines without first pausing with the cursor at the start of the line; set CLAUDE_AX_PREPARK_MS=50 to restore the pause Changed automatic model switches after a flagged message to keep your current effort level instead of the new model's default Changed waiting permission prompts to show oldest first, so a new prompt no longer covers the one you're reading (prompts with a countdown still open on top) [VSCode] Changed the Claude in Chrome "Enabled by default" switch to also connect the editor's own sessions, which still ask before browser actions

Source
10-08-2026

2.1.294

Fixed prompt and agent hooks written as instructions (such as "Block commands that...") allowing what they should block Improved how prompt hooks on Stop and SubagentStop written as instructions (such as "Carry on if the build is broken") are judged, so Claude is less likely to stop early

Source
10-07-2026

2.1.293

Added 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 Changed Reverted the auto mode denial message change from 2.1.281 that told Claude a denial covers the outcome, not only the exact command Reverted the 2.1.290 fix for cloud sessions staying asleep after a container restart lost a pending /loop wakeup or scheduled task; Claude is no longer told, and the session stays asleep Changed claude.ai skill syncing to check for changes about every 40 minutes, instead of every 10, while no session is in use Changed the order of agent lists and of MCP servers announced to the model: names with non-ASCII characters now sort after ASCII names Changed OpenTelemetry claude_code.at_mention logging to emit at most 100 agent and 100 MCP-resource events each time a prompt is read Self-hosted runner: Changed the orchestrator to sleep 4 to 6 seconds between polls instead of a constant 5, so several replicas for one environment stop polling at the same moment [Claude Tag] Changed Claude in Slack to join announcement channels, where only admins can post, without posting its intro [Claude Tag] Changed the limit on channel rules in Claude Tag admin settings from 20 to 50 for each workspace and for the organization-wide Slack page

Source
10-06-2026

2.1.292

Added Added --marketplace 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 [Claude Tag] Added an Edit button to the Allowed domains card on a channel's Configure page, so Enterprise admins can open the access bundle that sets the channel's domains [Code Review] Added the period's total with its change from the previous period, and a breakdown by repository, to the PRs reviewed chart in Code Review analytics Changed Changed local (stdio) MCP server connections to negotiate protocol version 2026-07-28 by default on every install, including Bedrock, Vertex and Foundry; MCP_PROTOCOL_NEGOTIATION=legacy opts out Changed 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 Changed usage limit messages to write claude.ai settings links with https:// so terminals and apps can make them clickable Changed scheduled and Run now routine runs to publish a new artifact only you can see without asking for approval; artifacts that request connectors or other access still ask Changed agent names to allow at most 256 characters: a longer one is rejected, and a skill's or a plugin file's name longer than that is ignored [Claude Tag] Changed the first message of a Slack thread continued with !fork to a card showing where it came from, the request, and who asked, with a link to the original thread [Claude Tag] Changed the organization-wide and default spend limit boxes on Claude Tag's spend limits page in admin settings to save only when you press Save or Enter, not when you click away

Source