GitHub has introduced an experimental Rubber Duck mode in the GitHub Copilot CLI. The latest addition to the AI-powered coding tool uses a second model from a different AI family to provide a second opinion before enacting the agent’s plan.
The new feature was announced April 6. Introduced in experimental mode, Rubber Duck leverages a second model from a different AI family to act as an independent reviewer, assessing plans and work at the moments where feedback matters most, according to GitHub. Rubber Duck is a focused review agent, powered by a model from a complementary family to a primary Copilot session. The job of Rubber Duck is to check the agent’s work and present a short, focused list of high-value concerns including details the primary agent may have missed, assumptions worth questioning, and edge cases to consider.
Developers can use/experimentalin the Copilot CLI to access Rubber Duck alongside other experimental features.
