---
namespace: hm
agent: hm-planner
subtask: true
description: "Plan a phase as a vertical MVP slice — user story, SPIDR splitting, then plan-phase"
argument-hint: "<phase-number>"
requires: ["hm-new-project", "hm-phase", "hm-plan-phase"]
validation-gates: ["spec-compliance-gate"]
output-templates: ["hm-plan.md"]
coordination-model: "waiter-model"
completion-signals: ["mvp-plan-defined"]
tools:
  read: true
  write: true
  bash: true
  glob: true
  grep: true
  agent: true
  question: true
---

<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 `/hm 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>
@/Users/apple/hivemind-plugin-private/.opencode/workflows/hm-mvp-phase.md
@/Users/apple/hivemind-plugin-private/.opencode/references/hm-spidr-splitting.md
@/Users/apple/hivemind-plugin-private/.opencode/references/hm-user-story-template.md
</execution_context>

<runtime_note>
**Copilot (VS Code):** Use `vscode_askquestions` wherever this workflow calls `question`. 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 `/hm new-project`, `/hm add-phase`, or `/hm 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 @/Users/apple/hivemind-plugin-private/.opencode/workflows/hm-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>