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 agentmods add instructions/reactunity/core/claude-mdgit clone --depth 1 https://github.com/ReactUnity/coreWhat 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 | $0.06014 | $0.06014 |
| Opus 5 | $0.03007 | $0.03007 |
| Sonnet 5 | $0.01203 | $0.01203 |
| Haiku 4.5 | $0.00601 | $0.00601 |
Grade A, and why
core 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 yesterday.
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.
How it starts
The opening of the file, as written. The whole thing — 216 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
What this repo is
ReactUnity: a React renderer that draws UI inside Unity3D (UGUI, UIToolkit, and the Unity Editor) without a DOM. This is a monorepo formed by merging ~10 previously separate ReactUnity repos (renderer, scripts, material, create, core, jint, quickjs, clearscript, docs, tests, full-sample (now kitchen-sink/), samples) with their histories preserved — see the chore: merge X into Y commits. Much of the layout only makes sense in that light, and the workflow files under .github/workflows/ carry detailed comments explaining why each piece is shaped the way it is. Read those before changing CI.
Two package universes
npm (packages/*) |
UPM / Unity (unity/*) |
|
|---|---|---|
| Members | @reactunity/renderer, scripts, material, create |
com.reactunity.core, jint, quickjs, clearscript |
| Consumed by | the user's React app | the user's Unity project |
| Published by | .github/workflows/release-npm.yml (Tegami + npm OIDC) |
.github/workflows/release-upm.yml (manual dispatch, orphan branch per package) |
All eight share one version number (currently 0.22.0). Tegami bumps packages/*; the syncUnityVersions plugin in scripts/tegami.mts copies that version into the four unity/*/package.json manifests.
unity/*/package.json files are UPM manifests, not npm manifests. Their dependencies are Unity package names (com.unity.editorcoroutines). They are deliberately excluded from the pnpm workspace — adding them would send pnpm to the npm registry looking for Unity packages.
pnpm workspace membership
Defined in pnpm-workspace.yaml, which documents every inclusion and exclusion. Members are: packages/*, unity/core/.react/* (three React apps embedded in the core Unity package; the .react dot-prefix hides them from Unity's asset importer), kitchen-sink/react, and docs.
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.
- yesterday First seen · 216 lines · 6,014 tokens per session scan A 01b94082bdd2
core CLAUDE.md is an instructions file published in the GitHub repository ReactUnity/core (893 stars, last pushed 4d ago), licensed MIT. It adds 6,014 tokens to every session, about $0.0301 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.
Other instructions, from other repositories
unity-cli-loop AGENTS.md
AGENTS.md instructions for hatayama/unity-cli-loop, covering architecture overview, repository map, cli / unity package compatibility, project runner pin and generated skill files.
unity-ui-toolkit-design-system AGENTS.md
Instructions for sinanata/unity-ui-toolkit-design-system, covering agents.md, what this project is, golden rules (do not violate), use the design system in your project and repository layout.
unity-ui-toolkit-design-system copilot-instructions.md
Instructions for sinanata/unity-ui-toolkit-design-system: This repository follows the cross-tool AGENTS.md standard. Read /AGENTS.md for the full guide: the ds- class naming, the token rules, the load-bearing USS import order, build and preview commands, and the pull-request checklist.
unity-mesh-fracture AGENTS.md
Instructions for sinanata/unity-mesh-fracture, covering agents.md, what this project is, golden rules (do not violate), wire it into your project and public api.
Aspid.FastTools CLAUDE.md
Instructions for VPDPersonal/Aspid.FastTools, covering обзор репозитория, сборка, архитектура, карта функциональности and соглашения по коду редактора.
unity-cli CLAUDE.md
Instructions for bigdra50/unity-cli, covering claude.md, project overview, commands, install globally (provides: unity-cli, u, unity commands) and run relay server standalone.