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node-sfu: Instructions file for Claude Code

CLAUDE.md

node-sfu CLAUDE.md is an instructions file for Claude Code from shinyoshiaki/node-sfu. It costs 1,423 tokens per session, scanned A, original, MIT.

Repository instructions for node-sfu, a TypeScript WebRTC video-conferencing system. WebRTC is the browser technology used for real-time audio and video, and an SFU forwards each participant's media to others.

In plain words
What is it for?
Use them when developing or testing the server, browser client, reference API, or end-to-end tests.
Why use it?
They explain the project's structure, requirements, dependencies, and package-specific rules before code changes are made.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is shinyoshiaki/node-sfu's own configuration. It tells Claude Code how to work on node-sfu itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything node-sfu configures →

not rated 83repo 1y ago A scan 1,423 tokens original MIT
View source ↗ shinyoshiaki/node-sfu
Reuse

Borrowing it

Nothing to install: this file belongs to shinyoshiaki/node-sfu. 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/shinyoshiaki/node-sfu/v2/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/shinyoshiaki/node-sfu

Made for: Claude Code.

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Per session 1,423 This file is loaded in full into every session.
When invoked 1,423 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01423 $0.01423
Opus 5.5 $0.00569 $0.00569
Sonnet 5.5 $0.00285 $0.00285
Haiku 4.5 $0.00142 $0.00142

Measured 2mo ago against content hash e63d79e47940, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

node-sfu 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 2mo 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 · 137 lines

How it starts

The opening of the file, as written. The whole thing — 137 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.

Project Overview

This is node-sfu, a Pure Node.js WebRTC SFU (Selective Forwarding Unit) 100% written in TypeScript. The project implements a complete WebRTC-based video conferencing solution with room-based architecture for managing multi-party sessions. Features include real-time video conferencing, comprehensive media publication/subscription management, and structured JSON-RPC communication protocols.

Requirements:

  • Node.js 18 or higher
  • ES modules ("type": "module")

Core Dependencies:

  • werift WebRTC library (via git submodule) - Pure TypeScript WebRTC implementation
  • Express.js for REST API server
  • React + Vite for conference application
  • Vitest + Playwright for testing

Package-Specific Guidance

Each package has its own CLAUDE.md file with detailed guidance:

  • packages/core/CLAUDE.md - Core SFU logic and server-side implementation
  • packages/client/CLAUDE.md - Browser-side WebRTC client implementation
  • packages/reference-server/CLAUDE.md - Express.js server and REST API endpoints
  • packages/e2e/CLAUDE.md - End-to-end testing framework and guidelines
  • packages/conference/CLAUDE.md - React conference application development
  • packages/json-rpc/CLAUDE.md - JSON-RPC communication protocol implementation
  • packages/utils/CLAUDE.md - Shared utilities for cross-platform compatibility

Workspace Structure

  • packages/core/ - Core SFU logic with Room, Member, publication/subscription management
  • packages/client/ - Client-side WebRTC implementation with data and media channel support
  • packages/reference-server/ - Express.js server with room management and signaling endpoints
  • packages/e2e/ - End-to-end testing infrastructure using Vitest browser mode
  • packages/conference/ - React-based conference application with WebRTC UI, real-time video conferencing
  • packages/json-rpc/ - JSON-RPC protocol implementation for structured communication
  • packages/utils/ - Shared utilities and helper functions for cross-platform compatibility
  • submodules/werift/ - WebRTC protocol implementation in TypeScript

Read the full file on GitHub · 137 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. 2mo ago First seen · 137 lines · 1,423 tokens per session scan A e63d79e47940

Subscribe to this mod's changes

node-sfu CLAUDE.md is an instructions file published in the GitHub repository shinyoshiaki/node-sfu (83 stars, last pushed 1y ago), licensed MIT. It adds 1,423 tokens to every session, about $0.0057 per session on Opus 5.5. 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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