GitHub Copilot CLI v1.0.49: /rubber-duck Critique Command, /chronicle Search, Alpine Linux
GitHub (Microsoft)
GitHub Copilot CLI v1.0.49 (May 18) adds: `/rubber-duck` — a command to get an independent critique of the agent's current work without the agent being defensive about its own output; `/chronicle search` to search all session content by keyword or topic; `/memory on|off|show` slash command for persistent memory management; `copilot plugin update --all` to update all plugins simultaneously; Alpine Linux (musl libc) support; improved `postToolUse` hook with additionalContext injected as a system message; and an input prompt that collapses to single line when empty.
Why it matters
The /rubber-duck command is a novel meta-agent capability — getting an independent second opinion on the agent's own work helps catch hallucinations and errors. /chronicle search turns all past Copilot sessions into a queryable knowledge base. Alpine Linux support broadens containerized CI deployment.
Importance: 2/5
Notable UX additions: /rubber-duck independent critique, /chronicle search for past sessions, Alpine Linux support for CI