What is hackerx CLAUDE.md?

Project instructions for HackerX, a course product whose codebase is a monorepo, meaning one repository containing several related parts. They define the project’s content structure, writing style, and editing rules.

Editing HackerX course lessons, keeping the site’s copied course content up to date, preserving numbered folders, and maintaining links and project conventions.

They keep changes consistent across the course, website, and command-line tool, and prevent agents from treating the repository like a normal deployable application.

How DigitalBoutique-ai/hackerx configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to DigitalBoutique-ai/hackerx. 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/DigitalBoutique-ai/hackerx/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/DigitalBoutique-ai/hackerx

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/digitalboutique-ai/hackerx/claude-md/github.svg)](https://agentmods.dev/instructions/digitalboutique-ai/hackerx/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/digitalboutique-ai/hackerx/claude-md"><img src="https://agentmods.dev/badge/instructions/digitalboutique-ai/hackerx/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/digitalboutique-ai/hackerx/claude-md"><img src="https://agentmods.dev/badge/instructions/digitalboutique-ai/hackerx/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 737 This file is loaded in full into every session.

When invoked 737 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	$0.00737	$0.00737
Opus 5.5	$0.00295	$0.00295
Sonnet 5.5	$0.00147	$0.00147
Haiku 4.5	$0.00074	$0.00074

Measured 2mo ago against content hash 0bbadce7a060, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

hackerx 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 · 54 lines

How it starts

The opening of the file, as written. The whole thing — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.

HackerX — Project Conventions

This is the working directory for the HackerX product (formerly Vibe Coder 100x). When Claude Code is invoked here, it should behave as the course teaches — not as a generic assistant.

The product surface is hackerx.app. This monorepo contains:

Course markdown (00-start-here/ … 11-final-operating-system/, templates/) — the canonical source of truth.
site/ — the Astro Starlight site that powers hackerx.app. Reads from site/course/ (a build-time copy of the canonical content).
cli/ — the hackerx npm CLI + Claude Code plugin.
scripts/sync-course-to-site.sh — copies the canonical course modules into site/course/ after edits.

When you change course markdown at the repo root, also run scripts/sync-course-to-site.sh so the site rebuild picks up the change.

Behavior rules

This repo contains course content, not a deployable app. Do not scaffold React/Vite/Next unless explicitly asked.
All content lives in markdown. Prefer editing existing files over creating new ones.
Numbered folder prefixes (00-, 01-, ...) are intentional — preserve them so the course stays ordered.
Cross-link aggressively. Every module's README.md should link to its siblings.
When adding a new lesson, also add it to the top-level README.md course map.

Voice and tone

Punchy, second-person ("you do this, then you do that").
No corporate hedging. Direct over diplomatic.
Show prompts as code blocks so they're copy-pasteable.
Every "weak prompt" should have a "better prompt" right next to it.
No emojis unless explicitly requested.

Structure rules for lessons

Every lesson should answer:

What's the problem this solves? (one sentence)
What's the pattern / prompt / vocabulary? (the actual content)
When do you use it? (decision criteria)
What's a weak vs. better prompt? (concrete example)
What does Claude Code verify? (typecheck, lint, responsive, a11y, screenshot)

Read the full file on GitHub · 54 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 · 54 lines · 737 tokens per session scan A 0bbadce7a060

Subscribe to this mod's changes

hackerx CLAUDE.md is an instructions file published in the GitHub repository DigitalBoutique-ai/hackerx (5 stars, last pushed 3mo ago), licensed MIT. It adds 737 tokens to every session, about $0.0029 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 2026-08-31.

hackerx CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
hackerx CLAUDE.mdDigitalBoutique-ai/hackerx	Instructions file	5	3mo ago	MIT	A	737	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

hackerx: Instructions file for Claude Code