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@stdin stdin released this 19 Jun 08:59
· 28 commits to main since this release
v0.1.0
25e82a8

First release of Buy vs Build — an always-on buy-before-build ruleset for AI coding agents.

Before writing code, the agent classifies the work (core vs context, commodity vs novel), walks a reuse ladder, and builds in-house only for core, novel work:

do-nothing → built-in → native-platform → installed-dependency → open-source → commercial → in-house

Highlights

  • One rule, every host. Ships the same canonical rule to Codex, Claude Code, Gemini, Cursor, GitHub Copilot, Windsurf, Cline, Kiro, OpenCode, and OpenClaw — kept byte-in-sync by a drift check.
  • Strategic routing. Core-vs-context + commodity-vs-novel 2×2, reversibility (one-way vs two-way doors), and total-cost-of-ownership framing on top of the reuse ladder.
  • Skills + lifecycle hooks for applying, reviewing, auditing, and writing decision memos.
  • Behavior benchmarks for both Codex and Claude (npm run benchmark:behavior[:claude]). Latest Claude run: baseline 18/30 → enabled 29/30 (+11), correct-rung hits 4/6 → 6/6.

Install

  • Codex: codex plugin marketplace add stdin/buy-vs-build
  • Gemini CLI: gemini extensions install https://github.com/stdin/buy-vs-build
  • Claude Code / instruction-only hosts: use the plugin, or copy the matching rule file (CLAUDE.md, AGENTS.md, .cursor/rules/..., etc.).
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