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devlyn:product-spec

Generate or update a build-ready product specification with YAML frontmatter.

4|Updated Feb 23, 2026
Search Tags:#requirements#feature planning#human-in-the-loop#product spec#MVP scoping#prD update#incremental editing
One-click install
npx skills add https://github.com/fysoul17/ian-on-v1 --skill devlyn-product-spec
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: devlyn:product-spec
Source: https://github.com/fysoul17/ian-on-v1/tree/main/ian-on/.claude/skills/devlyn%3Aproduct-spec
Command: npx skills add https://github.com/fysoul17/ian-on-v1 --skill devlyn-product-spec

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill converts vague product direction into a structured, build-ready Product Spec so downstream agents can reliably generate feature specs, plans, and implementation work without ambiguity.

Core Features & Use Cases

  • Create a complete Product Spec from a template when no existing spec is present.
  • Update an existing Product Spec incrementally by applying targeted changes while preserving other sections.
  • Separate product intent from implementation details by keeping domain and decisions while filtering out low-level tech syntax, environment variables, and API boilerplate.
  • Enforce quality and completeness with required fields, consistent entity/behavior coverage, permissions, limits, integrations, views, and validation guidance.
  • Scope work across phases (MVP vs later enhancements) to ensure the first release supports the core value loop end-to-end.

Quick Start

Ask the Skill to create or update a Product Spec by providing your product description or the specific changes you want applied to the existing spec.

Frequently Asked Questions about devlyn:product-spec

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

FAQPage Schema
How do I turn a vague product idea into a build-ready product spec?▼

To turn a vague product idea into a build-ready spec, provide your product description to generate a structured document at docs/product-spec.md. It enforces required fields, entity coverage, and MVP scoping while filtering out low-level implementation details.

Can I incrementally update an existing PRD without rewriting the entire document?▼

Yes, you can incrementally update an existing PRD by applying targeted changes while preserving other sections. This human-in-the-loop approach modifies specific product spec sections without rewriting the entire document.

What is the difference between product intent and implementation details in a feature spec?▼

Product intent in a feature spec captures domain rules and decisions, while implementation details include low-level tech syntax, environment variables, and API boilerplate. A proper product spec preserves intent and filters out implementation details.

How do I scope MVP features versus later enhancements in product planning?▼

Scoping MVP features versus later enhancements involves defining work across phases to ensure the first release supports the core value loop end-to-end. The product spec separates MVP requirements from future enhancements during feature planning.

Does generating a product spec require technical configuration or API setup?▼

Generating a product spec does not require technical configuration or API setup. It filters out environment variables and API boilerplate, focusing purely on product domain rules, permissions, limits, and validation guidance.

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