Plan a Phased Build

Original name

Original description

Splits a body of context into a sequence of vertical-slice build phases where each phase is independently demonstrable to a real user and each builds on the work of the previous. Use when the user wants to plan, sequence, phase, slice, break down, or order the build of a feature, capability, system, or initiative — including requests like "split this into phases", "what should we build first", "create a build plan", "phase this work", "turn this into vertical slices", "outline the order of delivery", or "what's our roadmap". Accepts any source of context — gap analyses, PRDs, design documents, feature specifications, conversation notes, ADRs, requirements lists, or inline descriptions — and produces a plain-language `build-phase-outline.md` indexed by stable phase IDs. Each phase explains what gets built, why it lands at that position, the outcome a real person can be shown end-to-end, cross-references back to the source artifact for traceability, and preconditions. Foundational or prerequisite phases appear first only when dependencies require them; feature work otherwise sequences for earliest demoable value. The information-architect reviews the rendered document so the result is findable, scannable, and builds comprehension progressively. Does not produce implementation detail — use plan-implementation. Does not specify behavior that has not yet been decided — use plan-a-feature. Does not perform gap analysis between two artifacts — use gap-analysis. Does not record architectural decisions — use architectural-decision-record. Does not refine an existing plan — use iterative-plan-review.