Borrowing it
Nothing to install: this file belongs to htest-dev/htest. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/htest-dev/htest/main/CLAUDE.mdgit clone --depth 1 https://github.com/htest-dev/htestWrote 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.
[](https://agentmods.dev/instructions/htest-dev/htest/claude-md)<a href="https://agentmods.dev/instructions/htest-dev/htest/claude-md"><img src="https://agentmods.dev/badge/instructions/htest-dev/htest/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.
<a href="https://agentmods.dev/instructions/htest-dev/htest/claude-md"><img src="https://agentmods.dev/badge/instructions/htest-dev/htest/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.01222 | $0.01222 |
| Opus 5.5 | $0.00489 | $0.00489 |
| Sonnet 5.5 | $0.00244 | $0.00244 |
| Haiku 4.5 | $0.00122 | $0.00122 |
Grade A, and why
htest 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 24d 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.
How it starts
The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.
hTest
Declarative JS testing framework. Two modes: JS-first (logic, Node/browser, CI) and HTML-first (UI, browser only).
Package: htest.dev | Repo: https://github.com/htest-dev/htest | Site: https://htest.dev
Commands
| Command | Purpose |
|---|---|
npm test |
Run full test suite (self-hosted — hTest tests itself) |
npx htest tests/check.js |
Run a single test file |
npm run eslint |
Lint |
npm run eslint:fix |
Lint and auto-fix |
npm run build |
TypeDoc (API docs) + Eleventy (docs site) |
npm run dev |
Eleventy dev server for docs site |
npm run release |
Publish via release-it |
No Prettier, no EditorConfig — ESLint only (eslint.config.js).
Architecture
src/
index.js Main exports: Test, TestResult, map, check, render, env
cli.js CLI entry: arg parsing, calls run()
run.js Environment-agnostic runner: resolves env, creates Test + TestResult
check.js Assertion library: equals, subset, proximity, deep, range, and/or
config.js Config file discovery, loading, and setup script processing
map.js Value extraction utilities (extract, extractNumbers, trimmed)
format-console.js ANSI formatting with custom HTML-like tag syntax
render.js Browser-side: renders JS-first tests as HTML reftest tables
hooks.js Generic extensibility hooks singleton
content.js DEPRECATED — re-exports equals from check.js with warning
util.js General utilities (stringify, getType, interceptConsole, etc.)
objects.js Object utilities (children, walk, clone, join)
interactive-tree.js Interactive CLI: ASCII tree rendering, keyboard nav, viewport scrolling
classes/
Test.js Test tree: property inheritance, structure, auto-naming
TestResult.js Execution, evaluation, output formatting, event-driven stats
BubblingEventTarget.js EventTarget subclass with bubbling support
ThrownValue.js Wraps a thrown primitive so it can be handled like an Error (asError)
env/
node.js Node env: file resolution, --watch orchestration, CI mode
console.js Browser console env (console.group output)
auto.js Auto-detects Node vs browser
util/
format-diff.js ANSI-colored diff output for failed assertions
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.
- 24d ago Changed · +1 lines · +23 tokens per session f98b99d5fff8
- 2mo ago First seen · 103 lines · 1,199 tokens per session scan A caf5a9808547
htest CLAUDE.md is an instructions file published in the GitHub repository htest-dev/htest (23 stars, last pushed 25d ago), licensed MIT. It adds 1,222 tokens to every session, about $0.0049 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.