1.0.42-0

Added

• Add rubber-duck agent for GPT sessions, powered by Claude (available in /experimental)

1.0.41

2026-05-05

• CLI starts faster by rendering the UI immediately while authentication resolves in the background
• Shell completions (bash, zsh, fish) are automatically installed on first run and updated after copilot update
• Tab-completing slash commands that accept arguments now adds a trailing space automatically
• Package extraction no longer crashes on Windows when antivirus or filesystem locks cause transient EPERM errors
• Remote session connection errors show your logged-in account and tailored remediation steps
• Markdown formatting renders in ask user prompt questions
• Add experimental MCP Tasks support: MCP tools with taskSupport: "required" run as non-blocking background agents trackable via list_agents and read_agent (available when experimental mode is enabled, e.g. via /experimental on or the --experimental flag)
• Extensions now load in prompt mode (-p). User extensions load by default; project extensions alnd management tools require GITHUB_COPILOT_PROMPT_MODE_EXTENSIONS=true.
• Assistant responses no longer contain spurious system notification XML tags
• Large output guidance correctly references the configured grep tool name
• Adding a plugin marketplace using a git SSH URL (e.g. git@github.com:owner/repo) now works correctly
• Slash command picker searches command descriptions and underlines matched characters
• Memory tool confirmation prompt now shows the scope (repository or user) when requesting permission to store a memory
• SQL todo timeline entries display more accurately for INSERT OR IGNORE/REPLACE and blocked status updates
• Streaming text and shimmer animations stay smooth on slow or busy hosts
• Add --attachment flag in non-interactive (-p/--prompt) mode to attach files (images or native documents) to the initial prompt
• @-mention completion works for ./ paths, no longer adds trailing space on directories, and shows project files before workspace roots
• Improve stability on Windows by working around a V8 crash in Node 24.x
• Session files containing Unicode line separator characters load correctly
• Reasoning effort picker hint text displays "Esc to cancel" with correct spacing
• Improve reliability of file edits by better recovering from fuzzy or misaligned edit blocks

1.0.41-1

Improved

• Slash command picker searches command descriptions and underlines matched characters
• Memory tool confirmation prompt now shows the scope (repository or user) when requesting permission to store a memory
• SQL todo timeline entries display more accurately for INSERT OR IGNORE/REPLACE and blocked status updates
• Streaming text and shimmer animations stay smooth on slow or busy hosts

Fixed

• Extensions now load in prompt mode (-p). User extensions load by default; project extensions alnd management tools require GITHUB_COPILOT_PROMPT_MODE_EXTENSIONS=true.
• Assistant responses no longer contain spurious system notification XML tags
• Large output guidance correctly references the configured grep tool name
• Adding a plugin marketplace using a git SSH URL (e.g. git@github.com:owner/repo) now works correctly

1.0.41-0

Added

• Add --attachment flag in non-interactive (-p/--prompt) mode to attach files (images or native documents) to the initial prompt

Improved

• Improve reliability of file edits by better recovering from fuzzy or misaligned edit blocks

Fixed

• @-mention completion works for ./ paths, no longer adds trailing space on directories, and shows project files before workspace roots
• Improve stability on Windows by working around a V8 crash in Node 24.x
• Session files containing Unicode line separator characters load correctly
• Reasoning effort picker hint text displays "Esc to cancel" with correct spacing

1.0.40

2026-05-01

• PR branch decoration displays correctly in the footer regardless of model name length
• /clear and /new reset the active custom agent selection
• Assistant responses stream with smoother text output
• copilot plugin list shows the correct version after running copilot plugin update
• Add support for client_credentials OAuth grant type for MCP servers, enabling fully headless authentication without a browser
• Subagents correctly evaluate tool search support for their own model instead of inheriting the parent session's settings
• Switching sessions with /new or /resume no longer carries over pending messages to the new session
• CLI no longer hangs at 100% CPU when sending a large file attachment
• Resume session picker no longer shows duplicate entries for the same Mission Control-backed session
• Session resume selector displays summaries on a single line, truncated to fit the column width
• Print "Exiting…" to stderr immediately on Ctrl+C during prompt mode so shutdown progress is visible
• /research uses an orchestrator/subagent model for more thorough and reliable deep research results
• Autopilot mode now limits continuation messages to 5 by default (configurable with --max-autopilot-continues)
• Automatically clean up old CLI package versions from disk during auto-update
• Remote session statusline shows the remote working directory and branch instead of local context
• /update no longer re-submits the original -i prompt after restarting
• Detect Azure DevOps repositories and auto-disable the GitHub MCP server
• Session history, file tracking, and the /chronicle command are now available to all users
• Skills are available as slash commands in ACP clients, matching the CLI experience
• Resuming a session no longer falsely reports it as in use after a previous CLI process exited unexpectedly
• --config-dir now propagates correctly to plugin subcommands; --config-dir is deprecated in favor of COPILOT_HOME
• Mouse selection works while the /ask response dialog is open, so its content can be highlighted and copied
• Improve CLI startup speed by loading custom CA certificates asynchronously
• Remote control link shows the full URL in the timeline instead of 'Open in browser'
• ACP clients (e.g. Zed) now display the agent's live plan as it works through multi-step tasks
• Add toggle for custom statusLine.command visibility in the statusline picker
• ACP clients can now list and switch custom agents via the agent config option
• MCP OAuth tokens cache correctly when multiple servers share the same URL but use different static OAuth client IDs
• MCP tool names with dots or other invalid characters are now sanitized correctly
• Ctrl+C and double-Esc remove pending queued messages one at a time instead of all at once
• Slash command suggestions rank prefix matches above fuzzy matches
• Prompt mode (-p) now gates repo hooks and workspace MCP behind opt-in env vars (GITHUB_COPILOT_PROMPT_MODE_REPO_HOOKS and GITHUB_COPILOT_PROMPT_MODE_WORKSPACE_MCP) for secure-by-default behavior

1.0.40-3

Added

• Add support for client_credentials OAuth grant type for MCP servers, enabling fully headless authentication without a browser

Improved

• Print "Exiting…" to stderr immediately on Ctrl+C during prompt mode so shutdown progress is visible
• /research uses an orchestrator/subagent model for more thorough and reliable deep research results
• Autopilot mode now limits continuation messages to 5 by default (configurable with --max-autopilot-continues)
• Automatically clean up old CLI package versions from disk during auto-update
• Remote session statusline shows the remote working directory and branch instead of local context

Fixed

• Subagents correctly evaluate tool search support for their own model instead of inheriting the parent session's settings
• Switching sessions with /new or /resume no longer carries over pending messages to the new session
• CLI no longer hangs at 100% CPU when sending a large file attachment
• Resume session picker no longer shows duplicate entries for the same Mission Control-backed session
• Session resume selector displays summaries on a single line, truncated to fit the column width

1.0.40-2

Fixed

• /update no longer re-submits the original -i prompt after restarting

1.0.40-1

Added

• Detect Azure DevOps repositories and auto-disable the GitHub MCP server
• Session history, file tracking, and the /chronicle command are now available to all users
• Skills are available as slash commands in ACP clients, matching the CLI experience

Improved

• Improve CLI startup speed by loading custom CA certificates asynchronously
• Remote control link shows the full URL in the timeline instead of 'Open in browser'
• ACP clients (e.g. Zed) now display the agent's live plan as it works through multi-step tasks
• Add toggle for custom statusLine.command visibility in the statusline picker

Fixed

• Resuming a session no longer falsely reports it as in use after a previous CLI process exited unexpectedly
• --config-dir now propagates correctly to plugin subcommands; --config-dir is deprecated in favor of COPILOT_HOME
• Mouse selection works while the /ask response dialog is open, so its content can be highlighted and copied

1.0.40-0

Added

• ACP clients can now list and switch custom agents via the agent config option

Improved

• Ctrl+C and double-Esc remove pending queued messages one at a time instead of all at once
• Slash command suggestions rank prefix matches above fuzzy matches
• Prompt mode (-p) now gates repo hooks and workspace MCP behind opt-in env vars (GITHUB_COPILOT_PROMPT_MODE_REPO_HOOKS and GITHUB_COPILOT_PROMPT_MODE_WORKSPACE_MCP) for secure-by-default behavior

Fixed

• MCP OAuth tokens cache correctly when multiple servers share the same URL but use different static OAuth client IDs
• MCP tool names with dots or other invalid characters are now sanitized correctly

1.0.39

2026-04-28

• Allow ACP clients to toggle allow-all permission mode via session configuration
• Add /compact, /context, /usage, and /env slash commands for ACP sessions
• Press ctrl+x → b to move the current running task or shell command to the background
• Transient pipe errors on child process stdio streams no longer cause crashes or trigger false crash reports
• /remote status output now shows actionable hints for each connection state
• Improve --resume session picker with better tab layout, status display, and progressive loading
• Slash command argument picker opens immediately at exact command boundaries without requiring a trailing space