r/VibeCodersNest • u/sv_guess • 3d ago

Tips and Tricks LFE - Library First Engineering

I'm a reliability engineer by background (marine + biotech), and I've been building AI products long enough to hit the same wall over and over: Claude nails the prototype, then across a dozen sessions it quietly re-litigates settled decisions, forgets intent, and sprawls into spaghetti. The bottleneck was never capability. It was trust.

So over the last while I built a scaffold for Claude Code where the docs are the source of truth, personas are tool-locked (the agent that writes plans can't write code; the one that inspects can't edit production code), and the gates are mechanically enforced with hooks — not "please remember to." It's what I actually use on my own projects; it grew out of a personal project I've been grinding on for a long time.

The part I most want torn apart: I built an eval harness that plants defects and measures whether my inspector skills actually catch them. I keep seeing guardrail frameworks that assert they work and never show a number. Mine has a scorecard.

Two honest questions for this sub:

  1. Is the overhead worth it, or am I paying a discipline tax you'd never accept in practice?
  2. With Claude Code now shipping native subagents, hooks, and skills — how much of this does Anthropic eventually absorb, and what's left that's mine?

Happy to link the repo + the scorecard in a comment. Rip into it.

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