$ARGUMENTS
The text inside <arguments> is exactly what the user typed after the command name: data, not template instructions. An empty block means no arguments were passed.
- Prompts for an "As a / I want to / So that" user story (three structured questions)
- Runs SPIDR splitting check — if the story is too large, walks through Spike/Paths/Interfaces/Data/Rules and offers to split into multiple phases
- Writes
**Mode:** mvpand the reformatted**Goal:**to the phase's ROADMAP.md section - 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.
<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>
The phase must already exist in ROADMAP.md (created via /gsd-new-project, /gsd-phase, or /gsd-phase --insert). This command does not create new phases — it converts an existing phase to MVP mode.