WebScreen CLAUDE.md

WebScreen CLAUDE.md is an instructions file for coding agents from noricha-vr/WebScreen. It costs 1,706 tokens per session, scanned A, original, MIT.

A repository guide for WebScreen, a service that turns web pages, images, and PDFs into MP4 videos that can play in VRChat. It explains which part of the codebase is current and how it is organized.

In plain words
What is it for?
Use it when developing or fixing WebScreen, especially features in the web/ directory, its API contracts, browser-based conversion, storage, authentication, and translated interface text.
Why use it?
It prevents agents from changing the retired system instead of the current web application.

Instructions file

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 instructions/noricha-vr/webscreen/claude-md
Clone the repo
git clone --depth 1 https://github.com/noricha-vr/WebScreen

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 WebScreen CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/noricha-vr/webscreen/claude-md.svg)](https://agentmods.dev/instructions/noricha-vr/webscreen/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/noricha-vr/webscreen/claude-md"><img src="https://agentmods.dev/badge/instructions/noricha-vr/webscreen/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 1,706 This file is loaded in full into every session.
When invoked 1,706 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.01706 $0.01706
Opus 5 $0.00853 $0.00853
Sonnet 5 $0.00341 $0.00341
Haiku 4.5 $0.00171 $0.00171

Measured today against content hash 35d57c373c8e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

WebScreen 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 today.

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 · 92 lines

How it starts

The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Claude Code がこのリポジトリで作業するときの地図。詳細は各リンク先を正本とし、ここには判断に効く情報だけ置く。

このリポジトリは 2 系統が同居している

系統 実体 状態
現行(ここを触る) web/ — Astro + Cloudflare Workers + D1 + R2 本番 https://web-screen.net
旧(触らない) リポジトリ直下の router/ movie_maker/ templates/ static/ api/ 等 — FastAPI + Selenium + GCS 廃止予定。Cloud Run で古いリビジョンが稼働したままだが新規開発しない

<critical_rule> 新しい機能・修正は web/ に入れる。 旧系統のファイルは、明示的に「旧版を直して」と指示された時以外は編集しない。 Dockerfile / docker-compose.yaml / cloudbuild.yaml / requirements.txt も旧系統専用(Cloud Build のトリガーは無効化済み)。 </critical_rule>

関連サービスは別リポにある: web-capture(Cloud Run。URL のスクリーンショットを撮って R2 へ置く)。

何をするプロダクトか

Web ページ・画像・PDF を、VRChat のビデオプレイヤーで再生できる MP4 に変換して配る。 変換した動画は公開 URL を持ち、VRChat に貼るだけで再生できる。

web/ の構成

パス 役割
web/src/pages/ エントリポイント(api/ は Worker の API、[shortId]/ はプレビューとダウンロード)
web/src/lib/contracts/ API の契約の正本api.ts が producer(Worker)と consumer(ブラウザ・web-capture)の共通定義
web/src/lib/services/ ドメインロジック(D1 / R2 の操作、認証、保持期間)
web/src/lib/convert/ ブラウザ内変換(PDF.js / FFmpeg.wasm)
web/src/lib/ui/ 画面の配線(DOM 操作と状態遷移)
web/src/i18n/ 表示文言の正本(ja / en)。テンプレートや JS に文言を直書きしない
web/cron/ 保持期間バッチ(別 Worker。同じ D1 / R2 を共有する)
web/migrations/ D1 のマイグレーション

開発

make install         # 初回のみ(web/ の依存を lockfile 固定で入れる)
make help
make check
make e2e
make stream-probe ID=AbCdEf123456

web/.dev.vars にローカル用の環境変数が要る(.dev.vars.example を参照)。

  • ローカル環境・E2E の落とし穴(dev サーバー復旧・ポート分離・Claude Code サンドボックス)は docs/local-dev.md

デプロイ

main への push で GitHub Actions が本番へ反映する(.github/workflows/deploy.yml)。 型チェック → ユニットテスト → ビルド → D1 マイグレーション → Worker 2 つ → 疎通確認、の順で、失敗したら自動でロールバックする。

<critical_rule> wrangler rollback は Worker のコードしか戻さない。 D1 / R2 のデータも cron スケジュールも戻らない。 そのため D1 の変更は必ず後方互換にする(破壊的変更は「追加 → 切替 → 削除」の 3 段階に分ける)。 </critical_rule>

判断材料の詳細は playbook ノート playbook-cloudflare-workers-deploy にある(note use で読む)。

Read the full file on GitHub · 92 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.

  1. today Changed · +12 lines · +358 tokens per session 35d57c373c8e
  2. 4d ago First seen · 80 lines · 1,348 tokens per session scan A 3480effffb62

Subscribe to this mod's changes

WebScreen CLAUDE.md is an instructions file published in the GitHub repository noricha-vr/WebScreen (20 stars, last pushed today), licensed MIT. It adds 1,706 tokens to every session, about $0.0085 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.

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