What problem does it solve? Turning a vague or ambitious idea into a buildable specification is hard: scope is unclear, assumptions go untested, and planning agents end up inventing product behavior. This Skill runs a structured brainstorming dialogue that resolves product decisions up front and records them in a durable requirements-only unified plan under docs/plans/. ## Core Features & Use Cases - Scoped collaborative dialogue: Classifies work as Lightweight, Standard, or Deep, then asks one question at a time using the platform's blocking question tool to clarify problem, users, constraints, and success criteria. - Grounding and rigor passes: Scans the repository (with a cached repo profile and a grounding-scout subagent), pressure-tests the product framing, and offers blindspot maps or visual probes when the user faces unfamiliar or visual territory. - Requirements-only plan artifact: Writes a unified plan (markdown or HTML) with Goal Capsule, Product Contract, stable R-IDs, and metadata that ce-plan later enriches into an implementation plan. - Use Case: A user says "I'm mulling a canvas annotation feature but know nothing about the drawing code." The Skill maps the unfamiliar territory, probes scope and actors, then produces a requirements-only plan ready to hand off to ce-plan or an autonomous lfg pipeline. ## Quick Start Ask the AI to brainstorm your feature idea, for example: "Use ce-brainstorm to explore adding a highlighter tool to the editor."