What is claude-code-js CLAUDE.md?

Repository instructions for a TypeScript SDK that wraps the Claude Code command-line tool. They document how the project is built, tested, checked, formatted, and published.

Building with npm, running Vitest tests, checking coverage, linting, type-checking, formatting TypeScript, and preparing a package for publishing.

They give a coding agent the commands and project structure needed to work consistently in the repository.

How s-soroosh/claude-code-js configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to s-soroosh/claude-code-js. 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/s-soroosh/claude-code-js/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/s-soroosh/claude-code-js

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/s-soroosh/claude-code-js/claude-md/github.svg)](https://agentmods.dev/instructions/s-soroosh/claude-code-js/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/s-soroosh/claude-code-js/claude-md"><img src="https://agentmods.dev/badge/instructions/s-soroosh/claude-code-js/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/s-soroosh/claude-code-js/claude-md"><img src="https://agentmods.dev/badge/instructions/s-soroosh/claude-code-js/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 601 This file is loaded in full into every session.

When invoked 601 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.

Model	Per session	Once invoked
Fable 5.1	$0.00601	$0.00601
Opus 5.5	$0.00240	$0.00240
Sonnet 5.5	$0.00120	$0.00120
Haiku 4.5	$0.00060	$0.00060

Measured 2mo ago against content hash 9425ac623bf1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

claude-code-js 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 · 66 lines

How it starts

The opening of the file, as written. The whole thing — 66 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.

Common Development Commands

Build and Development

npm run build - Build the TypeScript project to dist/
npm run dev - Watch mode for development (rebuilds on file changes)
npm run clean - Remove the dist/ directory

Testing

npm test - Run all tests using Vitest
npm test -- tests/claude-code.test.ts - Run a specific test file
npm test -- --coverage - Run tests with coverage report

Code Quality

npm run lint - Run ESLint on all TypeScript files
npm run typecheck - Run TypeScript type checking without emitting files
npm run format - Format code using Prettier

Publishing

npm run prepublishOnly - Automatically runs clean and build before publishing

Architecture Overview

This is a TypeScript SDK wrapper for the claude-code CLI. The architecture follows a clean separation of concerns:

Core Components

ClaudeCode Class (src/claude-code.ts): Main entry point that wraps the claude CLI
- Handles command construction with proper JSON output format
- Manages API key, model, and working directory options
- Provides methods: chat(), newSession(), version()
- Uses execa for process execution
Session Class (src/session.ts): Manages multi-turn conversations
- Tracks session IDs and message history
- Maintains conversation context across multiple prompts
- Automatically resumes the last session ID when continuing conversations
Command Utilities (src/commands.ts): Low-level process execution
- executeCommand() - Executes commands and returns full output
- streamCommand() - Provides real-time streaming of command output
- Both use execa under the hood for robust process management
Type Definitions (src/types.ts): TypeScript interfaces for type safety
- Defines all request/response shapes
- Provides proper typing for options, messages, and errors

Read the full file on GitHub · 66 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.

2mo ago First seen · 66 lines · 601 tokens per session scan A 9425ac623bf1

Subscribe to this mod's changes

claude-code-js CLAUDE.md is an instructions file published in the GitHub repository s-soroosh/claude-code-js (55 stars, last pushed 1y ago), licensed MIT. It adds 601 tokens to every session, about $0.0024 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.

claude-code-js CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
claude-code-js CLAUDE.mds-soroosh/claude-code-js	Instructions file	55	1y ago	MIT	A	601	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

claude-code-js: Instructions file for Claude Code