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.
npx skills add hypnguyen1209/offensive-claude --skill coding-masterygit clone --depth 1 https://github.com/hypnguyen1209/offensive-claudeWrote 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.
[](https://agentmods.dev/skills/hypnguyen1209/offensive-claude/coding-mastery)<a href="https://agentmods.dev/skills/hypnguyen1209/offensive-claude/coding-mastery"><img src="https://agentmods.dev/badge/skills/hypnguyen1209/offensive-claude/coding-mastery.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high YARA Match · line 33 YARA rule matched a hack tool or exploit indicator (offensive tools, reconnaissance, privilege escalation, or exploit frameworks).Fix: Remove offensive tool references and exploit code. Legitimate agent skills should not contain penetration testing tools, exploit frameworks, or reconnaissance utilities.
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 | $0.00037 | $0.03783 |
| Opus 5 | $0.00018 | $0.01892 |
| Sonnet 5 | $0.00007 | $0.00757 |
| Haiku 4.5 | $0.00004 | $0.00378 |
Grade A, and why
coding-mastery scanned grade A with 1 finding 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 7d 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
proc = subprocess.run( How it starts
The opening of the file, as written. The whole thing — 541 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Coding Mastery
When to Activate
- Writing exploit code, PoCs, or security tools
- Developing automation scripts for pentesting workflows
- Implementing network protocols or custom C2
- Building security analysis tools
- Cryptographic implementation or analysis
- Performance-critical systems programming
Languages & Use Cases
Python (Primary — Offensive Tooling)
# Exploit development with pwntools
from pwn import *
context(arch='amd64', os='linux')
# Network programming
import socket, ssl, struct
import asyncio, aiohttp # async operations
# Web exploitation
import requests, urllib3
from bs4 import BeautifulSoup
# Crypto
from Crypto.Cipher import AES, DES
from Crypto.PublicKey import RSA
import hashlib, hmac
# Binary analysis
import struct, ctypes
from capstone import * # disassembly
from unicorn import * # emulation
from keystone import * # assembly
C/C++ (Systems & Exploit Dev)
// Shellcode development
// Position-independent code, null-free
// Syscall-based (avoid libc dependency)
// Kernel module development
#include <linux/module.h>
#include <linux/kernel.h>
// Windows API abuse
#include <windows.h>
#include <winternl.h>
// Direct syscalls, NTAPI
// Memory manipulation
// Custom allocators, heap spray, ROP gadget finders
Go (Offensive Tooling & C2)
// Implant development (cross-compile, static binary)
// C2 communication (HTTP/DNS/named pipes)
// Network scanning and enumeration
// Proxy/tunnel tools (chisel-like)
// Advantages: single binary, cross-platform, fast, good crypto stdlib
Rust (High-Performance Security Tools)
// Memory-safe exploit tooling
// High-performance scanners
// Custom protocol implementations
// Fuzzing harnesses
PowerShell (Windows Post-Exploitation)
# AMSI bypass, ETW patching
# In-memory execution (reflection)
# AD enumeration and exploitation
# Fileless malware techniques
Assembly (x86/x64/ARM)
; Shellcode
; ROP gadgets
; Anti-debugging
; Kernel exploitation
; Architecture-specific tricks
What ships with it
10 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.
- scripts/_lib/action_guard.py 13 KB runs code
- scripts/_lib/cmd_parser.py 11 KB runs code
- scripts/_lib/http_creds.py 2.9 KB runs code
- scripts/_lib/private_tag.py 3.9 KB runs code
- scripts/_lib/redact_headers.py 5.1 KB runs code
- scripts/_lib/safe_subprocess.py 19 KB runs code
- scripts/_lib/scope_guard.py 12 KB runs code
- scripts/_lib/secret_scan.py 5.7 KB runs code
- scripts/_lib/unicode_scan.py 4.3 KB runs code
- scripts/lib.sh 2.0 KB runs code
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.
- 7d ago First seen · 541 lines · 37 tokens per session scan A 0b237f743098
coding-mastery is a skill published in the GitHub repository hypnguyen1209/offensive-claude (357 stars, last pushed 21d ago), licensed MIT. It adds 37 tokens to every session and 3,783 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
bt6-queue-audit
Audit the full pull-request and issue queue of a BT6 research or support repository, classifying readiness, evidence risk, and next action without mutating tracker state.
bt6-issue-steward
Triage and steward issues in BT6 research and support repositories, deciding whether to answer, reproduce, correct evidence, link work, design a feature, route security, implement, or close.
bt6-merge-train
Run an explicitly authorized, conservative BT6 merge train that processes validated pull requests one at a time and reconciles repository, CI, evidence, and issue state after each merge.
bt6-pr-audit
Audit one pull request in a BT6 research or support repository at an exact head SHA, covering correctness, research integrity, security, tests, contracts, and merge readiness.
bt6-provider-review
Audit an external AI/API provider and its integration into a BT6 repository for service reality, independent verification, trust boundaries, secret handling, API/model correctness, completeness, claim traceability, and merge readiness.
xiaohongshu-search-full
Search Xiaohongshu (XHS / RedNote) notes by keyword with full field extraction including body text, topics/tags, image list URLs, video stream URL, publish timestamp, and all engagement stats (likes, collects, comments, shares). Supports all page filter options: sort order (general, latest, most liked, most commented…