Files
reverse-engineering-anything/README.md
T
22f28644fe feat(artifacts): inventory and extract Deno compile executables (#8527)
* feat(artifacts): inventory and extract Deno compile executables

Adds Deno standalone artifact support for Mach-O, ELF, and PE carriers,
exposing virtual files, entry points, recorded options, and file digests
without running the executable. Extraction uses the existing safe output
tree, preserves symlink targets as metadata, and assigns indexed paths
to unsafe or oversized names. Environment-file values and certificate
bytes remain in local Evidence; npm snapshots are reported by length
without decoding. The documentation describes supported layouts, parsing
limits, and refusal behavior.

* fix(artifacts): resolve nested Intel Deno carriers to the enclosing app

The backward trailer search stopped at the first confirmed sentinel, so an
Intel app storing another Intel Deno executable as a virtual file reported
the inner app. Search to the slice start, drop sentinels inside a confirmed
payload, and fail closed on side-by-side trailers that differ.

Correct the docs on retained environment values and generated regions.

* fix(artifacts): keep Deno coverage, remote paths and PE resources truthful

Report unknown coverage when the virtual filesystem cannot be listed, keep
resolved specifiers when another remote ID is missing, and percent-encode
characters in remote paths that a Windows destination would refuse. Reject a
directory at the PE resource language level, and correct the guide's
description of colliding generated regions.

* fix(artifacts): normalize Deno remote escapes so hex case cannot collide

Uppercase every percent escape in a generated remote path, so specifiers that
differ only in escape case reach the path registry as one name and the second
gets an indexed path instead of colliding on a case-insensitive disk.

* fix(artifacts): fail closed on truncated enclosing Deno trailers and encode reserved remote path characters

The Intel trailer scan rejected an overlong sentinel before reading its
marker, so a truncated enclosing app vanished and the nested app was
reported. Read the marker first and fail closed when a confirmed overlong
trailer encloses another trailer.

encodeURIComponent leaves `*` alone and the sanitizer covered only part of
the Windows reserved set. remoteDestination now encodes the whole set once
as uppercase percent hex; source_path keeps the original.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KuWHGvzJkrhCqjtEHUwqyH

* fix(artifacts): defer truncated Intel Deno trailer failure until enclosing trailers resolve

A damaged Intel asset stored before a valid one inside a valid app made the
backward trailer search fail before it reached the outer trailer. Hold that
failure until the search ends and drop it when a confirmed enclosing trailer
holds the sentinel as data.

* fix(pe): fail closed when a resource type branch is unreadable beside a found name

namedResourceTargets skipped a type branch whose names directory, or a
name entry whose string, could not be read. A duplicate RT_RCDATA entry
pointing out of bounds therefore vanished once another branch matched,
and locatePeResourcePayloads returned only the readable ranges while
parsePeResources rejected the same tree.

The walk now records unresolved branches. hasPeResourceName still
reports false for a tree that never reaches the name, but once
locatePeResourcePayloads finds the name it raises a format failure if
any branch was left unresolved.

* fix(artifacts): skip Intel Deno sentinels that a native segment maps

A non-Deno x86_64 Mach-O that stores an Intel Deno executable in __DATA
had the asset's trailer promoted to the root application, because the
backward sentinel search never checked who owned the bytes it scanned.

locateMachOSlice now records the file ranges of every segment other than
__SUI and __LINKEDIT (libsui extends __LINKEDIT over the trailer), and
the Intel search skips any sentinel inside one of them. A slice whose
load commands do not frame stays with native inventory, since ownership
cannot be shown there.

* fix(artifacts): reject a universal Deno image with an unreadable sibling slice

The universal Mach-O locator skipped any slice whose load commands could
not be read or framed, and any slice with a FAT range issue. When another
slice confirmed Deno, that slice was reported as the whole image, so a
sibling declaring a different Deno application went unexamined.

locateMachOSlice now reports why part of a slice was not examined
(unreadable or unframed load commands, a truncated slice, or the Intel
sentinel allowance). locateMachO collects those reasons for every
declared and hidden slice and fails closed once any slice confirms a
Deno section. With none confirmed, the image stays with native inventory
as before.

* fix(scripts): supervise the Deno verifier version check

Run `deno --version` through the verifier command owner with a deadline
instead of raw execFile, and close the owner when the version is refused.

* fix(artifacts): keep unconfirmed Deno carriers native and fail truncated Intel trailers

An ELF SUI note whose descriptor is too short for the full d3n0l4nd name
now stays unconfirmed instead of failing closed; failures after the name
matches still fail closed.

Every marker-confirmed Intel trailer whose payload runs past the slice is
now kept until the backward search ends and fails unless an enclosing
payload contains it, so an Intel Deno app missing its last byte reports a
Deno failure instead of native inventory.

The Deno MCP boundary test now calls open_binary and inspect_artifact
through artifactMcpCall, as docs/testing.md requires.

* test(deno): drop source-text checks from verifier pin test

Keep the wrong-version subprocess check, which covers the pinned
release through behavior, and stop asserting on the verifier script's
source spelling.

* test(deno): close readers in finally in symlink and cancellation tests

A failed assertion or read error in either test skipped reader.close(),
leaving the file open while temp-directory cleanup ran. Both tests now
close the reader in finally, as CONTRIBUTING.md requires. The
closed-reader assertion in the symlink test stays after the finally.

* docs(specs): add deno-standalone spec, plan and tasks

Add docs/specs/artifacts/deno-standalone/ with spec.md, plan.md and
tasks.md for the Deno compile executable reader, as AGENTS.md requires
for a feature, and list them in the specifications index.

* docs: list the Deno compile guide in the documentation sidebar

* fix(deno): confirm the d3n0l4nd section before claiming Mach-O damage

A __SUI segment alone no longer makes later load-command damage Deno's.
A Mach-O whose __SUI segment holds only a differently named section now
stays absent and keeps native inventory, while damage seen before or
beside a confirmed d3n0l4nd section still fails closed.

* fix(deno): keep a slice with an unparsed segment command unread

A Mach-O segment command that frames but cannot be parsed may be the
__SUI segment, so the slice is no longer treated as fully examined. A
universal image whose other slice confirms Deno now fails closed instead
of letting that sibling supply the whole inventory, and with no confirmed
sibling the image still keeps native inventory.

* fix(deno): confirm an ELF SUI note before rejecting its length

A SUI note whose descsz runs past its note table was recorded as plain
damage before its descriptor name was read, so a malformed Deno carrier
fell back to native inventory. The owner and the d3n0l4nd name prefix are
now read within the table apart from the claimed extent, and a confirmed
note with an oversized extent fails closed.

* fix(deno): confirm a truncated __SUI section record by its name

A section record cut short after its 16-byte name was skipped, so a
damaged Deno carrier fell back to native inventory. The name is now read
apart from the rest of the record, and a truncated record that names
d3n0l4nd fails closed. The range checks for a confirmed record move into
their own helper.

* fix(deno): reject nonzero bytes after the last ELF note

When fewer than 12 bytes remained in a note table after its last note,
the walk stopped without looking at them, so a Deno note was selected
with complete coverage beside unaccounted data. The remainder is now
read: zero padding is accepted, and nonzero bytes are recorded as damage,
which fails closed once a SUI note is confirmed and otherwise leaves the
ELF to native inventory, matching the native note parser.

* fix(deno): validate FAT slice identity before choosing the search

The locator took a universal slice's CPU type from its FAT row, so a row
that called an x86_64 slice arm64 skipped that slice's Intel trailer and
let the arm64 payload stand for the whole image. Each slice's header is
now checked against its row with validateFatSliceIdentity. A mismatch
leaves the slice unread, so a universal image whose other slice confirms
Deno fails closed. The Intel fixture header now states
CPU_SUBTYPE_X86_64_ALL so its FAT rows can match it exactly.

* fix(deno): check the Intel trailer marker before judging its length

A trailer length word of 2^53 or more was dropped before its d3n0l4nd
marker was read, so an enclosing app with that length was skipped and a
nested app's range stood for the whole image. The marker is now read
first, and a marker-confirmed trailer whose length runs past the slice,
safe or not, joins the deferred truncated candidates and fails closed
unless an enclosing trailer holds it as data.

* fix(deno): count short ELF note tables against the note allowance

A note table shorter than one note header made a read of its trailing
bytes but counted no note, so many distinct tiny tables could force one
sequential read each past the 256-note allowance. Every nonempty table
now counts at least one entry, both in the up-front estimate and while
scanning, so an image past the allowance records the limit instead of
reading every table. The trailing-byte check moves into its own helper.

* fix(deno): fail closed on ELF extended section numbering beside a SUI note

A zero e_shnum with a nonzero e_shoff moves the section count into
section zero, so the section table was skipped and its SHT_NOTE tables
were never compared. Record it as damage, as PN_XNUM already is, so a
confirmed SUI note fails closed instead of reporting full coverage.

* fix(deno): keep undersized Intel trailers until enclosing ownership is known

A trailer length word below 8 was dropped before its d3n0l4nd marker was
read, so an enclosing app with a length of 0 to 7 was skipped and a nested
app's trailer was selected as the root. The marker is now read first, and a
marker-confirmed trailer too short to hold it is kept as malformed and fails
closed unless an enclosing trailer holds it as data.

* fix(pe): treat non-directory RT_RCDATA branches as unresolved

A duplicate typeId root entry whose target is a data entry was skipped
without marking the walk unresolved, so locatePeResourcePayloads returned
the readable named resource as complete. Route non-directory type
branches through the same unresolved path as unreadable names
directories so the Deno reader fails closed.

* fix(deno): fail closed on a zero-fill d3n0l4nd Mach-O section

denoSectionRange admitted the declared offset and size of a confirmed
__SUI,d3n0l4nd record without checking its section type, so a
S_ZEROFILL, S_GB_ZEROFILL or S_THREAD_LOCAL_ZEROFILL section could be
read as a file payload while MachoImage reports it as not file backed.
Reject zero-fill types with the shared isMachoZeroFillSection predicate
before assigning a physical range.

* fix(deno): bound the d3n0l4nd Mach-O section by its segment file extent

denoSectionRange checked a confirmed __SUI,d3n0l4nd record only against
the slice and file bounds, so a section reaching past its segment's
fileoff/filesize was still read as a complete payload while MachoImage
reports the same section as not file backed. Reject a section outside
its enclosing segment's file extent before admitting the physical range.

* style(deno): apply oxfmt to the DenoStandaloneLocation embedding union

* fix(artifacts): preserve Deno carrier ownership

* fix(artifacts): admit Deno parent segments

* fix(deno): preserve native segment ownership

* test(deno): cover mismatched Mach-O segment widths

---------

Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: morluto <76467478+morluto@users.noreply.github.com>
2026-11-09 21:43:01 +08:00

32 KiB
Raw Blame History

English · 简体中文 · 繁體中文 · 日本語 · 한국어 · Türkçe · Русский · Tiếng Việt · ไทย · Deutsch · Español · Français · Українська · Polski · Português (Brasil) · العربية · فارسی · Bahasa Indonesia · Italiano · Ελληνικά · മലയാളം · Roman Urdu · Română

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 MCP tool catalog Node.js requirements skills.sh MIT license Discord

morluto%2Frea | Trendshift

Website · Guides · Showcases

Join the REA community on Discord

Quick start · How REA works · What you can analyze · Showcases · Build RL environments · FAQ · Documentation

npx rea-agents setup

Important

Get REA from morluto/rea, rea.tools, or the rea-agents npm package. Follow the installation and release links from these official sources. A similar repository name or copied README does not establish that a download is official.


REA launching its analysis bridge inside Hopper while inspecting a native binary



Discord
Join the Reverse Engineering Community

Discord · Q&A · Show and Tell


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, IDA or Kuna installation; setup can optionally install Hopper with approval. Static JavaScript analysis needs no native analysis engine.

Visit the REA website for setup instructions, illustrated guides, and real case studies.

Quick start

On Linux, Ghidra, JADX, firmware tool launches and static JavaScript/Electron analysis require a procps-compatible ps on REA's PATH for process ownership checks. Recovery steps are in docs/getting-started/installation.md under "Linux owned-process prerequisite".

Set up your agent

With Node.js and npm installed, run:

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 records the selected runtime and REA entry script directly. If acquired through a package runner, keep its cache entry available. Run package acquisition from a trusted directory outside the target project. Installation and recovery details are in the setup guide below.

Setup supports Claude Code, Codex, Cursor, Gemini CLI, Grok Build and other agents. See installation and setup for provider configuration and manual MCP registration and Claude Code/Codex plugin installation.

MCP uses compact input schemas by default to reduce context overhead. Set REA_MCP_INPUT_SCHEMA_PROFILE=full in your MCP registration when you need the complete advertised field guidance and nested validation details. Both profiles keep the full tool set and canonical server validation. See "Compact input schema profile" in the MCP contracts guide.

Complete output schemas are advertised by default. If your client caps the complete tools/list frame, set REA_MCP_OUTPUT_SCHEMA_PROFILE=compact to bound each advertised output schema, or off to omit output schemas entirely. Both settings keep canonical server-side validation and complete structured results. See "Output schemas" in the MCP contracts guide.

Ask your agent

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:

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:

npm install --global rea-agents
rea --help

For native analysis, configure a provider first. See the CLI and Evidence guide 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:

rea update

rea --update is an alias for this verified workflow and accepts the same global output flags. Use rea update when combining it with other command controls.

Updater commands retain at most 4 MiB of stdout and stderr combined. Oversized metadata replies are rejected after the command exits; verbose installs continue with bounded diagnostics. Human progress output respects terminal backpressure and waits for submitted writes to finish.

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:

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.

Open the full-size figure.

What you can analyze

REA requires Node.js 22.x (>=22.23.4), 24.x (>=24.22.1), or 26.12.1+, plus npm. Additional tools and host support depend on the target:

Target What REA returns Requirements and guide
Desktop installations Runtime candidates, supporting files, component markers and next probes Built-in bounded directory/header inspection; desktop applications
Native binaries Pseudocode, assembly, strings, symbols, calls and references Hopper, Ghidra, IDA or Kuna; native analysis
Offline ELF layout Sections, segments, original symbols/relocations and static mitigation candidates Caller-supplied pwntools on Linux x64; binary diagnostics
Go binaries Embedded compiler version, modules, replacements and build settings Built-in static ELF/PE/thin Mach-O inspection; no Go installation required
GPU code objects CUDA/HIP targets, selected kernel parameters and resources, retained PTX text Built-in static ELF/PE/fatbin/CUBIN/PTX inspection; GPU code objects
Model artifacts GGUF / safetensors metadata, tensor declarations and derived totals Built-in header inspection; optional full-file hash; model files
IL2CPP metadata Unity global-metadata.dat assembly images, type and method names and index ranges Built-in static decoding of versions 24, 27, 29, 31 and 39; no Unity required
Godot PCK Archive inventory and extraction, original header/directory facts and selected content identities Built-in static formats 2, 3 and 4; no Godot required
Rust binaries Embedded cargo-auditable crate names, versions, sources and dependency edges Built-in static ELF/PE/thin Mach-O inspection; Rust binaries
PE certificates Authenticode WIN_CERTIFICATE entries and PKCS#7 signer/X.509 identity fields Built-in static PE inspection; PE certificates
PE imports Import and delay-load DLL names, ordinals, IAT RVAs and pefile import hash Built-in static PE inspection; PE imports
Windows shortcuts Shell Link target, arguments, working dir, ExtraData and Tracker droid facts Built-in static LNK inspection; Windows shortcuts
ELF notes PT_NOTE/SHT_NOTE owners, types, GNU build-id and ABI-tag fields Built-in static ELF inspection; ELF notes
Binary hardening PIE, NX, RELRO, CFG and related header flags for ELF, PE and Mach-O Built-in static header inspection; binary hardening
Apple IPS crashes .ips metadata, threads, images, registers and documented crash classes Built-in static JSON inspection; Apple IPS
Linux kernel modules .modinfo keys, __versions CRCs, this_module presence, and signature trailer Built-in static ELF inspection; kernel modules
Erlang BEAM IFF chunks, atoms, exports, imports, lambdas and the Code header Built-in static BEAM inspection; Erlang BEAM
WASM artifact Validation, sections, exact import/export WAT forms and decoded WAT Caller-supplied WABT 1.0.42; inspect_wasm_artifact
EVM bytecode Dispatch selectors, byte offsets, inferred arguments and mutability Local raw/hex carrier on Linux x64; offline EVM guide
SQLite databases Tables, columns, indexes, views, triggers and selected ordinary-table rows Local database/WAL snapshot; Node.js 24.x >=24.15 or 26+ with native SQLite limits
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
JavaScript / Electron Modules, imports, source maps, routes, IPC and native add-on relationships Node.js and npm; Linux: procps-compatible ps; application analysis
Websites Page structure, scripts, network observations and requested screenshots A Chrome-family browser; browser analysis
Saved network captures Requests, responses, exposed payloads and source locations HAR or Fiddler Everywhere SAZ; mitmdump on Linux for native mitmproxy; capture guide
.NET assemblies Metadata, CIL instructions, declared native dependencies and build comparisons None (static only); managed-code guide
Android APKs Manifest declarations, classes, decompiled methods and references Headless JADX and a full JDK on Linux/macOS/Windows x64; Android guide
APK signatures v1/v2/v3/v3.1 signers, certificate fingerprints, key rotation and digest self-consistency None (static only); inspect_apk_signature
Android devices Devices, packages, processes, logs, dumps, screen captures, and APK/file transfers Caller-supplied adb (emulator or hardware); ADB guide
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
Android resources Decoded manifest, string tables, locales and version facts Caller-supplied Apktool launcher; resource guide
Flutter apps Dart snapshot hash, per-ABI library digests and engine build provenance None (static APK parsing); Flutter guide
Firmware Regions, extraction results and native-analysis handoffs Binwalk / Unblob on Linux; firmware guide
Recorded packets Selected fields, repeated values, filters and decode-as rules Linux: TShark 4.x + prlimit; capture guide
Packet summaries Endpoints, DNS, TLS SNI, protocol distribution and HTTP requests Caller-supplied tshark and capinfos (Linux-verified); pcap guide
Recorded logic signals Decoder annotations, sample ranges and diagnostics Linux: sigrok-cli 0.7.2 + prlimit; signal recordings
Packages and resources File inventories, digests, plists, Apple bundle anatomy and extracted resources Artifact and JavaScript guide, Apple applications
Process behavior Terminal output, interactions, exit and filesystem observations, and run comparisons Linux/macOS with a native PTY; process capture
PyInstaller executables CArchive members, Python version, entry scripts and extracted bytecode None (static only); Python packaged applications
Deno compile binaries Virtual files, entry point, recorded options, npm snapshot length None (static only); Deno compile executables

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.

For offline native-binary inspection, REA also supports caller-supplied GNU objdump and Rizin. See the reverse-engineering tools guide for provider setup, CLI commands, and Evidence limitations. REA does not install or update either provider.

Native formats and host support vary by provider. See Hopper and Ghidra setup, the IDA guide (including an optional native MCP bridge), the Kuna decompiler guide, and experimental Windows Ghidra support. Ghidra also supports 16-bit DOS analysis. For large binaries, raise the provider's startup deadline with REA_GHIDRA_STARTUP_TIMEOUT_MS or REA_HOPPER_STARTUP_TIMEOUT_MS. For provider selection, see the CLI guide. Check release availability for features added since the latest npm release.

Showcases

Illustrations of the DX-Ball sound-pan, Notion clipboard-bridge, and TH04 bullet-ring showcases

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 · Reconstruction repository

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

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 · Reconstruction repository

Build RL environments with REA

Record a web app session, turn its API into tools, and export an environment an AI agent can use. Run it with AgentEnv, then add tasks and reward checks for RL training or evaluation.

Read the guide · Watch the video

If you've used REA on something interesting, we'd love to see it. Share your case in an issue or a pull request, including the target, your question, how REA helped, and what you found.

Build RL environments

Give an AI agent a local environment to practice tasks such as finding an issue or creating a folder, without running the original app. Use it for reinforcement learning (RL) or to test how well an agent completes tasks.

REA turns recorded API requests and responses into tools the agent can call. The environment uses the recorded data and supports changes only when the recording confirms their effects.

With REA set up in your agent, replace the example URL and folder tasks below with your own:

Use REA to build an RL environment from my test web app at
http://127.0.0.1:3000.
Cover listing, creating, renaming, and deleting folders. You may create and
remove test folders. Leave existing data unchanged.
Save it in a folder named my-env. Check which operations work and tell me
how to run it.
Use the command line instead

Use these commands if you already have a file containing the app’s recorded browser requests and responses. Running the result also requires AgentEnv and Docker.

rea environment-build ./session.har ./my-env --name my-env --json
agent-env run ./my-env

REA exports a runnable environment with a basic test to check that it starts and responds. Use it with your RL framework to define task goals, add reward checks, and run training.

Build an environment · Environment reference · Watch the demo on X

FAQ

Which agents can use REA?

Any agent that supports local MCP servers. Setup configures the supported agents; other clients can use manual MCP registration.

Do I need a native analysis engine?

Deep native analysis uses Hopper, Ghidra, IDA or Kuna, depending on the target and operation. Static JavaScript and .NET inspection work without a native analysis engine. Setup can install Hopper after approval; Ghidra, IDA and Kuna use your existing installations. See provider setup for the options and their supported targets.

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. Complete that prompt in the same user session before your first CLI/MCP operation or unattended job. Open Hopper manually if needed. See Hopper startup 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.

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 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:

rea update

For agent setup through npx:

npx rea-agents@latest setup

If you're using an agent, complete the setup refresh and restart it. Retry the same task. If the problem persists, open an issue with your REA version, target type, steps to reproduce and error output.

Documentation

Start with the website's worked guides. For exact options, prerequisites and result contracts:

Report vulnerabilities through SECURITY.md.

Star history

🎉 400,000 GitHub stars — thank you!

Thanks to everyone using REA, reporting bugs, requesting features, testing builds, and contributing fixes.

REA GitHub star history

Disclaimer

See DISCLAIMER.md for responsible-use guidance.

The project's position on illegal or unauthorized use covers all REA versions, distribution channels, and platforms; each copy retains its applicable licenses.

REA is for lawful research, education, interoperability, software preservation, and analysis of software you own or are authorized to examine.

Contributing

We'd love your help with REA! Open an issue to report a bug or suggest a feature, or send a pull request to improve the code or docs.

See CONTRIBUTING.md for development setup and checks, testing for verification lanes, and the architecture map for selected layers and dependency paths.

License

MIT

REA-authored code is licensed under MIT. Third-party material retains its own licenses and copyright notices; see Third-party notices for the dependency inventory, preserved license texts, and external-tool terms.

You must legally obtain and be authorized to use commercial tools, including IDA Pro / Hex-Rays decompilers, Hopper, and JEB, under their applicable licenses. REA grants no tool license, key, or activation entitlement. Trials and demos remain subject to vendor terms, including user, feature, automation, and output sharing restrictions. Cracked copies, stolen keys, unauthorized key sharing, and bypassing license restrictions are not authorized. This guidance does not amend MIT or third-party licenses.