Reverse Engineer Anything Agent Skill

REA

Use REA when a claim depends on a shipped binary or package, decompilation,

passive application runtime evidence, controlled replay, or comparison with

behavior not established by available source. For ordinary analysis of a

complete source repository, use normal repository tools and do not run REA

readiness or provider commands.

Route the target first

Choose the first tool from the target the user supplied. Do not call

open_binary unless the target is native or an analysis database.

• ASAR or extracted JavaScript/Electron tree:

analyze_javascript_application.

• Archive, application package, ZIP/APK/IPA/MSIX/AppX, or DMG:

open_binary with the supplied local path, then inspect_artifact or

inventory_artifact (both operate on the active target and accept no path).

• Managed PE/CLI assembly: inspect_managed_artifact.
• User-owned browser page already open: list_browser_targets.
• User-owned Electron runtime already open: list_electron_targets.
• Native executable, library, or analysis database: open_binary, then

binary_overview.

If the app is missing, ask which app to inspect. Resolve a human-readable app

name to one clear installed artifact when possible; ask only when matches are

ambiguous. Never choose an example app on the user's behalf.

In a target-free session, use open_binary to bind any archive/package or

native target whose analysis tool operates on the active target. Do not call a

tool hidden from tools/list; inspect binary_session with

detail: "capabilities" for the exact remediation when a desired capability

is unavailable.

Work summary-first

Start with the default summary projection. Do not repeat an identical tool call.

Do not fetch full Evidence or a full application graph unless a specific claim

requires detail absent from the summary. For JavaScript graphs, follow the

paged resource URIs returned by the summary and fetch only the relevant page.

Every conclusion must distinguish observations, inferences, and unknowns. Cite

Evidence IDs, preserve limitations and incomplete coverage, and never imply

that static analysis observed execution. Ask for approval only where a tool or

policy requires it; approval never broadens a different authority boundary.

Read only the relevant guide

• Native binaries, managed assemblies, archives, and extraction:

references/native-and-artifacts.md

• ASARs, extracted JavaScript, feature tracing, and version comparison:

references/javascript-applications.md

• Passive browser/Electron observation and static/runtime reconciliation:

references/runtime-observation.md

• Evidence paging, comparisons, residual unknowns, and verification:

references/evidence-workflows.md

• Controlled JavaScript replay:

references/controlled-replay.md

Readiness and setup

If REA tools are available, use them directly; do not run doctor on every

task. If the MCP server is unavailable or registration is reported stale, run

npx -y rea-agents@latest doctor. Propose

npx -y rea-agents@latest setup only when doctor identifies an alignment or

provider problem. Show the exact plan and obtain approval before setup writes

configuration or installs Hopper. Restart the agent after MCP registration

changes; direct CLI commands remain available immediately.

Finish the task

Explain findings in plain language and tie them to returned evidence. When the

user asks to build something, use normal coding tools and separate observed

behavior from design choices. Close an opened native session with

close_binary when the investigation is complete.