---
title: "reaharness is live An open-source harness to reverse engineer anything. Built on"
url: "https://reamcp.dev/en/cases/reaharness-is-live-an-open-source-harness-to-reverse-enginee-f15aba"
source: "https://x.com/i/status/2109660368616460317"
source_type: "x"
author: "Arjun Shah"
author_handle: "arjunkshah21"
stars: 0
category: "Tools & integrations"
categories: ["tools-integrations"]
tags: ["agent-harness", "mcp", "multi-provider", "rea", "reverse-engineering"]
added: "2026-10-13T04:17:58.227Z"
updated: "2026-10-12T15:00:02.000Z"
locale: "en"
content_locale: "en"
---

# reaharness is live An open-source harness to reverse engineer anything. Built on

reaharness is live

An open-source harness to reverse engineer anything.

Built on top of the popular Reverse Engineer Anything (REA) repo, here are some of the highlights:

- Multi-provider agent loop (OpenAI, Anthropic, OpenRouter, Groq, Ollama, and OpenAI-compatible gateways)

- Idempotent setup for Cursor, Claude, OpenCode, Goose, Codex, VS Code, Windsurf, and more

- Every tool result shaped as { ok, data, evidence, unknowns, limits }

Site: https://t.co/Xt7a4zoGdN

Repo: https://t.co/nXBJa2REWa

## Original README

reaharness is live

An open-source harness to reverse engineer anything.

Built on top of the popular Reverse Engineer Anything (REA) repo, here are some of the highlights:

- Multi-provider agent loop (OpenAI, Anthropic, OpenRouter, Groq, Ollama, and OpenAI-compatible gateways)

- Idempotent setup for Cursor, Claude, OpenCode, Goose, Codex, VS Code, Windsurf, and more

- Every tool result shaped as { ok, data, evidence, unknowns, limits }

Site: https://reaharness.vercel.app

Repo: https://github.com/arjunkshah12345-hash/reaharness