Claude Code v2.1.84 / Changelog

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27 entries

Changesopen

Computer Use MCP Server (macOS)#

What

A comprehensive, in-process MCP server that allows Claude to control macOS desktop applications — clicking, typing, scrolling, dragging, and taking screenshots — with a tiered permission system.

Usage

claude --computer-use-mcp

Details

Applications must be explicitly approved by the user via request_access before any interaction
Three permission tiers: read (screenshots only, no interaction), click (visible + plain left-click), and full (typing, key presses, modifier-clicks, drag-drop)
Browsers and trading apps default to "read" tier; terminals/IDEs default to "click" tier; other apps get "full"
Tool set includes: screenshot, left_click, right_click, middle_click, double_click, triple_click, type, key, hold_key, scroll, mouse_move, left_mouse_down, left_mouse_up, left_click_drag, mouse_position, computer_batch, activate_app, switch_display, read_clipboard, write_clipboard, zoom, wait, list_granted_applications
computer_batch executes a sequence of actions in ONE tool call, avoiding round-trip latency between steps
Multi-monitor support with switch_display to capture different monitors
Clipboard read/write requires separate grant flags (clipboardRead, clipboardWrite)
System-level key combos (e.g. Cmd+Q, Ctrl+Alt+Delete) require the systemKeyCombos grant
Pixel comparison validation detects when screen content changed since last screenshot
Includes a comprehensive deny-list for sensitive apps (financial, crypto wallets, etc.) that cannot be controlled
macOS Accessibility and Screen Recording permissions required
Esc hotkey registered for user to abort computer control at any time

Evidence

In-process Computer Use MCP server (search for "In-process Computer Use MCP server started", "--computer-use-mcp", "request_access")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Computer Use Teach Mode #

What

A guided-tour teaching system built on top of Computer Use that allows Claude to walk users through UI workflows step-by-step with interactive tooltips.

Details

request_teach_access initializes teach mode with app permissions and a stated reason (shown in approval dialog)
teach_step shows a tooltip with explanation text, optional anchor coordinates (pointing arrow), and actions to execute when user clicks "Next"
teach_batch batches multiple steps into one round-trip for predictable sequences on the same page
User can click "Exit" at any point to end the tour
Text emitted outside teach_step calls is NOT visible until teach mode ends
During teach mode, request_access cannot add new permissions (would hide the tooltip UI)
Returns screenshots after each step so Claude can anchor the next step's coordinates

Evidence

Teach mode tools (search for "teach_step", "teach_batch", "request_teach_access")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

PowerShell Tool (Windows)#

What

A dedicated PowerShell command execution tool for Windows users, providing native PowerShell syntax support with comprehensive security analysis.

Details

Enabled via the CLAUDE_CODE_USE_POWERSHELL_TOOL environment variable on Windows
Uses pwsh (PowerShell 7+) for command parsing and execution
Full AST-based security analysis of PowerShell commands before execution
Validates PowerShell-specific patterns: cmdlet names, parameter types, pipeline chains, .NET type usage, script blocks
Recognizes dangerous patterns: Invoke-Expression, encoded commands, COM object creation, module loading, splatting, UNC paths
Read-only cmdlets (e.g. Get-ChildItem, Get-Content, Select-String, Get-Process) are auto-allowed
Handles PowerShell-specific security concerns: -FilePath execution, -Command re-invocation, Start-Process nesting
Provides PowerShell syntax guidance in tool description (variable syntax, pipe objects, here-strings, cmdlet naming)
Falls back gracefully if PowerShell is not installed
Enterprise policy enforcement: sandboxing policy blocks shell execution on native Windows when sandbox is unavailable

Evidence

PowerShell tool implementation (search for "PowerShell command", "CLAUDE_CODE_USE_POWERSHELL_TOOL", "Run PowerShell command")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

`--task-budget` CLI Flag #

What

A new hidden CLI flag that sets an API-side task budget in output tokens via output_config.task_budget.

Usage

claude --task-budget 50000

Details

Value must be a positive integer (number of tokens)
Controls the API's output token budget for the task
Hidden from --help output (intended for programmatic/advanced use)

Evidence

Task budget flag (search for "--task-budget", "task-budgets-2026-03-13")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

"You've Been Away" Re-engagement Prompt #

What

When returning to a conversation after being idle, Claude Code now shows an interactive prompt suggesting you may want to start fresh.

Details

Displays idle time (e.g., "You've been away 2h 15m") and conversation token count
Three options: "Continue this conversation", "Send message as a new conversation" (clears context), or "Don't ask me again"
Helps save usage on stale conversations where starting fresh would be more efficient

Evidence

Re-engagement UI component (search for "You've been away", "Continue this conversation", "Send message as a new conversation")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

TaskCreated Hook Event #

What

A new hook event type that fires when a task (e.g., from /loop or teammate creation) is being created.

Details

Hook receives JSON input with task_id, task_subject, task_description, teammate_name, and team_name
Exit code 0: stdout/stderr not shown
Exit code 2: show stderr to model and prevent task creation
Other exit codes: show stderr to user but proceed
Allows organizations to gate or customize task creation behavior

Evidence

TaskCreated hook (search for "TaskCreated", "When a task is being created")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

"Open in Claude Code on the Web" Action #

What

Ultraplan and ultrareview sessions now offer an "Open in Claude Code on the web" action, allowing users to view and interact with cloud sessions directly in the browser.

Details

Available in the ultraplan and ultrareview status bar menus
Links to the cloud session URL at code.claude.com

Evidence

Web open action (search for "Open in Claude Code on the web")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

WorktreeCreate Hook Output #

What

The WorktreeCreate hook event now supports hook-specific output providing the absolute path to the created worktree directory.

Details

JavaScript hooks return { hookEventName: "WorktreeCreate", worktreePath: "<path>" }
Command hooks print the path on stdout instead
Enables custom worktree workflows via hooks

Evidence

WorktreeCreate hook output (search for "Hook-specific output for the WorktreeCreate event")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

v2.1.50 VCS-Agnostic Worktree Isolation via Hooks

"Remote Sessions" Renamed to "Cloud Sessions"#

The UI now uses "cloud session" / "cloud sessions" terminology instead of "remote session" / "remote sessions" throughout the ultraplan and session management interfaces.

Evidence

Terminology change (search for "cloud session", "cloud sessions")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

Improved Permission Denial Dialog #

The permission prompt now offers a "Deny, and tell Claude what to do differently" option (with Esc shortcut), giving users a clear way to deny a tool call and redirect Claude's approach instead of just blocking.

Evidence

Deny option (search for "Deny, and tell Claude what to do differently")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Theme Detection: "Auto (match terminal)" Replaces "Auto (follow system)"#

The automatic theme setting now reads the COLORFGBG environment variable (set by many terminals) to detect whether the terminal uses a light or dark background, rather than querying macOS system settings. The label changed from "Auto (follow system)" to "Auto (match terminal)" to reflect this behavior.

Evidence

Theme detection (search for "Auto (match terminal)", "COLORFGBG")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

MCP Connector Deduplication #

When claude.ai provides built-in MCP connectors that duplicate manually-configured servers (matching by server URL), the built-in connector is automatically suppressed to avoid conflicts. A debug log message is emitted.

Evidence

Connector dedup (search for "Suppressing claude.ai connector")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

v2.1.71 Duplicate MCP Server Suppression

Server Instructions Truncation #

MCP server instructions that exceed the maximum allowed length are now truncated with a logged warning, rather than potentially causing errors.

Evidence

Truncation handling (search for "Server instructions truncated")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Skill Content Truncation During Compaction #

During conversation compaction, large skill/prompt content is now truncated with a helpful message: "[... skill content truncated for compaction; use Read on the skill path if you need the full text]". This reduces token usage during compaction while preserving the ability to re-read full content.

Evidence

Skill truncation (search for "skill content truncated for compaction")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

v2.0.41 Truncation Indicators

Dynamic Agent Type Notifications #

When agent types change mid-conversation (e.g., from plugin/MCP server updates), Claude now receives explicit notifications: "New agent types are now available for the Agent tool" and "The following agent types are no longer available" — helping it stay aware of available capabilities.

Evidence

Agent notifications (search for "New agent types are now available", "The following agent types are no longer available")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

API Request ID Tracking (`x-client-request-id`)#

All API requests to Anthropic's first-party service now include an x-client-request-id header. When API errors occur, the request ID is surfaced in the error message ("give this to the API team for server-log lookup"), making it easier to debug issues with Anthropic support.

Evidence

Request ID tracking (search for "x-client-request-id", "API error x-client-request-id=")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

Consecutive Auth Failure Detection #

The CCR (Claude Code Remote) client now tracks consecutive authentication failures. If multiple auth failures occur with a valid-looking token, the client exits cleanly instead of retrying indefinitely, preventing hung sessions.

Evidence

Auth failure handling (search for "consecutive auth failures with a valid-looking token")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Ultraplan Stop Confirmation #

Stopping an ultraplan session now shows a confirmation dialog ("Stop ultraplan?") with "Terminate session" and "Back" options, preventing accidental cancellation.

Evidence

Stop confirmation (search for "Stop ultraplan?", "Terminate session")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Improved Remote Control Error Messages #

Remote Control error messages are now more specific and actionable:

Requires a claude.ai subscription (not just login)
Explains that long-lived tokens from setup-token or CLAUDE_CODE_OAUTH_TOKEN are limited to inference-only
Provides clear guidance to run claude login

Evidence

RC error messages (search for "Remote Control requires a claude.ai subscription", "Remote Control requires a full-scope login token")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

v2.1.234 claude setup-token rejects extra arguments

OAuth URL Migration #

The claude.ai OAuth authorization endpoint has been updated from claude.ai/oauth/authorize to claude.com/cai/oauth/authorize.

Evidence

URL change (search for "claude.com/cai/oauth/authorize")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Configurable MCP Tool Output Token Limits #

The maximum MCP tool output size is now configurable via both the MAX_MCP_OUTPUT_TOKENS environment variable and the tengu_satin_quoll feature flag, instead of being hardcoded at 25,000 tokens.

Evidence

Configurable limits (search for "MAX_MCP_OUTPUT_TOKENS") — function PV8 at line ~319854

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

Plugin Source Tracking #

Plugin entries now include a source field in "name@marketplace" format, with sentinels "name@inline" for --plugin-dir session plugins and "name@builtin" for built-in plugins. This enables better identification and management of plugin origins.

Evidence

Plugin source field (search for '@internal Plugin source identifier in "name\\@marketplace" format')

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

v1.0.74 Command Source Tracking

Channel Plugin Allowlists #

A new allowedChannelPlugins managed setting allows Teams/Enterprise admins to restrict which channel plugins can be enabled. When set, it replaces the default Anthropic allowlist — admins decide which plugins their organization can use.

Evidence

Channel allowlist (search for "allowedChannelPlugins", "Teams/Enterprise allowlist of channel plugins")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Custom Model Capability Overrides #

Third-party API users can now declare model capabilities via environment variables: ANTHROPIC_DEFAULT_OPUS_MODEL_SUPPORTED_CAPABILITIES, ANTHROPIC_DEFAULT_SONNET_MODEL_SUPPORTED_CAPABILITIES, and ANTHROPIC_DEFAULT_HAIKU_MODEL_SUPPORTED_CAPABILITIES. These are comma-separated capability strings that Claude Code checks when deciding which features to enable for custom models.

Evidence

Capability env vars (search for "ANTHROPIC_DEFAULT_OPUS_MODEL_SUPPORTED_CAPABILITIES")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

PowerShell Output Persistence #

Long command outputs that exceed the inline display limit are now persisted to disk, with the tool result including the file path and total output size. This prevents loss of large command outputs.

Evidence

Output persistence (search for "Path to persisted full output when too large for inline", "Total output size in bytes when persisted")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

v2.1.45 Output Truncation for Large Bash Command Output

Ultraplan Status Bar Improvements #

The ultraplan footer now shows a "ready · shift+↓ to view" hint and supports a footer:down keybinding to quickly scroll to the ultraplan status. Cloud session status is displayed inline with "ultraplan · cloud session · No need to wait — Claude will notify you when done."

Evidence

Status bar updates (search for "ready · shift+↓ to view", "footer:down")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Slack Message Link Parsing #

When a user's message contains a message_link field pointing to a Slack archive URL, Claude Code now parses the channel information from the link. This enables richer context when conversations originate from Slack integrations.

Evidence

Slack link parsing (search for "message_link", regex slack\.com\/archives)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

2 entries

Bug Fixesopen

#

Fixed interactive prompt detection: commands that appear to be waiting for interactive input now get a more helpful error message suggesting piped input or non-interactive flags (search for "appears to be waiting for interactive input")

Fixed GitHub issue link rendering to use owner/repo#123 format instead of just #123, producing proper cross-repository links (search for "owner/repo#123")

Fixed table cell rendering by tracking blank cells (cellIsBlank property), improving display of sparse tabular data

Fixed auto-backgrounded task tracking: the tool result now includes a was_auto_backgrounded field when a command was auto-backgrounded by the assistant-mode blocking budget (search for "auto-backgrounded by the assistant-mode blocking budget")

Agent List in System Messages [Gradual Rollout]#

Feature flag

tengu_agent_list_attach Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.84: no gate table built for this version

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.84. It isn't a statement about your account. What a flag value here can and cannot tell you

What

Agent type descriptions can be injected directly into system-reminder messages instead of only in the Task tool description.

Status

Feature-flagged via tengu_agent_list_attach (default: false). Can be overridden with CLAUDE_CODE_AGENT_LIST_IN_MESSAGES environment variable.

Details

When enabled, available agent types are listed in <system-reminder> messages in the conversation
Agent type descriptions use the format: - agentType: whenToUse (Tools: toolList)
This helps models discover available agent types more reliably

Evidence

Agent list feature (gated by tengu_agent_list_attach, search for "CLAUDE_CODE_AGENT_LIST_IN_MESSAGES")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Claude Code v2.1.84

Changesopen

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Bug Fixesopen

Anthropic’s official release notes