prd-master SKILL.md skillA
prd-master from majiayu000/spellbook is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add majiayu000/spellbook/prd-master@git:20260523.d39dd11Pins git:20260523.d39dd11 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- majiayu000/spellbook
- Path
skills/prd-master/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260523.d39dd11, committed May 23, 2026
- First version recorded
- Dec 18, 2025
- Size
- 13,567 bytes
- Repository stars
- 290
- License
- MIT
PRD writing and product definition expert. Use when writing PRDs, user stories, acceptance criteria, or prioritizing features. Covers RICE/MoSCoW frameworks, agile requirements, and specification best practices.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# PRD Master ## Core Principles - **Living Document** — PRDs evolve throughout product lifecycle - **Stakeholder Collaboration** — Early involvement prevents late rework - **Measurable Goals** — Replace vague with quantifiable targets - **Focused yet Flexible** — Lean structure enables adaptation - **Problem-First** — Define the problem before jumping to solutions - **User-Centered** — Ground decisions in user research and data --- ## Hard Rules (Must Follow) > These rules are mandatory. Violating them means the skill is not working correctly. ### No Vague Metrics **All metrics and requirements must be quantifiable. Vague descriptions are forbidden.** ``` ❌ FORBIDDEN: - "The app should be fast" - "Support many users" - "Good user experience" - "The system should be reliable" - "Easy to use interface" ✅ REQUIRED: - "Page load time < 2s on 4G, < 500ms on WiFi (P95)" - "Support 10,000 concurrent users with 99.9% uptime" - "NPS > 50, Task completion rate > 85%" - "99.9% availability, MTTR < 1 hour" - "User can complete checkout in < 3 clicks" ``` ### Problem Before Solution **Never propose a solution without clearly defining the problem first.** ``` ❌ FORBIDDEN: …
Read the whole file at its exact version.
How to install
mdr add majiayu000/spellbook/prd-master@sha256:259578f29349bd65The line at the top of this page pins the label git:20260523.d39dd11, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_3htry4qzaswmow5s)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Dec 18, 2025 and May 23, 2026, about one every 78 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260523.d39dd11 latest | 2026-05-23 | d39dd11 | 13,567 B | A | view · diff |
| git:20251218.65d8cd4 | 2025-12-18 | 65d8cd4 | 19,770 B | A | view · diff |
| git:20251218.0e33f85 | 2025-12-18 | 0e33f85 | 18,179 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (13567 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
majiayu000/spellbook · 290 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_3htry4qzaswmow5s GET https://markdownregistry.com/api/v1/resolve?ref=majiayu000/spellbook/prd-master GET https://markdownregistry.com/api/v1/blob/259578f29349bd65d9e7d174b2e03cc77dc950daa3d15ac0c43dd013e099366a
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.