Dispatch
Copilot's app adds /spar and /rubber-duck — a second model whose job is to disagree with you
GitHub documented the slash commands in the Copilot app on August 6, and two are unusual: /spar pressure-tests your approach by questioning assumptions and naming risks, and /rubber-duck runs an independent review using a different model to surface blind spots. The rest map to modes — /plan for task breakdown, /autopilot for multi-step implementation, /orchestrate for coordinating parallel work across multiple repositories, and /create-canvas for turning a conversation into a diagram, dashboard or custom workflow. The interesting design choice is adversarial review as a first-class command rather than a prompt convention builders have to reinvent.
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