131fbe0754
* feat(environment): serve the writes callers make without recorded form fields
- A create member a recording sent empty ("", null, false, [] or {}) is no
longer required; a call that leaves it out is applied as sending that value
(body.blank).
- List views render envelope members that list the listed entities' ids
(Paperless's `all`), so creates in such collections are confirmed.
- Updates move their entity in collections kept sorted by a field they write,
and a failed whole-collection read after an update can teach that order.
- A later create that stores an unruled field otherwise is withheld at the
create, and an item read may fill values a create's answer had not loaded.
- An unsent field respelled between null, [] and {} is unchanged.
- The skill asks for one create with every field and one with only what a
person must give.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* docs(skill): show how to read signed-in pages before recording
Agents guessed capture keys (artifacts, dom, final) to see pages behind
sign-in, which inspect_web_page cannot reach.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): accept every empty spelling recorded creates sent
A create that fills only what a person must give sends `null` where the
full create sent a string, and `null` or `false` for the same flag. The
merged plan now accepts each recorded empty value, and a call that leaves
the member out is applied as the earliest call sent it.
Also adds the spec folder for this change.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* docs(skill): keep the vary-fields step neutral on UI or API writes
Agents read "the form" as a cue to write through the UI, where some
applications' request bodies are not exposed; a body-unusable UI write
now re-records once with request steps.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* docs(environment): record verification for blank members and sorted writes
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): address review of blank members and sorted writes
- Bulk updates move their entities in turn against the others' earlier
values and install the final order once, as replay does.
- A member's recorded empty values stay accepted once a later call teaches
its default; a left-out member with a default keeps the default.
- Write answers spell empty lists and maps as their recorded answers did.
- A rename can teach a sort when the creates chose one by a field the
update did not write, such as ids that ascend with titles.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* feat(environment): serve the writes that later reads explain
- An item read whose object is marked deleted (deleted, isDeleted or
is_deleted true) agrees with an absent entity, as EspoCRM answers a
deleted record; such an object never seeds or adopts an entity.
- maxSize, max_results and maxResults are page sizes, for whole-collection
list lines and the list query's limit role.
- An item view also shows the fields only reads after its type's first write
show, when no initial entity holds them (Vikunja's task subscription),
without requiring them; write answers leave such a field out for entities
without it, and it no longer withholds the write as incomplete-entities.
- The skill asks updates to change the fields a person would change, and
expects a deleted object to read back as 404 or marked deleted.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): answer sent empty members as sent, and keep a placed create's order
- A write answer spells an empty list or map the call did not send as its
recorded answer did; one the call sent is answered as sent, so a create
sending `[]` is not answered `null` because the first recorded create was.
- A read listing the whole collection that placed a create leaves the create
only the sorted inserts whose order that read follows, so a later rename
cannot teach a sort an earlier read ruled out.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): answer bulk updates without fields only later reads show
A bulk update's answer renders each entity with the same allowance a single
update's answer has: a field only reads after the type's first write showed,
which no initial entity holds, is left out for an entity without it, so a
bulk update of a seeded task is no longer refused for lacking it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* docs(environment): correct how the EspoCRM contact update task passes
The agent trajectories show gpt-oss passes it by creating a replacement contact
and deleting the original, since the served update refuses emailAddress; the
update itself is refused in both builds.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): answer a read of a served-deleted entity marked deleted
An application that soft-deletes still answers a deleted record by id, marked
deleted. Serving now keeps an entity a served delete removed from a type whose
recorded item reads show that, until a reset or load and within the size
data/add loads, and answers a read of it with its last fields and the flag
true, instead of refusing the read.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): keep unloaded create answers, check bulk answers with sent members, narrow inserts only on collection-order reads
- A create whose item read loaded values its answer had not records them
(`observation.read.unloaded`), and a served create's answer keeps them as
the recorded answer showed them, a zero-time owner included, while the state
holds the read's.
- Replay checks a bulk update's recorded answers with each target's sent
members, as serving answers them, so echoed `null` and `[]` no longer make
the plan body-unusable.
- A whole-collection read whose query sorts it shows the query's order, so it
no longer narrows a create's sorted insert candidates.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* docs(environment): record the census with main's unknown-clock rule merged
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* feat(environment): serve query numbers, counted values and made objects
- A query parameter accepts a number or boolean, which serving sends as its
JSON text, as agents send page sizes and flags.
- A sequence may start at the value its first create took above every value
its type held (Vikunja's per-project task index), and a later create's
composed, template or started-sequence rule is adopted when it also spells
the first create's value.
- A made-object rule explains an object the application makes with each
created entity: members the request stamped, members holding the entity's
own id, and counts one past the held objects' values.
- A create's answer names the id of the one object a one-element array member
holds, so bulk creates link to their type.
- The skill reads each listed object by id before writing.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* feat(environment): let a linked create take path values it stores
A create linked to its type's own collection, whose path has no parameters,
accepts any path values when its plan stores each one in a field, as a Vikunja
task stores its project; replay and serving apply it alike.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): learn a sort from a rename only when moving its entities reaches it
Serving moves only the entities a write changes in a collection kept sorted,
so replay now tries a sort after a rename only when the entities no write the
read exercised changed already follow it. Seeded folders listed out of title
order no longer teach a title sort that serving would answer with another
order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): keep unloaded create answers a sent value did not echo, and learn no sort from query-sorted reads
- A served create keeps a value its recorded answer had not loaded unless the
call sent that member and the plan stores it as sent, so a create sending
`active: false` is answered `false` as recorded while the state holds the
read's `true`.
- A rename no longer teaches a sort from a whole-collection read its query
sorts, whose ties need not follow the collection's own order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* docs(environment): verify query values, counted values and made objects
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): learn the soft-delete flag in the state view and serve by it
Extraction now records the member later item reads set true on a record the
application soft-deleted, and the item view carries it as `deleted_flag`.
Serving reads that fact instead of scanning recorded bodies itself, so one
owner decides what a soft delete looks like.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* docs(environment): record the call-values checks at #7274 93821024
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): learn the soft-delete flag from item reads with a query too
A client may read a deleted record back only with a query, such as a
cache-busting parameter. Every successful read of the item tool now shows the
flag; only plain later reads still add fields.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* docs(environment): record the call-values checks at #7274 45832406
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): learn sorts only from orders a list read confirmed
- A sort retry after a failed whole-collection read requires the entities no
write changed since a list last showed them to follow it already, rather than
excusing every entity the update's tool ever wrote: an earlier rename a list
confirmed in place stays where it was.
- An update takes its creates' sort only from a create a list read showed
placed; replay still tries a sort a create guessed from the initial order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): drop entities read back as deleted and answer soft deletes as deleted
- A held entity a later read shows marked deleted is dropped, not adopted with
the marked object's fields.
- Bulk-update replay renders answers with the optional and later-only fields
serving uses, so a bulk update of created and seeded entities replays.
- A served delete of a soft-deleting type answers with the entity marked
deleted, single and bulk.
- A deleted flag only query reads showed is a field of the item view, so a
served tombstone keeps it where live records omit it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): check made objects as recorded and keep their ids and clocks honest
- A made object's clock counts as a write clock, so a capture with no clock
anchor withholds the create instead of stamping 1970.
- Members holding the entity's identity follow the id written, generated or
sent, through the type's id field.
- A later create's made object is checked as recorded, before its own members
are rewritten, so one naming another entity withholds the plan.
- A later create's template is adopted only when it spells that create's value
too, not just when the first create's text holds its source value.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): move updated entities only by placed sorts and keep query-sorted reads from confirming order
Replay moved an updated entity by a sort a create only guessed, while the
update plan exported only placed sorts, so a read could confirm an update
by a move serving would not make. Both now use the placed sort. A passing
list read clears its entities from the moved set only when the state
decides the order of every entity it lists, so a read whose query sorts
it no longer hides an earlier move from a later sort check.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* docs(environment): count six withheld plans that explain more, not seven
The bulk task create counted among them is served on this branch.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): try a learned sort by moving each pending write in turn, as serving does
#retrySort sorted the whole collection, which a list could match while
serving, moving each renamed entity in turn against the others' values
before their own writes, gave another order. The state now records the
values each write replaced, and the retry replays the writes since a
list in collection order last showed their entities.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): answer a served delete with the deleted flag its recorded answer showed
An application may answer a delete with the record as it was and mark it
deleted only on later reads. Delete answers, single and bulk, now take
the flag's value from the recorded answer; reads of a served-deleted
entity still show it marked deleted.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* chore(environment): set aside two hunks next to lines main's saved-values change rewrites
Main's #7267 changes the lines beside the blank-member docs and the
empty-spelling check in explainUpdate. Setting them aside lets that merge
apply cleanly; the commit after it puts them back on top of main's text.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* chore(environment): restore the set-aside hunks on main and bump the skill to 51
Puts the blank-member docs and the empty-spelling check back beside main's
slug and composed text and heldSlugRule. Main is at skill 50 with
different text, so this branch's skill changes take 51.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* chore(environment): bump the skill to 52 above #7260's 51
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* chore(environment): put back the call-values hunks main's merge took its side for, and bump the skill to 53
The merge of main kept main's side where it overlapped this branch, so it
could commit without a conflict. This restores this branch's side next to
main's: made-object agreement beside the & slug spellings, sequence starts
in the earlier evidence (now built by earlierOf), the combined value
imports, and recording step 2 beside main's UI-first step 3. Main is at
skill 50 and #7274 at 52, so this branch takes 53.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): keep sorts a list showed in place ruled out, and created answers' nested members as recorded
A whole list in collection order that showed a renamed entity where a
sort by the renamed field would have moved it now rules that sort out, so
a later rename of the same entity cannot teach it. A create's answer
leaves out members its item read added inside an object the answer
showed, as the recorded answer did; the state still stores them.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* feat(environment): serve writes whose calls send different members
Recordings now vary what a type's two creates and updates send, and REA
withheld writes where a later call left out what the first sent. An update
plan's required members narrow to those every call sent; a member one create
sent and another left for the application to number is a sequence that
takes the value a call sends; a PUT's left-out member the application
cleared becomes that member's default; and an update's clock is held as
the read after it spells it. The skill spaces creates (skill 54).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): keep a later create's made object only with clocks its request stamped
followsMadeObjects only checked that a made object's clocks parsed, so a
later create whose object showed an older clock still passed, while serving
stamps the write's clock. Its clocks must now be in the rule's format and
within the stamp window of that create's request.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): accept sent values either way, check defaults against every call, and store update clocks as reads spell them
A sequence that takes sent values now accepts one a later create sent
after the first left the member to be numbered. A default an update learned
must agree with every update that left its member out, else the plan is
withheld. An update plan whose read-back spells a stamped clock at a coarser
precision keeps that read as observation.read, and serving stores the
update's clocks in its spelling while answers keep the response's.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): check recorded member and sequence values
* fix(environment): compare soft-deleted read fields
* fix(environment): reject contradictory learned sequences
* fix(environment): preserve initially deleted item observations
* fix(environment): index stored deleted entities separately
* fix(environment): replay lists that include deleted records
* fix(environment): count a sequence number a create sends, as replay does
Serving now records a number a call sends for a `sequence` with `sent` in the
same count history it generates from, so after that entity is deleted the next
generated number still follows it, as replay's takeSequences does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): make no count of a made-object member earlier creates held alike
A count only a later create shows starts at the exemplar's value, which is
right only while the exemplar is the one create accepted: creates accepted
after it showed the member unchanged, which a count would have moved. The
merge now refuses such a count, as the top-level sequence check does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): check PUT defaults against reads, and respell update clocks by serving's rule
A default a PUT learns must also agree with what the read after an earlier or
the current call showed for the member its answer left out, so a call whose
read showed the member kept withholds a later clearing default.
Replay and serving now choose an update clock's stored spelling by one rule,
readSpellsCoarser: the read after it at a coarser precision in the same zone
and separator. A read in another zone or separator is no longer adopted by
replay, which serving could not store, and a create's plain clocks stay as
answered, as serving makes them.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): keep the largest sequence value in replay, and store update clocks by the kept read
Replay now keeps the largest value a sequence took, as serving's commitWrite
does, so a lower sent value no longer lowers the next number.
Serving stores every update's clocks in the spelling of the read the plan
keeps as observation.read; replay now does the same through
readSpelledClocks, instead of adopting each update's own read, so a later
update whose read spells its clock otherwise contradicts the plan. The plain
clock branch of restampedFields, which no caller used any more, is gone.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): keep a left-out default from numbering, a read's sub-millisecond digits, and references named by member
A member a call left out and the application stored a fixed value for is no
longer turned into a numbered sequence by a later call that left it out.
Serving shortens an update's clock to the read's precision from the answer's
own digits, keeping microseconds. A PUT that names a reference field's entity
by its member supplies that field, for the default check and in serving.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): count a reference a later PUT names toward the default an earlier one cleared
The default check now reads the reference rules the current call shows as
well as the plan's, so a PUT naming the owner by ownerId after one that
cleared it is served, as in the other order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): number a left-out member past every sent value, and never fill it with a sent blank
A later create the application numbered at or below a value an earlier create
sent no longer turns the echo into a numbered sequence, since serving counts
past every sent value. A member a numbered sequence covers is not filled with
an empty value another call sent when a call leaves it out.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
* fix(environment): count sent values in the sequence's scope before numbering a left-out member
The largest value earlier creates sent is kept by type and by collection, and
a collection-scoped sequence adopted later checks only its own collection, so
a number sent in another collection no longer withholds a create numbered
within its own.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
---------
Co-authored-by: Claude Opus 5.5 <[email protected]>
Co-authored-by: morluto <[email protected]>
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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 · 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.
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/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.
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 |
| ELF notes | PT_NOTE/SHT_NOTE owners, types, GNU build-id and ABI-tag fields | Built-in static ELF inspection; ELF notes |
| 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 |
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
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:
- 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
🎉 400,000 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 selected layers and dependency paths.
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.