PETBRAINS
An indie publication for technical builders shipping with AI agents. Tools, methodology, tutorials — no demos, no fluff.
- 01
AI demos stop at the prompt. They never show the second-day work — the verifying, the rework, the regression a junior would have caught.
- 02
Generic AI workflows produce generic UI. Cyan-on-dark, gradient text, three-column feature card rows — the visual default since 2023, regardless of brand.
- 03
Specs rot the moment code is written. Most teams treat the document as input, then never reconcile what shipped against what was specified.
- 04
Open-source AI tooling is scattered across READMEs. There's no canonical place to read the methodology behind the tools, no editorial line that connects them.
// about
We'd rather go deep
than go viral
Pet Brains publishes Document-Driven Development — a method for shipping production software with AI agents — and the open-source tools that run it in Claude Code. The model reasons well and codes carelessly, so the tools make it work like a senior: spec first, generate against the spec, verify before anything ships.
It's for builders already past the demo — whose code goes through review, not just a screenshot. No hype, no trend-chasing. We publish what we run ourselves.
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Ship only what we use ourselves.
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Avoid hype; back fundamentals.
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Keep learning, forever.
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Respect feedback; think for yourself.
// build
- // 01
MVP-builder
MVP-builder is the Claude Code workflow we use for greenfield projects. Document-driven, ships a structured chapter list before any code lands — TDD cycles and a self-review loop keep the agent from committing broken work.
- // 02
Dev-team-agents
Dev-team-agents runs one Claude Code session as a coordinated dev team — an orchestrator dispatches specialists, hooks enforce the handoffs, and review is done by a context that didn't write the code.
// design
- // 03
Design-builder
Design-builder is the Claude Code plugin that produces production-grade UI without the AI slop. Anti-pattern filters, motion principles, HIG references — four commands cover setup, create, improve, review.
- // 04
Designlib-MCP
Designlib-MCP is a Model Context Protocol server giving AI coding agents access to a curated catalog of palettes, fonts, inspiration pages, and patterns. Works with Claude Code, Cursor, Copilot.
Get the methodology behind the tools.
// subscribed
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