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twd: Instructions file for Claude Code

CLAUDE.md

twd CLAUDE.md is an instructions file for Claude Code from BRIKEV/twd. It costs 1,846 tokens per session, scanned A, original, MIT.

An in-browser testing library that runs tests inside a web page and shows results in a sidebar. It is intended for single-page apps with predictable, client-side interfaces, not mainly server-rendered apps.

In plain words
What is it for?
It helps select page elements, check expected behavior, simulate user actions, mock parts of an app, and test navigation.
Why use it?
It provides immediate visual feedback while testing browser interactions, so developers can see test results alongside the interface.

Instructions file for Claude Code

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

This is BRIKEV/twd's own configuration. It tells Claude Code how to work on twd 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 twd configures →

not rated 68repo changed today A scan 1,846 tokens original MIT
View source ↗ BRIKEV/twd twd.dev
Reuse

Borrowing it

Nothing to install: this file belongs to BRIKEV/twd. 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/BRIKEV/twd/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/BRIKEV/twd

Made for: Claude Code.

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Per session 1,846 This file is loaded in full into every session.
When invoked 1,846 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 $0.01846 $0.01846
Opus 5.5 $0.00738 $0.00738
Sonnet 5.5 $0.00369 $0.00369
Haiku 4.5 $0.00185 $0.00185

Measured today against content hash 2d03e69f4164, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

twd 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 · 159 lines

How it starts

The opening of the file, as written. The whole thing — 159 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

TWD (Test While Developing) is an in-browser testing library that runs tests directly in the browser with a sidebar UI for instant visual feedback. It's designed for SPAs with deterministic, client-side UI testing - not suitable for SSR-first architectures (Next.js App Router, server-side features).

Common Commands

# Development
npm run dev                    # Vite dev server

# Build (outputs to dist/)
npm run build                  # Full build: vite + service worker + bundle

# Testing with Vitest
npm test                       # Run tests in watch mode
npm run test:ci                # Run tests with coverage (CI mode)
npm test src/tests/ui/twdSidebar.spec.tsx  # Run specific test file

# Documentation (VitePress)
npm run docs:dev               # Dev documentation server
npm run docs:build             # Build documentation

Architecture

Entry Points

  • src/index.ts - Main public API exporting twd, expect, userEvent, screenDom
  • src/twd.ts - Core TWD API (element selection, assertions, mocking, navigation)
  • src/runner.ts - Test execution engine (describe, it, beforeEach, afterEach)
  • src/bundled.tsx - Preact-based bundled version for framework-agnostic use (Vue, Angular, Solid)
  • src/runner-ci.ts - CI/headless execution with results reporting
  • src/vite-plugin.ts - Vite plugin utilities for HMR and mock service worker

Key Modules

  • src/asserts/ - Assertion implementations (have.text, be.visible, have.class, etc.)
  • src/commands/ - Test commands (mockBridge.ts for request mocking via service worker, visit.ts for navigation)
  • src/ui/ - Preact components for the sidebar UI (TWDSidebar.tsx, TestList.tsx)
  • src/proxies/ - Wrappers for @testing-library/user-event and @testing-library/dom
  • src/initializers/ - Test and sidebar initialization logic
  • src/cli/ - CLI tool for service worker installation (npx twd-js init public)

Read the full file on GitHub · 159 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 · +13 lines · +135 tokens per session 2d03e69f4164
  2. 16d ago Changed b1c99969ac80
  3. 1mo ago Changed · +20 lines · +286 tokens per session 75298088275b
  4. 1mo ago Changed · +13 lines · +148 tokens per session 36e2239dd5f5
  5. 2mo ago First seen · 113 lines · 1,277 tokens per session scan A fc4674fcb282

Subscribe to this mod's changes

twd CLAUDE.md is an instructions file published in the GitHub repository BRIKEV/twd (68 stars, last pushed today), licensed MIT. It adds 1,846 tokens to every session, about $0.0074 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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