builder-product
June 16, 2026 · View on GitHub
Skills and agents that enforce product quality before engineering time is committed: problems defined before scopes, metrics instrumented before builds, research synthesised into decisions before planning, and AI features validated for hallucination UX, trust calibration, and reversibility before approval.
Works standalone or alongside A Team, builder-ai, builder-design, and builder-growth.
Skills
| Skill | What It Enforces |
|---|---|
mvp-scope-validator | Core hypothesis extracted and scope reduced to minimum before any PRD is written |
prd-quality-gate | User problem + success metric + scope boundary + anti-goals before any estimate |
feature-scoping | Written scope before estimate; estimate before commit; no open-ended "we'll see" specs |
metric-definition | North star, guardrail, and diagnostic metrics with baselines before build begins |
user-research-synthesis | Insight → decision chain documented; no "users said X" without "therefore we will Y" |
ab-test-design | Hypothesis, metric, sample size, duration, stopping rule, decision rule before any test runs |
ai-feature-validation | Hallucination UX, trust calibration, capability scope, and reversibility in every AI PRD |
Agents
| Agent | Role |
|---|---|
product-critic (Sonnet) | Reviews PRDs and feature specs against all skill gates; PASS / CONDITIONAL / BLOCK |
metric-designer (Sonnet) | Designs measurement frameworks with verified baselines before features are built |
research-synthesiser (Opus) | Synthesises user research into an insight → decision chain |
Install
# bash (macOS / Linux / WSL)
bash <(curl -fsSL https://raw.githubusercontent.com/RBraga01/builder-product/master/install.sh)
# PowerShell (Windows)
irm https://raw.githubusercontent.com/RBraga01/builder-product/master/install.ps1 | iex
Or clone directly:
git clone https://github.com/RBraga01/builder-product
cp -rn builder-product/skills your-project/
cp -rn builder-product/.claude your-project/
The builder-* Ecosystem
| Pack | Domain | Skills | Agents |
|---|---|---|---|
| A Team | Engineering baseline | 19 | 26 |
| builder-ai | LLM engineering | 8 | 5 |
| builder-design | AI UI design | 8 | 5 |
| builder-product | Product quality | 7 | 3 |
| builder-growth | Growth & messaging | 6 | 3 |
All packs share the same enforcement model: Completion Statement Formats that require real values, not summaries.
License
MIT — Ricardo Romão Marques Braga