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.
git clone --depth 1 https://github.com/josemerca/mercadona-user-story-toolkitnpx agentmods add skills/josemerca/mercadona-user-story-toolkit/user-story-builderWrote 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.
[](https://agentmods.dev/skills/josemerca/mercadona-user-story-toolkit/user-story-builder)<a href="https://agentmods.dev/skills/josemerca/mercadona-user-story-toolkit/user-story-builder"><img src="https://agentmods.dev/badge/skills/josemerca/mercadona-user-story-toolkit/user-story-builder/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.
<a href="https://agentmods.dev/skills/josemerca/mercadona-user-story-toolkit/user-story-builder"><img src="https://agentmods.dev/badge/skills/josemerca/mercadona-user-story-toolkit/user-story-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00160 | $0.02689 |
| Opus 5 | $0.00080 | $0.01345 |
| Sonnet 5 | $0.00032 | $0.00538 |
| Haiku 4.5 | $0.00016 | $0.00269 |
Grade A, and why
user-story-builder 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 13d 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.
How it starts
The opening of the file, as written. The whole thing — 279 lines — stays where its author put it; the contents beside it link to each section on GitHub.
User Story Builder
Asistente conversacional que guía la creación de user stories de alta calidad usando metodología JTBD (Jobs To Be Done).
Modo copiloto: Esta skill es 100% conversacional. NUNCA genera una story completa sin haber recorrido las 6 fases con el usuario. Si el usuario quiere ir rápido, hacer las preguntas mínimas de cada fase pero NUNCA saltarse fases ni inventar respuestas. Ver shared-config.md §Filosofía del Plugin.
Filosofía
Las personas no compran productos, "contratan" soluciones para realizar trabajos específicos en sus vidas. Una buena user story captura:
- QUIÉN - Usuario específico (no genérico)
- CUÁNDO - Situación/contexto que dispara la necesidad
- QUÉ - El trabajo que necesita realizar (job)
- PARA QUÉ - Resultado deseado con sus tres dimensiones:
- Funcional (tarea práctica)
- Emocional (cómo quiere sentirse)
- Social (cómo quiere ser percibido)
Flujo Conversacional
El proceso sigue 6 fases. Avanzar solo cuando la fase actual esté completa.
┌─────────────────────────────────────────────────────────────┐
│ FASE 1: CONTEXTO INICIAL │
│ "¿Qué problema quieres resolver?" │
└─────────────────────────────────────────────────────────────┘
↓
┌─────────────────────────────────────────────────────────────┐
│ FASE 2: DESCUBRIR EL JOB │
│ Identificar el trabajo real (no la solución) │
└─────────────────────────────────────────────────────────────┘
↓
┌─────────────────────────────────────────────────────────────┐
│ FASE 3: ESPECIFICAR EL USUARIO │
│ Wendel Checklist: 4 preguntas clave │
└─────────────────────────────────────────────────────────────┘
↓
┌─────────────────────────────────────────────────────────────┐
│ FASE 4: DIMENSIONES DEL JOB │
│ Motivaciones funcional, emocional y social │
└─────────────────────────────────────────────────────────────┘
↓
┌─────────────────────────────────────────────────────────────┐
│ FASE 5: CAMBIO DE COMPORTAMIENTO │
│ START / STOP / DIFFERENT con rangos │
└─────────────────────────────────────────────────────────────┘
↓
┌─────────────────────────────────────────────────────────────┐
│ FASE 6: GENERAR USER STORY │
│ Formato completo JTBD + validación │
└─────────────────────────────────────────────────────────────┘
What ships with it
5 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.
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.
- 13d ago First seen · 279 lines · 160 tokens per session scan A f7a046908d39
user-story-builder is a skill published in the GitHub repository josemerca/mercadona-user-story-toolkit (25 stars, last pushed 4mo ago), licensed MIT. It adds 160 tokens to every session and 2,689 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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