Is the Brain-Build skill free?

Yes. The skill itself is free from stuinfla/ruvnet-brain. SkillProof publishes the install command and an independent test verdict at no cost.

How do I install Brain-Build?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Brain-Build with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Brain-Build

Autonomous SPARC build contract: phase gates, self-grade >=95 loop, checkpoints

by stuinfla · stuinfla/ruvnet-brain

Tested · Didn't pass

Read why it failed Download source ↗

Test report

Verdict: Tested · Didn't pass
Tested: Jul 17, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · d9561c1

Installed as a standalone skill it is inert: its own instructed commands 'node scripts/loop-checkpoint.mjs' and 'scripts/route-cheap.mjs' throw MODULE_NOT_FOUND because those scripts live in the repo root, not the copied skill dir, and it also calls a search_ruvnet MCP tool and a separate brain-score skill that a bare copy never brings. What survives is prompt discipline (SPARC phases, >=95 self-grade gate), which doesn't measurably beat an unstructured baseline on a small task; it only works properly via the full ruvnet-brain plugin (npx github:stuinfla/ruvnet-brain).

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 3/5
Triggers reliably 4/5
Output vs. baseline 4/10
Docs & honesty 3/5

What Brain-Build does

A prompt-contract skill that turns '/brain-build <goal>' into a hands-off, phase-gated SPARC build with a self-graded /100 quality loop (fix-and-regrade below 95), cost-tier routing, and crash-resumable checkpoints. It is really the front end of the larger ruvnet-brain plugin. Triggers on '/brain-build', 'build this autonomously', 'loop until it's done', or 'don't ask me, just build it'.

How to install Brain-Build

git clone https://github.com/stuinfla/ruvnet-brain
mkdir -p ~/.claude/skills
cd ruvnet-brain && cp -r plugin/skills/brain-build ~/.claude/skills/brain-build

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Brain-Build

/brain-build Autonomous SPARC build contract: phase gates, self-grade >=95 loop, checkpoints

It also activates on plain-language prompts like these:

Build this feature autonomously, don't ask me questions, just build it
Loop on this module until it self-grades above 95, then stop
Run a hands-off, phase-gated build of this whole app

Frequently asked questions

Is the Brain-Build skill free?: Yes. The skill itself is free from stuinfla/ruvnet-brain. SkillProof publishes the install command and an independent test verdict at no cost.
Does Brain-Build work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 17, 2026. Verdict: Tested · Didn't pass. Installed as a standalone skill it is inert: its own instructed commands 'node scripts/loop-checkpoint.mjs' and 'scripts/route-cheap.mjs' throw MODULE_NOT_FOUND because those scripts live in the repo root, not the copied skill dir, and it also calls a search_ruvnet MCP tool and a separate brain-score skill that a bare copy never brings. What survives is prompt discipline (SPARC phases, >=95 self-grade gate), which doesn't measurably beat an unstructured baseline on a small task; it only works properly via the full ruvnet-brain plugin (npx github:stuinfla/ruvnet-brain).
How do I install Brain-Build?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Brain-Build with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.