Refines a rough instruction into a structured Agent Task Prompt before another agent executes. Use when the user is about to delegate work to a subagent, Codex CLI, Cursor, or another coding agent and wants a clear, complete brief with goal, context, files to inspect, constraints, deliverables, verification, and edge cases. Triggers - "/refine", "refine this prompt", "make this prompt better", "brief an agent", "structure this before running", "improve my instruction".