GitHub Copilot CLI v1.0.59

GitHub Copilot CLI v1.0.59 was released on .

Summary

2026-06-02 - Actionable error message shown when GitHub API rate limit is hit during copilot update - Add /rubber-duck command for adversarial feedback on code and designs - Plugin slash commands (...

Release Context

  • This was the 102nd GitHub Copilot CLI release of 2026 tracked by Havoptic.
  • It shipped the same day as GitHub Copilot CLI v1.0.58 (June 2, 2026).

Shipped around the same time

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Release Notes

2026-06-02 - Actionable error message shown when GitHub API rate limit is hit during copilot update - Add /rubber-duck command for adversarial feedback on code and designs - 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 - Add the /voice command to dictate prompts using local speech-to-text models - COPILOTHOME is honored for the server discovery registry directory

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