2026-03-20

• Reduced memory usage when viewing large files in their entirety
• /login device flow works correctly in Codespaces and remote terminal environments
• Working directory is correctly detected when using --server mode with remote sessions
• Arrow keys work correctly in terminals using application keypad mode
• Repo hooks (.github/hooks/) now fire correctly when using prompt mode (-p flag)
• /copy writes formatted HTML to clipboard on Windows for pasting into Word, Outlook, and Teams
• SDK clients can register custom slash commands when starting or joining a session
• SDK clients can show elicitation dialogs to the user via session.ui.elicitation
• Add experimental support for multiple concurrent sessions
• Add --effort as a shorthand alias for --reasoning-effort
• Add /undo command to undo the last turn and revert file changes
• Markdown bullet lists render correctly in alt-screen mode when content contains hard line breaks
• Elicitation form shows Shift+Tab hint for navigating between fields in reverse
• Remote session URL displays as a compact clickable 'Open in browser' link instead of a duplicated raw URL
• Session history is no longer lost when exiting via /quit, Ctrl+C, or restart
• Hook matcher filters defined in nested hook structures are now correctly applied to inner hook items
• Plugins using .claude-plugin/ or .plugin/ manifest directories now load their MCP and LSP servers correctly
• /terminal-setup no longer shows a misleading error for WSL users
• Model picker reorganizes models into Available, Blocked/Disabled, and Upgrade tabs based on user plan and policy
• Workspace MCP servers from .mcp.json, .vscode/mcp.json, and devcontainer.json are now loaded only after folder trust is confirmed
• Config settings renamed to camelCase: includeCoAuthoredBy, effortLevel, autoUpdatesChannel, statusLine (old names still work)
• When copying assistant responses, the leading 2-space UI indent is stripped from selections where all selected lines share that indent
• Plugins loaded via --plugin-dir now appear in /plugin list under a separate 'External Plugins' section

Added

• /copy writes formatted HTML to clipboard on Windows for pasting into Word, Outlook, and Teams

Added

• SDK clients can register custom slash commands when starting or joining a session
• SDK clients can show elicitation dialogs to the user via session.ui.elicitation
• Add experimental support for multiple concurrent sessions
• Add --effort as a shorthand alias for --reasoning-effort
• Add /undo command to undo the last turn and revert file changes

Improved

• Model picker reorganizes models into Available, Blocked/Disabled, and Upgrade tabs based on user plan and policy
• Workspace MCP servers from .mcp.json, .vscode/mcp.json, and devcontainer.json are now loaded only after folder trust is confirmed
• Config settings renamed to camelCase: includeCoAuthoredBy, effortLevel, autoUpdatesChannel, statusLine (old names still work)
• When copying assistant responses, the leading 2-space UI indent is stripped from selections where all selected lines share that indent
• Plugins loaded via --plugin-dir now appear in /plugin list under a separate 'External Plugins' section

Fixed

• Markdown bullet lists render correctly in alt-screen mode when content contains hard line breaks
• Elicitation form shows Shift+Tab hint for navigating between fields in reverse
• Remote session URL displays as a compact clickable 'Open in browser' link instead of a duplicated raw URL
• Session history is no longer lost when exiting via /quit, Ctrl+C, or restart
• Hook matcher filters defined in nested hook structures are now correctly applied to inner hook items
• Plugins using .claude-plugin/ or .plugin/ manifest directories now load their MCP and LSP servers correctly
• /terminal-setup no longer shows a misleading error for WSL users

2026-03-19

• Spurious I/O error messages (ENOTCONN, EIO) no longer appear in the timeline during SSH disconnects or terminal closes
• Add include_gitignored config option to include gitignored files in @ file search
• Copying text on WSL correctly preserves CJK and other non-ASCII characters
• Marketplace and plugin installs from shortened URLs (e.g., aka.ms links) now work correctly

2026-03-18

• Agent mode labels and borders display correct colors on non-truecolor terminals (tmux, SSH, screen)
• Alternate screen buffer is now enabled by default for a cleaner terminal experience
• Exit plan mode tool remains available when an extension subprocess joins an active session
• Repo-level hooks are loaded only after folder trust is confirmed, not before the trust dialog is shown
• Idle subagents no longer clutter the /tasks view — they are hidden after 2 minutes of inactivity
• Add extension mode setting to control extensibility
• MCP servers can be validated against configured registries using the experimental MCP_ALLOWLIST feature flag
• Allow --resume to accept a task ID in addition to a session ID
• Support defining hooks in settings.json, settings.local.json, and config.json
• Scroll works correctly in macOS Terminal.app and other terminals that don't support SGR mouse encoding
• Mouse scroll works correctly in tmux after returning from an external editor
• Ctrl-C in prompt mode now exits immediately instead of waiting for the request to complete
• Spinner animation no longer delays visible output from appearing in the timeline
• Dialog titles display consistently inside all dialog boxes

Added

• Add extension mode setting to control extensibility
• MCP servers can be validated against configured registries using the experimental MCP_ALLOWLIST feature flag
• Allow --resume to accept a task ID in addition to a session ID
• Support defining hooks in settings.json, settings.local.json, and config.json

Improved

• Dialog titles display consistently inside all dialog boxes

Fixed

• Scroll works correctly in macOS Terminal.app and other terminals that don't support SGR mouse encoding
• Mouse scroll works correctly in tmux after returning from an external editor
• Ctrl-C in prompt mode now exits immediately instead of waiting for the request to complete
• Spinner animation no longer delays visible output from appearing in the timeline

2026-03-17

• Improve color contrast across CLI themes for better readability and accessibility
• User messages display with a subtle background color for visual differentiation from assistant messages
• Add support for gpt-5.4-mini model
• Tab bar selected tab uses compact [label] style with cleaner spacing
• Add "customize" mode to system message config for section-level system prompt overrides
• Double-Esc clears input when text is present, or triggers undo when the prompt is empty, with a hint shown after the first Esc
• Session resume no longer fails with 'Session file is corrupted' for sessions created before 1.0.6
• Branch indicator distinguishes unstaged changes (*), staged changes (+), and untracked files (%) in the header
• Add experimental SDK session APIs to list and manage skills, MCP servers, and plugins, with optional config auto-discovery from the working directory
• Add subagentStart hook that fires when a subagent is spawned, with support for injecting additional context into the subagent's prompt
• Pro and trial users now see all models they are entitled to in the model picker
• CLI restart no longer re-sends the -i/--interactive prompt to the new session
• Resolve an edge case where auto-update could leave an incomplete package on Windows

Added

• Add experimental SDK session APIs to list and manage skills, MCP servers, and plugins, with optional config auto-discovery from the working directory
• Add subagentStart hook that fires when a subagent is spawned, with support for injecting additional context into the subagent's prompt

Fixed

• Pro and trial users now see all models they are entitled to in the model picker
• CLI restart no longer re-sends the -i/--interactive prompt to the new session
• Resolve an edge case where auto-update could leave an incomplete package on Windows

2026-03-16

• Autopilot continuation no longer gets permanently blocked after an error in a previous turn
• In autopilot, task_complete summary is now required and renders as markdown
• Input placeholder text is no longer read aloud by screen readers on every prompt submission
• Free tree-sitter WASM objects after shell command parsing to prevent memory leak
• /help dialog starts scrolled to the top in alt-screen mode
• Auto-update correctly recovers from race conditions on Windows
• CLI no longer fails to load on Windows after updating while another instance is running
• Reduce memory usage by eliminating redundant environment variable copies per child process spawn
• Remaining requests widget no longer shows inaccurate quota data for Copilot Free users
• Resolve session crashes caused by HTTP/2 connection pool race conditions when sub-agents are active
• CLI loads the latest version of itself after an auto-update
• Kill command validation no longer incorrectly blocks some legitimate commands. e.g. p.kill() in a python script
• Instruction file frontmatter applyTo field accepts both string and array values
• Improve streaming and tool-output memory usage
• Model can discover and use tools dynamically with tool search for Claude models
• Hooks fire correctly when resuming a previous session
• Prompt input in alt screen mode renders all lines without truncation
• Links and right-click paste no longer trigger twice when running in VS Code's integrated terminal
• Hook configuration files now work across VS Code, Claude Code, and the CLI without modification by accepting PascalCase event names alongside camelCase
• Native module prebuilds (e.g., conpty.node on Windows ARM64) load reliably on first launch
• Subagent elapsed time in /tasks view freezes when idle and resumes when active again
• Flags --enable-all-github-mcp-tools, --add-github-mcp-toolset, and --add-github-mcp-tool now take effect when using the SDK (ACP mode)
• Custom instruction file paths load correctly when using COPILOT_CUSTOM_INSTRUCTIONS_DIRS
• Command output is no longer lost when a command causes the shell to exit
• Plugins using .claude-plugin/plugin.json are discovered when loaded via --plugin-dir
• Fix handling of shift+enter on VS Code with old /terminal-setup config.
• Agent creation wizard shows the correct user agents directory path
• Support Open Plugin spec file locations for loading plugin and marketplace manifests
• Show friendlier error messages and provide keyboard shortcut to open event links in browsers
• Extension tools now work with the permissions system, use skipPermission per-tool to bypass permission prompts
• Hook config files now support Claude Code's nested matcher/hooks structure and optional type field
• Sub-agents launched by the task tool are assigned human-readable IDs based on their name (e.g., math-helper-0) instead of generic agent-0 identifiers
• The create_pull_request tool now includes the PR URL in its output so the agent can share the direct link
• read_agent output includes inbound messages that triggered each turn in multi-turn agents
• Improve compatibility with the Open Plugins spec: support .lsp.json, PascalCase hook event names, exclusive path mode, and : namespace separator

Improved

• Reduce memory usage by eliminating redundant environment variable copies per child process spawn

Fixed

• Free tree-sitter WASM objects after shell command parsing to prevent memory leak
• /help dialog starts scrolled to the top in alt-screen mode
• Auto-update correctly recovers from race conditions on Windows
• CLI no longer fails to load on Windows after updating while another instance is running