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PRD Master · majiayu000 | DecimalAI

productivityby majiayu000

PRD Master

majiayu000/prd-master

Source majiayu000/spellbook ↗License MIT

PRD writing and product definition expert.

SkillScore91Maintained

Automatic

Product Management pack

Last verified 8/24/2026

What it changes

Passed 20 of 22 test cases with the skill, and 17 of 22 without it.

Without skill77%

With skill91%

Checks it passed that the model alone missed

Categorizes custom theme customization under Could Have or Won't Have.
Includes quantifiable success metrics with explicit targets in the PRD.
Includes acceptance criteria formatted using the Given-When-Then BDD structure.

and 2 more in the full report

4 fixed16 passed either way1 still failing1 broke

Pass-rate lift: +14 pp
Tokens: +144%
Agent turns: 0%
Response time: -4%

Model gemini-3.6-flashMeasured 8/24/2026v120 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/majiayu000-prd-master/SKILL.md https://app.decimal.ai/s/majiayu000-prd-master/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add majiayu000-prd-master, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/majiayu000-prd-master/ and pins it in .decimal/skills.lock

decimalai skills add majiayu000-prd-master

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/majiayu000-prd-master/SKILL.md https://app.decimal.ai/s/majiayu000-prd-master/SKILL.md

Raw file: /s/majiayu000-prd-master/SKILL.md ↗ · machine-readable summary at /s/majiayu000-prd-master.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 4

Prompt

We are defining the scope for an MVP release of a subscription box billing service. The team wants to include credit card processing, social sharing, gift cards, recurring billing engine, and custom theme customization. Apply the MoSCoW prioritization framework to categorize these five items into appropriate launch buckets.

What was checked, without and with the skill
Checked	Without skill	With skill
Categorizes credit card processing and recurring billing engine under Must Have.	Passed	Passed
Categorizes custom theme customization under Could Have or Won't Have.	Missed	Passed

case-05 · gemini-3.6-flash · 8/24/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md474 lines2 files

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.

Track record

Benchmark

20 / 22

test cases passed, vs 17 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

majiayu000 / spellbook

skills/prd-master/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1Bundled 1 file

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

PRD Master

Core Principles

Hard Rules (Must Follow)

No Vague Metrics

Problem Before Solution

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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