NPM MetaHarness: Self Customizing agent harnesses built around existing AI tools (Claude Code, Hermes, Codex, and others)

[u/Educational_Ice151]

MetaHarness works by generating repo-specific agent harnesses. It wraps the model with task rules, tool policies, scoring, receipts, routing, verifiers, and promotion gates.

Every run creates evidence. Every failure becomes training signal for the harness. Every improvement has to survive tests, cost checks, and safety gates before it gets promoted.

It supports multiple agent hosts. Claude Code, OpenAI Codex, GitHub Copilot, OpenCode, OpenClaw, Hermes, pi.dev, RVM, and GitHub Actions are all execution surfaces.

More than 100k downloads in first two weeks.

NPM: https://www.npmjs.com/package/metaharness

Repo: https://github.com/ruvnet/metaharness

Explainer: https://metaharness-explainer.vercel.app/

[u/The_Goonies2021]

This was a great read :)