Edgar Arakelyan
538017d1d2
* feat(environment): render more read tools from the state and describe responses
Keep main's environment serving and fold in coverage for non-entity reads,
response summaries, and MCP tool annotations.
Squashed rebase of #5352 onto main.
* fix(environment): keep rendered documents and quoted samples inside their budgets
A recorded body of exponential numbers can render past 256 KiB and turn a
working read into a state size error, so that document stays a recorded replay.
Description samples are measured after JSON quoting, and the replay-fallback
catalog check uses a tool count the longer response descriptions still separate.
Co-authored-by: morluto <morluto@users.noreply.github.com>
* feat(environment): apply evidence-gated write effects to the served state
Serve write tools whose later reads confirm the effect, and keep main's
state-file ownership and part-wise reply measurement.
Squashed rebase of #5600 onto the rebased #5352 tip.
* fix(environment): bound and validate write state history
* feat(environment): render more read tools from the state and describe responses
Keep main's environment serving and fold in coverage for non-entity reads,
response summaries, and MCP tool annotations.
Squashed rebase of #5352 onto main.
* fix(environment): keep rendered documents and quoted samples inside their budgets
A recorded body of exponential numbers can render past 256 KiB and turn a
working read into a state size error, so that document stays a recorded replay.
Description samples are measured after JSON quoting, and the replay-fallback
catalog check uses a tool count the longer response descriptions still separate.
Co-authored-by: morluto <morluto@users.noreply.github.com>
* feat(environment): apply evidence-gated write effects to the served state
Serve write tools whose later reads confirm the effect, and keep main's
state-file ownership and part-wise reply measurement.
Squashed rebase of #5600 onto the rebased #5352 tip.
* fix(environment): bound and validate write state history
* fix(environment): bound additional collection history
* fix(environment): credit sent fields, negative sequences, and encoded targets
A later overwrite copied surviving derived fields into the sent-member
claim, so a members-only check rejected an update whose sent field still
matched. Serving floored sequences at zero and stored missing history as
zero, so a collection sequence learned from negative ranks skipped the
next value. An absence after a delete forgot the resolved collection, and
an encoded read could not observe an update spelled with another
collection encoding.
Regression tests cover each case.
Co-authored-by: morluto <morluto@users.noreply.github.com>
* test(environment): cover resolved encoded update identities
* fix: validate timed update observations
* fix(environment): share write overlap and check clocks on earlier calls
Observation search skips a read begun before the write ended. That
comparison now uses the same overlap as the check path.
A clock learned on a later call was not checked against earlier calls
that kept the field. Serving would stamp those calls too, so the plan
stays unserved. A clock learned earlier is still refused when a later
call does not advance it.
Regression tests cover an overlapping empty update and a published_at
clock that one recorded call leaves unchanged.
Co-authored-by: morluto <morluto@users.noreply.github.com>
* fix: preserve partial update evidence
* fix(environment): let an unmodelled write explain only the list members that differ
A failed whole-list read now reports which members alone account for the
difference. An unmodelled write excuses the read's writes only when it came
after each such member's last check and pending writes, so an older change
elsewhere no longer hides a newer write the list shows undone.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
(cherry picked from commit 7b6aab9d7191e600051693f2c192afcfc743d083)
* fix(environment): explain added fields, tie creates to serving's collection, and bound write descriptions
An update explains a field the entity lacked before when the observing
view had shown the entity, so a server-filled field is not dropped. A
create is tied to the held collection serving picks for its path. Write
descriptions and body refusals quote member names and sample them within
a byte bound. The request body is indexed once per explanation, so copied
and slugged fields no longer rescan it.
Replays 07aca54e onto the restacked branch. Its rule that a read begun
before a write ended teaches nothing is already here (fb6785dc), so only
its test is kept.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* docs(environment): state how list reads weigh unmodelled writes, added update fields and quoted members
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* refactor(environment): keep the observing view helpers with the observations
shownBefore and the item-or-list fields check move to the observe module,
keeping the write effects within the line limit.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* fix(environment): resolve unmodelled writes onto the held collection
An unmodelled path kept the request's collection spelling. An archive under
the plain spelling of a collection held encoded marked only that plain
collection unknown, so a later update was blamed for the archive's fields
and dropped. Name that entity the way a modelled write does.
Co-authored-by: morluto <morluto@users.noreply.github.com>
* fix(environment): confirm no write through volatile fields or overwritten replacements, and bound the served clock
A members-only check no longer compares volatile fields, which render
from the read itself. A document replacement credits the members it
wrote or removed at its object, so a later merge that overwrites them
takes its confirmation away. A recorded time past the range of a date
gives no served clock instead of throwing.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* fix(environment): leave unknown entities unchecked by failed reads, volatile fields and unchecked calls
A failed item read that is no absence leaves an unknown entity unknown, so
a later usable read still checks its writes. A read showing an unknown
entity again checks no write on a volatile field. An update of an unknown
entity takes its recorded outcome and adds nothing to a built plan. A later
update that does not answer with its entity is observed only by a read
whose view shows every learned clock; without one it is unmodelled.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* fix(environment): fill a create's path fields from the collection serving selects
The gate built a later create's path fields from the recorded request path,
while serving fills them from the held collection it selects for that path,
so a read showing the other spelling's parent could confirm a create serving
cannot reproduce. Rules still learn from the recorded path.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* fix(environment): name unmodelled writes as modelled ones, count fields updates write, and keep later members' types
An unmodelled write below an item path names its entity through itemTarget,
and one at or above a collection resolves the held collection, as modelled
writes do, so an encoded spelling no longer hides the entity it changed.
An update's answer counts the fields its rules write, other than increments,
as available, so a field only the update writes no longer makes it
incomplete-entities. A member a later call first stores keeps that call's
JSON type in the body's kinds, which the body check falls back to.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* fix(environment): let a document replacement overwrite everything under its object
A replacement claims only the members it wrote or removed, but it now
overwrites every earlier effect under its object, so a merge that wrote
the object it replaces loses its confirmation.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* fix(environment): start the served clock from the records whose times a date can hold
A record timed past the range of a date no longer leaves the served clock
without a start, which the store read as zero and stamped writes in 1970;
the clock starts after the latest record a date can hold.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---------
Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: morluto <morluto@users.noreply.github.com>
Co-authored-by: morluto <76467478+morluto@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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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.
Quick start · How REA works · What you can analyze · Showcases · 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.
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 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/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 supports Claude Code, Codex, Cursor, Gemini CLI, Grok Build and other agents. See installation and setup for provider configuration and manual MCP registration.
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.
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.
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 |
|---|---|---|
| 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 or IDA; 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 |
| 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 |
| 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 |
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
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.
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
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.
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 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.
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:
- Installation and setup: agent registration, provider configuration, updates and uninstall.
- Readiness and troubleshooting: diagnose one agent or analysis engine.
- CLI and Evidence: commands, provider selection, snapshots, import/export and exit statuses.
- MCP contracts and agent prompts: tool results, sessions and guided investigations.
- Tool catalog: generated inventory of tools, providers and CLI commands.
- Roadmap: planned work and capability trackers.
Report vulnerabilities through SECURITY.md.
Star history
🎉 300,000 GitHub stars — thank you!
Thanks to everyone using REA, reporting bugs, requesting features, testing builds, and contributing fixes.
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 the project structure.
License
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.