Home / majiayu000 / spellbook · GitHub

product-discovery SKILL.md skillA

product-discovery from majiayu000/spellbook is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add majiayu000/spellbook/product-discovery@git:20260523.d39dd11

Pins 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/product-discovery/SKILL.md
Versions recorded: 3
Latest version: git:20260523.d39dd11, committed May 23, 2026
First version recorded: Dec 18, 2025
Size: 13,355 bytes
Repository stars: 290
License: MIT

Product discovery and market research expert. Use when validating product ideas, conducting market research, user interviews, competitive analysis, or opportunity assessment. Covers JTBD, Kano model, and Value Proposition Canvas.

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

# Product Discovery

## Core Principles

- **Continuous Discovery** — Weekly user conversations, not episodic research
- **Outcome-Driven** — Start with outcomes to achieve, not solutions to build
- **Assumption Testing** — Validate risky assumptions before committing resources
- **Co-Creation** — Build with customers, not just for them
- **Data-Driven** — Use evidence over intuition and stakeholder opinions
- **Problem-First** — Deeply understand the problem space before ideating solutions

---

## Hard Rules (Must Follow)

> These rules are mandatory. Violating them means the skill is not working correctly.

### No Solution-First Thinking

**Never start with a solution. Always define the problem and outcome first.**

```markdown
❌ FORBIDDEN:
"We should build a search bar for the product page"
"Let's add AI recommendations"
"Users need a mobile app"

✅ REQUIRED:
"Problem: Users can't find products (40% exit rate on catalog)
Outcome: Reduce exit rate to 20%
Possible solutions:
1. Search bar with filters
2. AI-powered recommendations
3. Better category navigation
4. Visual product browsing"
```

### Evidence-Based Decisions
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add majiayu000/spellbook/product-discovery@sha256:3321ea4ae402e673

The 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_tag7b54gkuyll4bj.svg)](https://markdownregistry.com/a/art_tag7b54gkuyll4bj)

5 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	13,355 B	A	view · diff
git:20251218.65d8cd4	2025-12-18	65d8cd4	16,197 B	A	view · diff
git:20251218.0e33f85	2025-12-18	0e33f85	13,726 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (13355 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

GitHub

majiayu000/spellbook · 290 stars · license MIT · pushed 2026-11-04 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_tag7b54gkuyll4bj
GET https://markdownregistry.com/api/v1/resolve?ref=majiayu000/spellbook/product-discovery
GET https://markdownregistry.com/api/v1/blob/3321ea4ae402e673c03c9f62c9b7c503a944262cac76a342ded7df24e8a3e1e0

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.

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