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gsd-mvp-phase

Convert a user story into a validated MVP-mode roadmap phase.

Updated May 21, 2026
Search Tags:#product discovery#phase planning#user story#vertical slice#mvp planning#spidr splitting#roadmap update
One-click install
npx skills add https://github.com/jedmamosto/m-and-ms --skill gsd-mvp-phase
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: gsd-mvp-phase
Source: https://github.com/jedmamosto/m-and-ms/tree/main/.agents/skills/gsd-mvp-phase
Command: npx skills add https://github.com/jedmamosto/m-and-ms --skill gsd-mvp-phase

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

It turns a rough MVP idea into a validated, properly structured phase plan, reducing the risk of building the wrong slice or an overly large “phase” that should be split.

Core Features & Use Cases

  • User-story-first phase planning: Prompts for a clean “As a / I want to / So that” user story using structured questions, ensuring the goal is clear and testable.
  • SPIDR splitting guardrail: Checks whether the story is too large and, when needed, walks through Spike/Paths/Interfaces/Data/Rules to help you split into multiple phases.
  • Roadmap MVP mode + delegation: Writes the phase as Mode: mvp and updates the phase Goal, then delegates to the phase planner so the plan is generated in MVP mode.

Quick Start

Run the command /gsd mvp-phase 2 after making sure phase 2 already exists in ROADMAP.md.

Frequently Asked Questions about gsd-mvp-phase

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I plan an MVP slice from a user story?▼

MVP phase planning converts a user story into validated roadmap content by checking scope with SPIDR splitting, writing Mode: mvp to the roadmap, and delegating to a phase planner for execution.

What is SPIDR splitting and when do I need it for MVP planning?▼

SPIDR splitting analyzes Spike, Paths, Interfaces, Data, and Rules to break down overly large user stories into multiple manageable MVP phases, preventing bloated scope during product discovery.

How do I validate if my user story is too large for a single MVP phase?▼

Validate story scope by applying a SPIDR splitting guardrail, which checks the user-story format and walks through Spike/Paths/Interfaces/Data/Rules to determine if the phase requires splitting.

Do I need an existing roadmap phase before planning a vertical MVP slice?▼

Yes, MVP phase planning requires a phase to already exist in ROADMAP.md with proper status guards before it can write the Mode and Goal updates for the vertical slice.

What's the best way to structure a user story for MVP mode roadmap updates?▼

Structure the user story using the “As a / I want to / So that” format to ensure the goal is clear and testable, which allows the roadmap to properly update Mode: mvp and the phase Goal.

Why does my MVP phase planning fail when the user story format is invalid?▼

MVP phase planning fails without user-story format validation because it relies on a clean “As a / I want to / So that” structure to generate the phase plan and write roadmap updates correctly.

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