Gsd Mvp Phase

---
name: gsd-mvp-phase
description: "Plan a phase as a vertical MVP slice — user story, SPIDR splitting, then plan-phase"
argument-hint: "<phase-number>"
allowed-tools:
  - Read
  - Write
  - Bash
  - Glob
  - Grep
  - Agent
  - AskUserQuestion
---

<objective>
Guide the user through MVP-mode planning for a phase. The command:

1. Prompts for an "As a / I want to / So that" user story (three structured questions)
2. Runs SPIDR splitting check — if the story is too large, walks through Spike/Paths/Interfaces/Data/Rules and offers to split into multiple phases
3. Writes `**Mode:** mvp` and the reformatted `**Goal:**` to the phase's ROADMAP.md section
4. Delegates to `/gsd plan-phase <N>` which auto-detects MVP mode via the roadmap field

Phase 1 of the vertical-mvp-slice PRD shipped the planner-side machinery; this command is the user entry point for it.
</objective>

<execution_context>
@~/.claude/gsd-core/workflows/mvp-phase.md
@~/.claude/gsd-core/references/spidr-splitting.md
@~/.claude/gsd-core/references/user-story-template.md
</execution_context>

<runtime_note>
**Copilot (VS Code):** Use `vscode_askquestions` wherever this workflow calls `AskUserQuestion`. Equivalent API.
</runtime_note>

<context>
Phase number: $ARGUMENTS (required — integer or decimal like `2.1`)

The phase must already exist in ROADMAP.md (created via `/gsd new-project`, `/gsd add-phase`, or `/gsd insert-phase`). This command does not create new phases — it converts an existing phase to MVP mode.
</context>

<process>
Execute the mvp-phase workflow from @~/.claude/gsd-core/workflows/mvp-phase.md end-to-end.
Preserve all gates: phase existence, status guard (refuse in_progress/completed), user-story format validation, SPIDR splitting check, ROADMAP write confirmation, plan-phase delegation.
</process>