Bump @github/copilot from 0.0.400 to 0.0.421 in /test/harness

[dependabot]

Bumps @github/copilot from 0.0.400 to 0.0.421.

Release notes

Sourced from @​github/copilot's releases.

0.0.421

2026-03-03

• Autopilot permission dialog appears on first prompt submission instead of on mode switch
• AUTO theme now reads your terminal's ANSI color palette and uses it directly, so colors match your terminal theme
• Add structured form input for the ask_user tool using MCP Elicitations (experimental)
• Plugin commands read extraKnownMarketplaces from project-level .claude/settings.json for Claude compatibility
• Git hooks can detect Copilot CLI subprocesses via the COPILOT_CLI=1 environment variable to skip interactive prompts
• Spurious "write EIO" error entries no longer appear in the timeline during session resume or terminal state transitions
• Python-based MCP servers no longer time out due to buffered stdout
• Error when --model flag specifies an unavailable model
• MCP server availability correctly updates after signing in, switching accounts, or signing out
• Display clickable PR reference next to branch name in the status bar
• Add --plugin-dir flag to load a plugin from a local directory
• Mouse text selection is automatically copied to the Linux primary selection buffer (middle-click to paste)
• Fix VS Code shift+enter and ctrl+enter keybindings for multiline input
• Use consistent ~/.copilot/pkg path for auto-update instead of XDG_STATE_HOME
• ACP clients can configure reasoning effort via session config options
• Click links in the terminal to open them in your default browser
• Support repo-level config via .github/copilot/config.json for shared project settings like marketplaces and launch messages
• Streaming output no longer truncates when running in alt-screen mode
• Right-click paste no longer produces garbled text on Windows
• Shell command output on Windows no longer renders as "No changes detected" in the timeline
• GitHub API errors no longer appear as raw HTTP messages in the terminal when using the # reference picker
• Markdown tables render with proper column widths, word wrap, and Unicode borders that adapt to terminal width
• MCP elicitation form displays taller multi-line text input, hides tab bar for single-field forms, and fixes error flashing on field navigation

0.0.421-2

Added

• Add structured form input for the ask_user tool using MCP Elicitations (experimental)
• Add --plugin-dir flag to load a plugin from a local directory
• Mouse text selection is automatically copied to the Linux primary selection buffer (middle-click to paste)

Improved

• Autopilot permission dialog appears on first prompt submission instead of on mode switch
• AUTO theme now reads your terminal's ANSI color palette and uses it directly, so colors match your terminal theme
• Plugin commands read extraKnownMarketplaces from project-level .claude/settings.json for Claude compatibility
• Use consistent ~/.copilot/pkg path for auto-update instead of XDG_STATE_HOME

Fixed

• Git hooks can detect Copilot CLI subprocesses via the COPILOT_CLI=1 environment variable to skip interactive prompts
• Spurious "write EIO" error entries no longer appear in the timeline during session resume or terminal state transitions
• Python-based MCP servers no longer time out due to buffered stdout
• MCP server availability correctly updates after signing in, switching accounts, or signing out
• Fix VS Code shift+enter and ctrl+enter keybindings for multiline input

0.0.421-1

Improved

• AUTO theme now reads your terminal's ANSI color palette and uses it directly, so colors match your terminal theme

... (truncated)

Changelog

Sourced from @​github/copilot's changelog.

0.0.421 - 2026-03-03

• Autopilot permission dialog appears on first prompt submission instead of on mode switch
• AUTO theme now reads your terminal's ANSI color palette and uses it directly, so colors match your terminal theme
• Add structured form input for the ask_user tool using MCP Elicitations (experimental)
• Plugin commands read extraKnownMarketplaces from project-level .claude/settings.json for Claude compatibility
• Git hooks can detect Copilot CLI subprocesses via the COPILOT_CLI=1 environment variable to skip interactive prompts
• Spurious "write EIO" error entries no longer appear in the timeline during session resume or terminal state transitions
• Python-based MCP servers no longer time out due to buffered stdout
• Error when --model flag specifies an unavailable model
• MCP server availability correctly updates after signing in, switching accounts, or signing out
• Display clickable PR reference next to branch name in the status bar
• Add --plugin-dir flag to load a plugin from a local directory
• Mouse text selection is automatically copied to the Linux primary selection buffer (middle-click to paste)
• Fix VS Code shift+enter and ctrl+enter keybindings for multiline input
• Use consistent ~/.copilot/pkg path for auto-update instead of XDG_STATE_HOME
• ACP clients can configure reasoning effort via session config options
• Click links in the terminal to open them in your default browser
• Support repo-level config via .github/copilot/config.json for shared project settings like marketplaces and launch messages
• Streaming output no longer truncates when running in alt-screen mode
• Right-click paste no longer produces garbled text on Windows
• Shell command output on Windows no longer renders as "No changes detected" in the timeline
• GitHub API errors no longer appear as raw HTTP messages in the terminal when using the # reference picker
• Markdown tables render with proper column widths, word wrap, and Unicode borders that adapt to terminal width
• MCP elicitation form displays taller multi-line text input, hides tab bar for single-field forms, and fixes error flashing on field navigation

0.0.420 - 2026-02-27

• Auto-update now also updates the binary executable, not just the JS package
• Plugin and marketplace git repos update correctly after force-pushes and tag-based installs
• 502 bad gateway errors are retried automatically and no longer crash the session with raw HTML output
• Copy hint shows cmd+c in Ghostty on macOS and right-click as an alternative for all terminals
• Type # to reference GitHub issues, pull requests and discussions

0.0.419 - 2026-02-27

• Add /chronicle command with standup, tips, and improve subcommands powered by session history (experimental)
• Scrolling left or right no longer triggers unintended mouse button presses
• Add Ctrl+F/Ctrl+B as page down/up shortcuts for scrolling in alt-screen views
• Add --mouse/--no-mouse flag and mouse config to disable mouse mode in alt screen
• Home and End keys jump to the top and bottom of the alt-screen scroll buffer
• Add Ctrl+G keyboard shortcut for editing prompts in external editor and dismissing UI elements
• /mcp enable works for built-in servers that were auto-disabled before configuration
• CLI spinner stops and final agent response is visible after agent finishes work
• AUTO theme now uses the terminal's actual ANSI color palette for more accurate colors on any terminal theme
• MCP server env vars referenced in command, args, or cwd fields are automatically included in the server environment
• /diagnose shows a helpful message when no session has been started yet
• MCP server names now support dots, slashes, and @ characters, enabling npm-style names like @​modelcontextprotocol/server and io.github/server

0.0.418 - 2026-02-25

... (truncated)

Commits

• 119c6f8 Merge pull request #1699 from github/devm33/install-ready
• 3b73154 Update changelog.md for version 0.0.420
• 9596516 Update changelog.md for version 0.0.419
• 30034c7 install: guide user to update PATH for current shell session
• 9277ab5 Update changelog.md for version 0.0.418
• f8396ae Merge pull request #1670 from github/RyanHecht-patch-1
• b54e97c Update README.md
• aea9faa Revise README for GitHub Copilot CLI installation
• 6c3eff1 Update changelog.md for version 0.0.417
• b320dfb Update changelog.md for version 0.0.416
• Additional commits viewable in compare view

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[dependabot]

Superseded by #43.