GitHub Copilot CLI v1.0.57

GitHub Copilot CLI v1.0.57 was released on .

Summary

2026-06-01 - Actionable error message shown when GitHub API rate limit is hit during copilot update - Plugin slash commands (/plugin install, uninstall, update, marketplace add/remove/browse) now s...

Release Context

  • This was the 100th GitHub Copilot CLI release of 2026 tracked by Havoptic.
  • It shipped 3 days after GitHub Copilot CLI v1.0.56 (May 29, 2026).

Shipped around the same time

Within 3 days of this release, other AI coding tools also shipped:

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Release Notes

2026-06-01 - Actionable error message shown when GitHub API rate limit is hit during copilot update - Plugin slash commands (/plugin install, uninstall, update, marketplace add/remove/browse) now show immediate feedback while the operation is in progress - Canceling a running shell command (Ctrl+C on a !command, or aborting an agent command — including in sandboxed and background-promoted shells) now terminates the whole process tree instead of leaving orphaned processes running - Canvas providers can return file:// URLs in open results for local file previews - Symlinked directories appear in /cwd completion suggestions - In Azure DevOps-only repositories, the built-in GitHub MCP server now exposes only the websearch tool instead of being fully disabled - Quota footer shows remaining requests as a rounded percentage - /lsp show, /lsp test, and /lsp reload correctly discover project LSP config when the CLI is launched from a subdirectory - MCP server timeout configuration is preserved after tools list changes - /skills add and /skills remove correctly handle paths wrapped in quotes (e.g., from Windows Explorer "Copy as path") - Running copilot with an unquoted multi-word prompt now shows a helpful "quote your prompt" hint instead of a raw commander error - Default networking transport is now HTTP/1.1, improving reliability on some network paths. Opt into HTTP/2 with COPILOTENABLEHTTP2=1. - Plugins auto-installed from repository settings no longer leak into user global config - Grep tool correctly handles tsx and jsx as file type filters - COPILOTHOME is honored for the server discovery registry directory - Click a diff line with the mouse to select it in diff mode - Ctrl+C and other modified keys work correctly inside tmux - @-mention file search matches files regardless of query letter casing - copilot plugin marketplace list now honors repo-level extraKnownMarketplaces settings from .github/copilot/settings.json - Queued prompts in the footer are capped to a single line, preventing them from pushing session messages off screen - MCP servers configured with npx --registry are no longer incorrectly blocked by policy - Session no longer hangs indefinitely after an error occurs during internal event processing - Installed plugins no longer include the .git directory from the plugin source repository - New reasoning after tool calls appears at the bottom of the timeline instead of above earlier output - Pasting text copied from a browser, editor, or terminal no longer leaves a stray empty line, broken box-drawing lines, or a misplaced cursor in the prompt - preToolUse hook errors now deny the tool call instead of silently allowing execution - Session resume works correctly after a crash that left partial data in the session log - High-contrast diff backgrounds use darker colors to improve text readability - Add showTipsOnStartup setting to control whether startup tips are shown - Surface the underlying reason (e.g. GitHub API rate limit) when SDK auth-token validation fails, instead of the misleading "Session was not created with authentication info or custom provider" message. - /diff defaults to branch diff when there are no unstaged changes

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