mvp-design

mvp-design is a skill for Claude Code, Codex from Dqz00116/skill-lib. It costs 23 tokens per session (1,334 once invoked), scanned A, original, MIT.

A planning method for designing a minimal viable prototype, meaning the smallest useful first version of a system, before implementing it.

In plain words
What is it for?
Use it to plan new modules or subsystems, replacement systems, coding patterns, and small prototypes with readable code and limited scope.
Why use it?
It helps keep new modules focused while making architecture, interfaces, and important design decisions clear.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to plan new modules or subsystems, replacement systems, coding patterns, and small prototypes with readable code and limited scope.

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Install with agentmods
npx agentmods add skills/dqz00116/skill-lib/mvp-design
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add Dqz00116/skill-lib --skill mvp-design
Clone the repo
git clone --depth 1 https://github.com/Dqz00116/skill-lib

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for mvp-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/dqz00116/skill-lib/mvp-design/github.svg)](https://agentmods.dev/skills/dqz00116/skill-lib/mvp-design)
Your own site
<a href="https://agentmods.dev/skills/dqz00116/skill-lib/mvp-design"><img src="https://agentmods.dev/badge/skills/dqz00116/skill-lib/mvp-design/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for mvp-design

Your own site · 80×15
<a href="https://agentmods.dev/skills/dqz00116/skill-lib/mvp-design"><img src="https://agentmods.dev/badge/skills/dqz00116/skill-lib/mvp-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,334 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00023 $0.01334
Opus 5 $0.00012 $0.00667
Sonnet 5 $0.00005 $0.00267
Haiku 4.5 $0.00002 $0.00133

Measured 9d ago against content hash b5661ee9fe59, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

mvp-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

mvp-design/SKILL.md · 226 lines

How it starts

The opening of the file, as written. The whole thing — 226 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MVP Design Skill

Overview

This skill guides the design of minimal, production-ready code prototypes with clear architecture and self-documenting code, emphasizing design decisions over implementation details.

Design minimal, production-ready code prototypes with clear architecture and self-documenting code.

When to Use

Use this skill when you need to:

  • Design a new module or subsystem from scratch
  • Create a minimal viable prototype (MVP) for rapid iteration
  • Establish coding patterns and architectural decisions
  • Plan implementation before writing actual code
  • Design replacement systems alongside existing ones

Core Principles

1. Code as Documentation

  • Code itself is readable - clear naming, simple structure
  • Minimal comments - code explains itself
  • Self-documenting functions - verb-based naming, obvious parameters

2. Documentation as Design

  • No code in documentation - code lives in the project
  • Document "why", not "how" - architectural decisions and rationale
  • Focus on design patterns - data flow, component interaction
  • Interface contracts - what goes in, what comes out

3. Minimal Viable Scope

  • 5-6 files maximum - forces focus on essentials
  • 500 lines of code - small enough to complete quickly
  • Core functionality only - defer edge cases to later phases

4. Architectural Alignment

  • Use existing infrastructure - leverage project's patterns
  • Follow established conventions - naming, structure, serialization
  • Zero-intrusive design - parallel development, not replacement

Workflow

Phase 1: Architecture Definition

  1. Identify Core Data Structure

    • What is the fundamental entity?
    • Example: MissionInstance (id, kind, status, progress, target)
  2. Define Primary Operations

    • What actions can be performed?
    • Example: Participate, AddProgress, AcceptReward
  3. Map Infrastructure Dependencies

    • What existing systems to leverage?
    • Example: Tinker serialization, SharedTable config, NetMessage

Read the full file on GitHub · 226 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 226 lines · 23 tokens per session scan A b5661ee9fe59

Subscribe to this mod's changes

mvp-design is a skill published in the GitHub repository Dqz00116/skill-lib (22 stars, last pushed 3mo ago), licensed MIT. It adds 23 tokens to every session and 1,334 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.