unity-il2cpp

A reverse-engineering skill for recovering C# program structure from Unity games compiled with IL2CPP, a Unity technology that converts C# into native code.

In plain words
What is it for?
Use it to analyze IL2CPP-compiled Unity game binaries and reconstruct their C# types and relationships.
Why use it?
It helps inspect game code when the original C# source is not directly available in the compiled game.

Skill for Claude CodeCodex

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/mineroma/nekocode/unity-il2cpp
Any agent
npx skills add MineRoma/nekocode --skill unity-il2cpp
Clone the repo
git clone --depth 1 https://github.com/MineRoma/nekocode

Made for: Claude Code, Codex.

Per session 4 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 712 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00004 $0.00712
Opus 5 $0.00002 $0.00356
Sonnet 5 $0.00001 $0.00142
Haiku 4.5 $0.00000 $0.00071

Measured 2d ago against content hash 70872c7f1b6a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

unity-il2cpp 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 2d 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.

internal/skills/bundled/reverse/unity-il2cpp/SKILL.md · 51 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 2d ago First seen · 51 lines · 4 tokens per session scan A 70872c7f1b6a

Subscribe to this mod's changes

unity-il2cpp is a skill published in the GitHub repository MineRoma/nekocode (5 stars, last pushed 12d ago), licensed GPL-3.0. It adds 4 tokens to every session and 712 once invoked, about $0.0000 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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