What is macho-analyze?

A read-only inspector for Mach-O files, the executable format used by macOS and iOS programs. It reports architecture, file type, linked libraries, search paths, signing, and encryption without running the file.

Use it to examine executables, dynamic libraries, app bundles, and kernel extensions; check whether they are signed, encrypted, position-independent, or linked to notable libraries.

It gives you a quick structural view of an unfamiliar or suspicious Apple-platform binary without executing potentially unsafe code.

macho-analyze — Skill for Claude Code and Codex by batteryshark: A read-only inspector for Mach-O files, the executable format…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/batteryshark/rekit/macho-analyze

Any agent

npx skills add batteryshark/rekit --skill macho-analyze

Clone the repo

git clone --depth 1 https://github.com/batteryshark/rekit

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/batteryshark/rekit/macho-analyze.svg)](https://agentmods.dev/skills/batteryshark/rekit/macho-analyze)

Your own site

<a href="https://agentmods.dev/skills/batteryshark/rekit/macho-analyze"><img src="https://agentmods.dev/badge/skills/batteryshark/rekit/macho-analyze.svg" alt="Measured on agentmods" height="20"></a>

Per session 80 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 551 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00080	$0.00551
Opus 5	$0.00040	$0.00275
Sonnet 5	$0.00016	$0.00110
Haiku 4.5	$0.00008	$0.00055

Measured 5d ago against content hash 23083393b1aa, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

macho-analyze scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/analyze.py, scripts/build.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/macho-analyze/SKILL.md · 50 lines

What it actually says

Mach-O Binary Analyzer

Static triage of Mach-O binaries (macOS/iOS executables, .dylib, bundles, kexts) with macholib.

When to use

You have a macOS/iOS binary and want a fast read on what it is and whether it looks suspicious — without running it. This completes the PE/ELF/Mach-O triage trio and emits BINARY.* atoms for downstream analysis.

What it reports

Per architecture slice (Mach-O can be fat/universal):

Header — CPU/arch, file type (EXECUTE/DYLIB/BUNDLE/KEXT…), PIE (BINARY.NO_PIE).
Linked dylibs — every LC_LOAD_DYLIB, classified for network/crypto frameworks (BINARY.INTERESTING_LINK).
RPATH — LC_RPATH entries (@rpath dylib-hijack surface) → BINARY.RPATH.
Signature — LC_CODE_SIGNATURE presence → BINARY.NO_SIGNATURE when absent.
Encryption — LC_ENCRYPTION_INFO with cryptid set (protector/DRM, the Mach-O packing tell) → BINARY.ENCRYPTED.

Strictly static — parses load commands via macholib and never loads, maps, or executes the binary. Safe on hostile files.

Usage

rekit run macho-analyze ./suspicious.dylib
rekit run macho-analyze /path/to/app.app/Contents/MacOS/app --format json

Non-Mach-O input fails honestly ({"ok": false, "error": "not a valid Mach-O: …"}).

Prerequisites

python3 ≥ 3.8 — macholib is installed under scripts/site (pure-python), so no network/install at analysis time.

Rebuilding

scripts/site is populated from the pinned scripts/requirements.txt by scripts/build.sh (uv pip install --target, build time only).

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

5d ago First seen · 50 lines · 80 tokens per session scan A 23083393b1aa

Subscribe to this mod's changes

macho-analyze is a skill published in the GitHub repository batteryshark/rekit (10 stars, last pushed 27d ago), licensed Apache-2.0. It adds 80 tokens to every session and 551 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Security

systematic-debugging

Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.

obra/superpowers · 21 tokens

local-ai-agents

Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…

microsoft/ai-agents-for-beginners · 200 tokens

next-cache-components-adoption

Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…

vercel/next.js · 95 tokens

next-cache-components-optimizer

Drive a Next.js route to instant navigation by setting up an agentic loop, under Cache Components / PPR, on initial load (hard navigation) and client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route at a time; the shipped test then…

vercel/next.js · 170 tokens

next-partial-prefetching-adoption

Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the partialPrefetching flag, opt routes in with export const prefetch = 'partial', audit Link prefetch={true} behavior, preserve existing prefetched UI with…

vercel/next.js · 103 tokens

chronicle

Analyze Copilot session history for standup reports, usage tips, session search, and session reindexing. Use when the user asks for a standup, daily summary, usage tips, workflow recommendations, wants to search or find past sessions by keyword/file/PR, wants to reindex their session store, or asks about deleting…

microsoft/vscode · 72 tokens