**English** · [简体中文](README_zh.md) · [繁體中文](README_zh-TW.md) · [日本語](README_ja.md) · [한국어](README_ko.md) · [Türkçe](README_tr.md) · [Русский](README_ru.md) · [Tiếng Việt](README_vi.md) · [ไทย](README_th.md) · [Deutsch](README_de.md) · [Español](README_es.md) · [Français](README_fr.md) · [Українська](README_uk.md) · [Polski](README_pl.md) · [Português (Brasil)](README_pt-BR.md) · [العربية](README_ar.md) · [فارسی](README_fa.md) · [Bahasa Indonesia](README_id.md) · [Italiano](README_it.md) # REA: Reverse Engineer Anything ### One MCP for reverse engineering across binaries, applications, and runtime behavior. **See a feature you like. Understand how it works, down to the binary level.** [![npm version](https://img.shields.io/npm/v/rea-agents?style=flat-square&color=cb3837)](https://www.npmjs.com/package/rea-agents) [![CI](https://img.shields.io/github/actions/workflow/status/morluto/rea/ci.yml?branch=main&style=flat-square&label=CI)](https://github.com/morluto/rea/actions/workflows/ci.yml) [![MCP tool catalog](https://img.shields.io/badge/MCP-tool_catalog-5c4ee5?style=flat-square)](docs/mcp-contracts.md#generated-catalog) [![Node.js requirements](https://img.shields.io/badge/Node.js-requirements-339933?style=flat-square&logo=nodedotjs&logoColor=white)](#what-you-can-analyze) [![skills.sh](https://skills.sh/b/morluto/rea?style=flat-square)](https://skills.sh/morluto/rea/reverse-engineer-anything) [![MIT license](https://img.shields.io/badge/license-MIT-f4c430?style=flat-square)](LICENSE) [![Discord](https://img.shields.io/discord/1556595354999332884?logo=discord&logoColor=white&label=Discord&color=5865F2)](https://discord.gg/GkcryMnJDM) morluto%2Frea | Trendshift **[Website](https://rea.tools/) · [Guides](https://rea.tools/guides/) · [Showcases](https://rea.tools/showcase/)** [Quick start](#quick-start) · [How REA works](#how-rea-works) · [What you can analyze](#what-you-can-analyze) · [Showcases](#showcases) · [FAQ](#faq) · [Documentation](#documentation) npx rea-agents setup
REA launching its analysis bridge inside Hopper while inspecting a native binary

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--- See a feature in an app that you want in your own product? Ask your agent to investigate it with REA. It can inspect the app without its source code, explain how the feature works, show the evidence, and build a version for your project. REA connects your agent to tools for inspecting native binaries, JavaScript and Electron apps, .NET assemblies, and websites. You can also use the same tools from your terminal. Analysis runs locally, and results include the evidence and limitations behind each conclusion. Setup registers REA with your agent and installs matching workflow instructions. Native analysis can use an existing Hopper, Ghidra, or IDA installation; setup can optionally install Hopper with approval. Static JavaScript analysis needs no native analysis engine. > **[Visit the REA website](https://rea.tools/)** for setup instructions, illustrated guides, and real case studies. ## Quick start ### Set up your agent With Node.js and npm installed, run: ```bash npx rea-agents setup ``` Choose your agents, review the proposed changes, and approve them. Setup adds REA's MCP server and matching workflow instructions, with backups of existing configuration. Restart your agent afterward. Setup supports Claude Code, Codex, Cursor, Gemini CLI, Grok Build and [other agents](docs/installation.md#supported-agents). See [installation and setup](docs/installation.md) for provider configuration and manual MCP registration. ### Ask your agent ```text Understand how search works in the Notes app, show me the evidence, and build a similar feature for my project. ``` Replace Notes with your target app and the feature you want to understand. ### Use the terminal Inspect an extracted JavaScript/Electron app directory or ASAR: ```bash npx -y rea-agents@latest analyze-javascript-application /absolute/path/to/app --json ``` The result includes modules, imports, Electron boundaries and their evidence. Replace the path with your target, such as `"D:/apps/example"` on Windows. To install the `rea` command for regular use: ```bash npm install --global rea-agents rea --help ``` For native analysis, configure a provider first. See the [CLI and Evidence guide](docs/cli.md) for native commands, provider selection, snapshots and scripting. ### Update REA REA changes quickly, and new releases include frequent bug fixes. Keep your installation up to date. For a CLI installed with `npm install --global` or `bun add --global`: ```bash rea update ``` Bun global updates require Bun 1.2.17 or later. With an older Bun release, upgrade Bun manually before running `rea update`. To refresh your agent registrations and skill, run the setup command printed by the update. If you use `npx`, update your agent setup with: ```bash npx rea-agents@latest setup ``` Review the setup changes and restart your agent. For one-off CLI commands, use `npx rea-agents@latest` followed by the command. With Bun, use `bunx rea-agents@latest` in place of `npx rea-agents@latest`. ## How REA works Your agent calls REA through MCP to inspect the target and trace relevant code. REA returns findings with their evidence. The agent uses them to ask follow-up questions, explain the behavior, or write and test an implementation. CLI commands use the same workflows. ![REA investigation flow: your agent asks about a local target, REA inspects and traces it using analysis tools, and the agent uses the returned code, references and unknowns to explain, implement and test.](website/public/assets/figures/rea-investigation-flow.svg) [Open the full-size figure](website/public/assets/figures/rea-investigation-flow.svg). ## What you can analyze REA requires Node.js 22.x (>=22.19), 24.x (>=24.11), or 26+, plus npm. Additional tools and host support depend on the target: | Target | What REA returns | Requirements and guide | | ---------------------- | ------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------- | | Native binaries | Pseudocode, assembly, strings, symbols, calls and references | Hopper, Ghidra or IDA; [native analysis](https://rea.tools/guides/native/) | | Offline ELF layout | Sections, segments, original symbols/relocations and static mitigation candidates | Caller-supplied pwntools on Linux x64; [binary diagnostics](docs/binary-diagnostics.md) | | EVM bytecode | Dispatch selectors, byte offsets, inferred arguments and mutability | Local raw/hex carrier on Linux x64; [offline EVM guide](docs/evm-bytecode.md) | | Recorded Linux crashes | Raw notes, every recorded thread's registers/signals and optional mapping candidates | Caller-supplied pwntools on Linux x64; optional GDB/pwndbg; [recorded crashes](docs/recorded-crashes.md) | | JavaScript / Electron | Modules, imports, source maps, routes, IPC and native add-on relationships | Node.js and npm; [application analysis](https://rea.tools/guides/javascript/) | | Websites | Page structure, scripts, network observations and requested screenshots | A Chrome-family browser; [browser analysis](https://rea.tools/guides/browser/) | | Saved network captures | Requests, responses, exposed payloads and source locations | HAR; mitmdump on Linux for native mitmproxy captures; [capture guide](docs/web-network-captures.md) | | .NET assemblies | Metadata, CIL instructions, declared native dependencies and build comparisons | None (static only); [managed-code guide](docs/managed-code-analysis.md) | | Android APKs | Manifest declarations, classes, decompiled methods and references | Headless JADX and a full JDK on Linux/macOS/Windows x64; [Android guide](docs/android-analysis.md) | | Android devices | Devices, packages, processes, logs, dumps, screen captures, and APK/file transfers | Caller-supplied adb (emulator or hardware); [ADB guide](docs/adb-device-analysis.md) | | JEB projects | Engine-backed project units, artifact digests and type/method pseudo-code | A caller-started JEB client serving MCP, selected with REA_JEB_MCP_URL; [JEB guide](docs/jeb-analysis.md) | | Android resources | Decoded manifest, string tables, locales and version facts | Caller-supplied Apktool launcher; [resource guide](docs/apktool-resource-analysis.md) | | Firmware | Regions, extraction results and native-analysis handoffs | Binwalk / Unblob on Linux; [firmware guide](docs/firmware-analysis.md) | | Packages and resources | File inventories, digests, plists, Apple bundle anatomy and extracted resources | [Artifact and JavaScript guide](docs/javascript-artifact-reconstruction.md), [Apple applications](docs/apple-application-analysis.md) | | Process behavior | Terminal output, interactions, exit and filesystem observations, and run comparisons | Linux/macOS with a native PTY; [process capture](docs/process-capture.md) | Static JavaScript and .NET inspection read the supplied files without running the application. Runtime capture runs or interacts with the selected target using your user permissions; each runtime guide describes its effects. Native formats and host support vary by provider. See [Hopper and Ghidra setup](docs/installation.md#hopper), the [IDA guide](docs/ida-provider.md), and [experimental Windows Ghidra support](docs/windows-ghidra-p0.md). Ghidra also supports [16-bit DOS analysis](docs/ghidra-dos.md). For large binaries, raise its startup deadline with `REA_GHIDRA_STARTUP_TIMEOUT_MS`. For provider selection, see the [CLI guide](docs/cli.md#choose-a-provider). Check [release availability](docs/installation.md#released-package-and-main) for features added since the latest npm release. ## Showcases [![Illustrations of the DX-Ball sound-pan, Notion clipboard-bridge, and TH04 bullet-ring showcases](docs/assets/rea-showcases.png)](https://rea.tools/showcase/) ### DX-Ball: reconstruct a sound-pan calculation Follow a sound call into its position-to-pan helper, inspect the instructions, and turn incomplete pseudocode into C. The reconstruction passes 3,205 original-x86 cases and reproduces all 63 compiled function bytes. [Read the case study](https://rea.tools/showcase/dx-ball/) · [Reconstruction repository](https://github.com/N0zoM1z0/dx-ball) ### Notion: trace the Electron clipboard bridge Find the renderer's clipboard API, follow it through preload and IPC into the main process, and inspect the rich clipboard format. [Read the case study](https://rea.tools/showcase/notion/) ### TH04: recover a DOS bullet-ring calculation Inspect the original PC-98 game's 16-bit instructions, recover the fixed and aimed angle calculations, and compare the reconstructed C++ with the historical compiler output. [Read the case study](https://rea.tools/showcase/th04/) · [Reconstruction repository](https://github.com/N0zoM1z0/th04) If you've used REA on something interesting, we'd love to see it. Share your case in an [issue](https://github.com/morluto/rea/issues) or a [pull request](https://github.com/morluto/rea/pulls), including the target, your question, how REA helped, and what you found. ## FAQ
Which agents can use REA? Any agent that supports local MCP servers. Setup configures the [supported agents](docs/installation.md#supported-agents); other clients can use [manual MCP registration](docs/installation.md#mcp-registry).
Do I need Hopper, Ghidra or IDA? Deep native analysis uses one of them. Static JavaScript and .NET inspection work without a native analysis engine. Setup can install Hopper after approval; Ghidra and IDA use your existing installations. See [provider setup](docs/installation.md#hopper).
Do I need to start Hopper first? REA starts Hopper when an operation needs it. On macOS, a first-run dialog may ask you to choose demo mode or activate your license. See [Hopper startup and troubleshooting](docs/installation.md#launcher-paths-and-troubleshooting).
What does installing the skill from skills.sh do? The skill supplies investigation instructions for your agent. Use `npx rea-agents setup` to register REA's MCP server and install the matching instructions, then restart your agent. See [skill-only installation](docs/installation.md#skill-only-installation).
What code does REA return? Native analysis returns pseudocode and assembly. JavaScript/Electron analysis recovers modules and their relationships. Your agent uses these findings to write and test an implementation; the [showcases](#showcases) give worked examples.
Does REA upload my app? REA analyzes targets locally. Your agent receives the tool results, and its model provider has its own data policy.
What should I do if I hit a bug? Update first; a recent release may already fix it. For a CLI installed with `npm install --global` or `bun add --global`: ```bash rea update ``` For agent setup through `npx`: ```bash npx rea-agents@latest setup ``` If you're using an agent, complete the [setup refresh](#update-rea) and restart it. Retry the same task. If the problem persists, [open an issue](https://github.com/morluto/rea/issues) with your REA version, target type, steps to reproduce and error output.
## Documentation Start with the website's [worked guides](https://rea.tools/guides/). For exact options, prerequisites and result contracts: - [Installation and setup](docs/installation.md): agent registration, provider configuration, updates and uninstall. - [Readiness and troubleshooting](docs/installation.md#check-readiness-for-your-task): diagnose one agent or analysis engine. - [CLI and Evidence](docs/cli.md): commands, provider selection, snapshots, import/export and exit statuses. - [MCP contracts](docs/mcp-contracts.md) and [agent prompts](docs/mcp-prompts.md): tool results, sessions and guided investigations. - [Tool catalog](docs/mcp-contracts.md#generated-catalog): generated inventory of tools, providers and CLI commands. - [Roadmap](docs/roadmap.md): planned work and capability trackers. Report vulnerabilities through [SECURITY.md](SECURITY.md). ## Star history 🎉 **80,000 GitHub stars — thank you!** Thanks to everyone using REA, reporting bugs, requesting features, testing builds, and contributing fixes. REA GitHub star history ## Disclaimer REA provides tools for lawful reverse-engineering research, analysis, and reconstruction. You are responsible for obtaining any required authorization and complying with applicable laws. The project does not endorse illegal or unauthorized use. REA is an open-source software project. We have not issued or endorsed any cryptocurrency or token. Tokens using the REA name are not affiliated with the project. ## Contributing We'd love your help with REA! [Open an issue](https://github.com/morluto/rea/issues) to report a bug or suggest a feature, or [send a pull request](https://github.com/morluto/rea/pulls) to improve the code or docs. See [CONTRIBUTING.md](CONTRIBUTING.md) for development setup and checks, [testing](docs/testing.md) for verification lanes, and the [architecture map](docs/architecture.mermaid) for the project structure. ## License [MIT](LICENSE)