Mobix: Skill for Claude Code

.claude/skills/mobile-pentest/SKILL.md

mobile-pentest is a skill for Claude Code from blackfoxxx/Mobix. It costs 123 tokens per session (2,624 once invoked), scanned A, original, MIT.

A security-testing method for Android apps in Mobix engagements, using a rooted MuMu emulator. It covers examining app traffic, code, sessions, stored data, and communication between app components.

In plain words
What is it for?
Use it to test Android apps for issues such as IDOR/BOLA, token and JWT handling errors, unsafe local storage, and weaknesses in app communication.
Why use it?
It gives testers a focused process for turning suspicious behavior into evidence-backed findings, including access-control and session problems.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: mentions Claude Code.

This is blackfoxxx/Mobix's own configuration. It tells Claude Code how to work on Mobix itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything Mobix configures →

Reuse

Borrowing it

Nothing to install: this file belongs to blackfoxxx/Mobix. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/blackfoxxx/Mobix/master/.claude/skills/mobile-pentest/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/blackfoxxx/Mobix

Made for: Claude Code.

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.

agentmods badge for mobile-pentest

README.md
[![agentmods](https://agentmods.dev/badge/skills/blackfoxxx/mobix/mobile-pentest/github.svg)](https://agentmods.dev/skills/blackfoxxx/mobix/mobile-pentest)
Your own site
<a href="https://agentmods.dev/skills/blackfoxxx/mobix/mobile-pentest"><img src="https://agentmods.dev/badge/skills/blackfoxxx/mobix/mobile-pentest/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for mobile-pentest

Your own site · 80×15
<a href="https://agentmods.dev/skills/blackfoxxx/mobix/mobile-pentest"><img src="https://agentmods.dev/badge/skills/blackfoxxx/mobix/mobile-pentest.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 123 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,624 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00123 $0.02624
Opus 5 $0.00062 $0.01312
Sonnet 5 $0.00025 $0.00525
Haiku 4.5 $0.00012 $0.00262

Measured 8d ago against content hash 49d93a721f4e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

mobile-pentest 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 8d ago.

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.

.claude/skills/mobile-pentest/SKILL.md · 222 lines

How it starts

The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mobile app pentest methodology (Mobix)

This is Mobix's own pentest methodology, shipped with the repo so any mp engage session, on any machine, starts smart rather than generic. It is scoped to what this lab actually does: Android only, against the rooted MuMu emulator described in the main README. Don't reach for iOS guidance, jailbreak tooling, or a physical device farm. None of that exists here.

Orient yourself first

Before doing anything else, work out two things: what's already been done for you, and what mode you're running in.

  1. Read the ranked pass that's already done. Call traffic_brief (or read ./BRIEF.md if it's on disk). This ranks every endpoint by risk with reasoning attached and already splits out broken-access-control, IDOR/BOLA, and mass-assignment candidates. Your job is the layer underneath that: cross-flow correlation, business-logic reasoning, and turning candidates into confirmable, evidenced findings. Don't just restate the brief.
  2. Check which mode you're in. Try listing your available tools, or just attempt lab_status.
    • If you have target_*, bypass_*, creds_*, and Bash: you're in an interactive session (or a hand-started one). Everything in this skill applies.
    • If you only have traffic_status, traffic_sessions, traffic_flows, traffic_flow, traffic_search, traffic_brief, plus Read/Write/ Grep/Skill: you're the --auto agent. No Bash, no other MCP tools, no request sending, by design. Only the traffic-analysis parts of this skill apply to you. Sections marked (interactive only) below are not available to you. Don't try to work around that; it's the deliberate safety boundary for unattended runs. Write up what you can determine from traffic alone, and note in the finding what a follow-up interactive session would need to confirm.

Workflow

Work through these in order. Skip a step outright if nothing in scope touches it, don't force a finding.

Read the full file on GitHub · 222 lines

Files

What ships with it

7 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.

  1. 8d ago First seen · 222 lines · 123 tokens per session scan A 49d93a721f4e

Subscribe to this mod's changes

mobile-pentest is a skill published in the GitHub repository blackfoxxx/Mobix (4 stars, last pushed 25d ago), licensed MIT. It adds 123 tokens to every session and 2,624 once invoked, about $0.0006 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 2026-08-31.

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