Copilot CLI v0.0.422: GPT-5.4 & UX Fixes

TL;DR

• GPT-5.4 model support added
• Plugin cache auto-recovery and improved error messages for missing git
• Major UX fixes: text selection persistence, scroll stability, reverse history search (Ctrl+R), and mouse scroll in diff mode
• Config file renamed from .github/copilot/config.json to settings.json

New

• GPT-5.4 model support — Copilot CLI now supports the latest GPT-5.4 model
• Reverse history search — Press Ctrl+R to search command history like Bash (Ctrl+J to accept, Ctrl+G to cancel)
• /copy command — Copy the last response to clipboard directly from the CLI
• copy_on_select config option — Auto-copy selected text to clipboard in alt-screen mode
• Mouse scroll in diff mode — Add mouse scroll support to /diff in alt-screen mode
• --output-format json flag — Emit JSONL in prompt mode for programmatic integrations
• Startup prompt hooks — Auto-submit prompts or slash commands when a session starts
• enabledPlugins config — Automatic plugin installation at startup
• SSH plugin URLs — Support installing plugins from ssh:// URLs
• Session metrics persistence — Usage metrics (requests, tokens, code changes) now saved to events.jsonl after each session

Fixed

• Plugin cache auto-recovery — Automatically recovers from corrupted or incomplete clones without manual intervention
• Text selection persistence — Selected text now persists after copying to clipboard in alt-screen mode
• Scroll stability — Scroll view no longer jumps to earlier messages when scrolling during response streaming or with popups open
• Memory usage in alt-screen — Reduced memory consumption for long sessions
• Git color.diff handling — Diff mode now works correctly when git color.diff=always is configured
• Windows URL handling — Opening links on Windows correctly handles URLs with & query parameters
• File completion accuracy — @-mention file completion always reflects current working directory state
• Terminal compatibility — ESC key to cancel works correctly in tmux and non-kitty terminals
• Cursor repositioning — Click in the prompt input to reposition the text cursor
• CJK input support — IME candidate windows appear at correct cursor position
• Link visibility — Links in alt-screen mode rendered with underline styling
• Markdown table rendering — Colons in inline code render correctly inside markdown tables
• Help dialog dismissal — Pressing Ctrl+C on the help dialog now dismisses it cleanly
• Enum field selection — Pressing Enter in required enum field now selects the highlighted option
• Diff line wrapping — Long diff lines no longer overflow and wrap in the diff view
• Ctrl+K line joining — Ctrl+K joins lines when cursor is at end of line, matching Emacs/terminal behavior
• Escape sequence handling — Escape sequences split across input chunks no longer leak into text input
• Large directory handling — CLI no longer hangs for minutes when working in directories with many files

Improved

• Git not installed error — Clear, actionable error message when git is not installed and a remote plugin or marketplace is used
• Authentication errors — Display request ID in authentication and authorization error messages to aid troubleshooting
• Personal hooks loading — Load personal hooks from ~/.copilot/hooks in addition to repo-level .github/hooks
• Timeline display — Timeline now shows the question in a box and displays 'Making best guess on autopilot' when ask_user is auto-responded
• LSP server loading — Plugin-contributed LSP servers are now loaded, started, and shown in /lsp show
• MCP server tracking — GitHub MCP server connection status accurately tracked and counted in status indicator
• Multi-remote delegation — /delegate prompts for a target remote in multi-remote repositories with clarified confirmation text
• Azure DevOps compatibility — GitHub MCP server stays enabled in repositories with both Azure DevOps and GitHub remotes
• Timeline noise reduction — Hide noisy todo bookkeeping queries and show dependency details in timeline
• External editor feedback — Show a waiting message when the terminal is handed to an external editor

Breaking Changes

• Config file location — Repository config renamed from .github/copilot/config.json to settings.json. Update your configuration file paths accordingly.
• launch_messages setting — Renamed to companyAnnouncements. Update any scripts or automation that reference the old setting name.

Update with: npm install -g @github/copilot-cli@0.0.422 or check the release page for other installation methods.

Source: Copilot CLI