Borrowing it
Nothing to install: this file belongs to itsmostafa/llm-engineering-skills. 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/itsmostafa/llm-engineering-skills/main/CLAUDE.mdgit clone --depth 1 https://github.com/itsmostafa/llm-engineering-skillsWrote 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/itsmostafa/llm-engineering-skills/claude-md)<a href="https://agentmods.dev/instructions/itsmostafa/llm-engineering-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/itsmostafa/llm-engineering-skills/claude-md.svg" alt="Measured on agentmods" 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 | $0.00524 | $0.00524 |
| Opus 5 | $0.00262 | $0.00262 |
| Sonnet 5 | $0.00105 | $0.00105 |
| Haiku 4.5 | $0.00052 | $0.00052 |
Grade A, and why
llm-engineering-skills 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 8d 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 — 65 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.
Repository Purpose
This repository contains Claude Agent Skills for LLM engineering tasks. Skills are modular, filesystem-based capabilities that extend Claude's functionality with domain-specific expertise.
Repository Files
REFERENCES.md- External resources and documentation referenced across skills. Update this file when creating new skills that reference external sources..claude-plugin/marketplace.json- Plugin manifest listing all available skills. Update this file whenever a new skill is added.
Skill Structure
Each skill follows this structure:
skills/
└── skill-name/
├── SKILL.md # Required: main instructions with YAML frontmatter
├── reference/ # Optional: detailed documentation
└── scripts/ # Optional: utility scripts
SKILL.md Requirements
---
name: skill-name # lowercase, hyphens only, max 64 chars
description: Brief description of what this Skill does and when to use it. Max 1024 chars.
---
[Markdown instructions - keep under 500 lines]
Naming: Use simple, descriptive names (e.g., pytorch, transformers, lora, mlx, rlhf)
Description: Write in third person. Include both what the skill does AND when Claude should use it.
Recommended Sections
Skills should include these sections where applicable:
- Table of Contents - Required for files over 100 lines
- Core Concepts - Foundational knowledge for the topic
- Practical Patterns - Code examples and usage patterns
- Best Practices - Numbered list of key recommendations
- References - Links to files in
reference/directory
Authoring Guidelines
- Be concise - assume Claude already knows common concepts
- Use progressive disclosure: SKILL.md provides overview, reference files contain details
- Keep references one level deep from SKILL.md
- Include table of contents for files over 100 lines
- Always use forward slashes in paths (Unix-style)
- For executable scripts: make clear if Claude should run vs read them
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.
- 8d ago First seen · 65 lines · 524 tokens per session scan A 19b4673d6d0b
llm-engineering-skills CLAUDE.md is an instructions file published in the GitHub repository itsmostafa/llm-engineering-skills (23 stars, last pushed 4mo ago), licensed MIT. It adds 524 tokens to every session, about $0.0026 per session on Opus 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
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.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
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.
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.