prd-quality-guard

prd-quality-guard is a skill for Claude Code from josemerca/mercadona-user-story-toolkit. It costs 153 tokens per session (2,409 once invoked), scanned A, original, MIT.

A quality gate for product requirements documents, or PRDs, that checks whether the problem, proposed direction, evidence, scope, and measures are clear enough for research.

In plain words
What is it for?
Use it to assess three PRD quality areas, assign a score, and decide whether the document can move on to research.
Why use it?
It exposes missing facts, unclear outcomes, weak discovery, or uncontrolled scope before research begins. It diagnoses gaps instead of rewriting the document for you.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is python3 scripts/score_prd.py --d1=<D1> --d2=<D2> --d3=<D3>.

Part of the mercadona-user-story-toolkit plugin — 8 skills, 11 commands shipped together

Good fit Use it to assess three PRD quality areas, assign a score, and decide whether the document can move on to research.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/josemerca/mercadona-user-story-toolkit
agentmods
npx agentmods add skills/josemerca/mercadona-user-story-toolkit/prd-quality-guard

Made for: Claude Code.

Or install mercadona-user-story-toolkit, the plugin that ships this one along with the rest of its 8 skills, 11 commands.

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 prd-quality-guard

README.md
[![agentmods](https://agentmods.dev/badge/skills/josemerca/mercadona-user-story-toolkit/prd-quality-guard/github.svg)](https://agentmods.dev/skills/josemerca/mercadona-user-story-toolkit/prd-quality-guard)
Your own site
<a href="https://agentmods.dev/skills/josemerca/mercadona-user-story-toolkit/prd-quality-guard"><img src="https://agentmods.dev/badge/skills/josemerca/mercadona-user-story-toolkit/prd-quality-guard/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 prd-quality-guard

Your own site · 80×15
<a href="https://agentmods.dev/skills/josemerca/mercadona-user-story-toolkit/prd-quality-guard"><img src="https://agentmods.dev/badge/skills/josemerca/mercadona-user-story-toolkit/prd-quality-guard.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 153 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,409 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 $0.00153 $0.02409
Opus 5 $0.00077 $0.01205
Sonnet 5 $0.00031 $0.00482
Haiku 4.5 $0.00015 $0.00241

Measured 12d ago against content hash 5f9a90827689, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

prd-quality-guard 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 12d 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.

skills/prd-quality-guard/SKILL.md · 240 lines

How it starts

The opening of the file, as written. The whole thing — 240 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PRD Quality Guard v1.0 — Quality Gate para PRDs

Asiste al usuario en evaluar la calidad de un PRD y determinar si tiene la profundidad suficiente para pasar a research.

Modo copiloto: Esta skill diagnostica y señala gaps del PRD, pero NO completa ni reescribe secciones por el usuario. Propone preguntas para completar lo que falta. Ver shared-config.md §Filosofía del Plugin.

"Un buen PRD define con precisión el problema (EAC) y la dirección (EFC). El research valida si lo que creemos saber es cierto."

Principio Fundamental

┌──────────────────────────────────────────────────────────────────┐
│                                                                   │
│   EAC (Estado Actual Conocido)       EFC (Estado Futuro Conocido)│
│   ────────────────────────           ────────────────────────────│
│                                                                   │
│   ✅ Problema con evidencia          ✅ Hipótesis de solución     │
│   ✅ Farolas (datos cuantitativos)   ✅ Métricas medibles        │
│   ✅ Penumbras (observaciones)       ✅ Impacto dimensionado     │
│   ✅ Discovery realizado             ✅ Funcionalidades claras   │
│   ✅ FAQs / Exclusiones              ✅ Flujos de usuario        │
│                                                                   │
│   ❌ NO vagas ("necesitamos          ❌ NO métricas sin          │
│       mejorar...")                        baseline/target          │
│   ❌ NO soluciones en el problema    ❌ NO features sin usuario   │
│   ❌ NO adjetivos sin datos          ❌ NO scope sin exclusiones  │
│                                                                   │
└──────────────────────────────────────────────────────────────────┘

Ver SKILL-reference.md §S1 para estructura completa de secciones del PRD (14 secciones, tipos y contenido)


Flujo de Evaluación

PRD (fichero, URL o contenido pegado)
    │
    ▼
┌──────────────────────────────────────┐
│  1. CARGAR PRD                        │
│     - Leer fichero local (Read tool)  │
│     - Fetch URL pública (WebFetch)    │
│     - O contenido pegado por usuario  │
└──────────────────────────────────────┘
    │
    ▼
┌──────────────────────────────────────┐
│  2. INVENTARIO DE SECCIONES           │
│     - Escanear todas las secciones    │
│     - Marcar estado por sección       │
│     - Detectar secciones faltantes    │
└──────────────────────────────────────┘
    │
    ▼
┌──────────────────────────────────────┐
│  🗣️ CHECKPOINT 1: POST-INVENTARIO    │
│     Comunicar estado al usuario       │
│     Ofrecer opciones de continuación  │
└──────────────────────────────────────┘
    │
    ▼
┌──────────────────────────────────────┐
│  3. SCORING 3 DIMENSIONES             │
│     D1: Completitud EAC (0-10)        │
│     D2: Claridad EFC + Métricas       │
│     D3: Rigor Discovery + Scope       │
│     Global = Promedio(D1, D2, D3)     │
└──────────────────────────────────────┘
    │
    ▼
┌──────────────────────────────────────┐
│  4. DETECCIÓN ANTIPATRONES            │
│     AP-PRD-1 a AP-PRD-5              │
└──────────────────────────────────────┘
    │
    ▼
┌──────────────────────────────────────┐
│  5. GATE DECISION                     │
│     ≥7 → PASS (proceder a research)  │
│     5-6 → CONDICIONAL                │
│     <5 → FAIL                         │
│     D3 < 5 → FAIL automático         │
└──────────────────────────────────────┘
    │
    ▼
┌──────────────────────────────────────┐
│  6. REPORTE DE CALIDAD                │
│     Leer report-template-prd.md       │
│     Generar reporte completo          │
│     Incluir recomendaciones           │
└──────────────────────────────────────┘
    │
    ▼
GATE DECISION → PASS / CONDICIONAL / FAIL

Read the full file on GitHub · 240 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 12d ago First seen · 240 lines · 153 tokens per session scan A 5f9a90827689

Subscribe to this mod's changes

prd-quality-guard is a skill published in the GitHub repository josemerca/mercadona-user-story-toolkit (25 stars, last pushed 4mo ago), licensed MIT. It adds 153 tokens to every session and 2,409 once invoked, about $0.0008 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.

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