GitHub Copilot CLI v1.0.42

GitHub Copilot CLI v1.0.42 was released on .

Summary

2026-05-06 - MCP server failure warning now suggests a directly runnable /mcp show command when the server name contains whitespace - MCP server failure warnings include stderr output to help diagn...

Release Context

  • This was the 86th GitHub Copilot CLI release of 2026 tracked by Havoptic.
  • It shipped 1 day after GitHub Copilot CLI v1.0.41 (May 5, 2026).

Shipped around the same time

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

Compare GitHub Copilot CLI: vs Claude Code · vs OpenAI Codex CLI · vs Cursor · vs Gemini CLI · vs Kiro CLI · vs Devin Desktop · vs Antigravity CLI

Release Notes

2026-05-06 - MCP server failure warning now suggests a directly runnable /mcp show command when the server name contains whitespace - MCP server failure warnings include stderr output to help diagnose connection errors - Add -C <directory> flag to change working directory before starting, similar to git -C - Exit message resume command shows session ID instead of auto-generated name when session has not been renamed - Remote session export now supports non-GitHub repositories and repo-less directories - Resuming a session no longer shows a false "session in use" warning after choosing "Go back" - Enter key no longer gets permanently stuck after cancelling a request - Suppress the exit summary when the session has no user messages and no saved session to resume - CLI updates on Windows no longer fail with ENOENT when a transient EPERM occurs during package extraction - Add rubber-duck agent for GPT sessions, powered by Claude (available in /experimental)

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