What is agent-skills-vrc-udon CLAUDE.md?

A set of instructions for developing and maintaining an AI-skills package for VRChat UdonSharp, the programming language used to script VRChat worlds. It covers the package's files, workflow, documentation, and checks.

Adding or updating VRChat UdonSharp knowledge files, templates, SDK-related guidance, documentation, and repository maintenance workflows.

It explains how to work on this specific repository without treating it like a complete VRChat or Unity game project. It also separates files meant for users from tools meant only for maintainers.

How niaka3dayo/agent-skills-vrc-udon configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to niaka3dayo/agent-skills-vrc-udon. 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/niaka3dayo/agent-skills-vrc-udon/dev/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/niaka3dayo/agent-skills-vrc-udon

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/niaka3dayo/agent-skills-vrc-udon/claude-md/github.svg)](https://agentmods.dev/instructions/niaka3dayo/agent-skills-vrc-udon/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/niaka3dayo/agent-skills-vrc-udon/claude-md"><img src="https://agentmods.dev/badge/instructions/niaka3dayo/agent-skills-vrc-udon/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/niaka3dayo/agent-skills-vrc-udon/claude-md"><img src="https://agentmods.dev/badge/instructions/niaka3dayo/agent-skills-vrc-udon/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 3,415 This file is loaded in full into every session.

When invoked 3,415 The same file — it is already loaded in full.

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.

Model	Per session	Once invoked
Fable 5.1	$0.03415	$0.03415
Opus 5	$0.01707	$0.01707
Sonnet 5	$0.00683	$0.00683
Haiku 4.5	$0.00342	$0.00342

Measured 13d ago against content hash cdf4562dc64c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

agent-skills-vrc-udon CLAUDE.md 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 13d 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.md · 297 lines

How it starts

The opening of the file, as written. The whole thing — 297 lines — stays where its author put it; the contents beside it link to each section on GitHub.

agent-skills-vrc-udon Development Guide

This repository is an npm package that distributes AI agent skills for VRChat UdonSharp development. It is NOT a VRChat/Unity project. The codebase consists of markdown knowledge files, templates, and CI workflows.

Repository Structure

skills/                          # Skill content (distributed to users)
  unity-vrc-udon-sharp/          # UdonSharp constraints, networking, templates
  unity-vrc-world-sdk-3/         # World SDK components, optimization
.claude/
  rules/
    doc-sync.md                  # Documentation sync rule (repo maintenance)
  hooks/
    doc-sync-reminder.sh         # PostToolUse hook: reminds about doc updates
  skills/
    unity-vrc-skills-renovator/  # Meta-skill for maintaining skills (dev only, not distributed)
  audit/                         # SDK coverage-audit tooling + ledger (maintainer-only, not distributed)
    README.md                    # How to run the SDK-bump diff audit
    sdk-coverage-ledger.md       # Decision ledger (candidates, verdicts, skips)
    scripts/                     # census / diff / refine pipeline
templates/                       # AI tool config templates (distributed to users)
  CLAUDE.md                      # Claude Code project instructions
  AGENTS.md                      # Codex CLI / generic agent instructions
  GEMINI.md                      # Gemini CLI instructions
.github/
  workflows/                     # CI (lint, pack test, publish)
  ISSUE_TEMPLATE/                # Bug report, knowledge request
package.json                     # npm package config

Development Workflow

feature/* ──PR──> dev ──release PR──> main ──tag──> npm publish

Default branch: dev (integration)
Release branch: main (triggers npm publish via GitHub Release)
All PRs must target dev (never main directly)
main is updated only via release PRs from dev

Branch Protection

Both dev and main are protected:

No direct push (enforce_admins: true, applies to admin too)
All seven CI checks are required: Symlink Integrity, Hook Scripts, Documentation Smoke Tests, Markdown Links, npm Pack Test, EditorConfig, and Version Sync
Required checks use strict: false on dev and strict: true on main
PR required for all changes

Read the full file on GitHub · 297 lines

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.

13d ago First seen · 297 lines · 3,415 tokens per session scan A cdf4562dc64c

Subscribe to this mod's changes

agent-skills-vrc-udon CLAUDE.md is an instructions file published in the GitHub repository niaka3dayo/agent-skills-vrc-udon (299 stars, last pushed 7d ago), licensed MIT. It adds 3,415 tokens to every session, about $0.0171 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.

Claude Code Game development ai-agent codex-cli gemini-cli udonsharp vrc-sdk

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agent-skills-vrc-udon: Instructions file for Claude Code