Prompt Engineering Guide is a collection of guides, papers, lessons, notebooks, references, and tools for designing prompts and working with language models, retrieval-augmented generation, context engineering, and AI agents. It is for researchers and developers who use language models and want to understand or improve their behavior. The catalogue instruction provides an add-on for using this learning material.
Borrowing it
Nothing to install: this file belongs to dair-ai/Prompt-Engineering-Guide. 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/dair-ai/Prompt-Engineering-Guide/main/CLAUDE.mdgit clone --depth 1 https://github.com/dair-ai/Prompt-Engineering-GuideWrote 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/dair-ai/prompt-engineering-guide/claude-md)<a href="https://agentmods.dev/instructions/dair-ai/prompt-engineering-guide/claude-md"><img src="https://agentmods.dev/badge/instructions/dair-ai/prompt-engineering-guide/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/dair-ai/prompt-engineering-guide/claude-md"><img src="https://agentmods.dev/badge/instructions/dair-ai/prompt-engineering-guide/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 | $0.00135 | $0.00135 |
| Opus 5.5 | $0.00054 | $0.00054 |
| Sonnet 5.5 | $0.00027 | $0.00027 |
| Haiku 4.5 | $0.00014 | $0.00014 |
Grade A, and why
Prompt-Engineering-Guide 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.
What it actually says
Prompt Engineering Guide
Project Overview
Open-source prompt engineering guide at promptingguide.ai. Built with Next.js (Nextra theme).
Project Learnings
Read and follow the project learnings in Prompt-Engineering-Guide-notes/learnings/ before starting work. These are distilled from past session corrections and contain important patterns for this project.
Notes & Content
- All project notes go in
Prompt-Engineering-Guide-notes/(Obsidian vault inside the project root)
Git Workflow
- Do NOT push to remote unless explicitly asked by the user
- Commits are fine, but always wait for user to request push
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 · 15 lines · 135 tokens per session scan A 32e10f2c13ae
Prompt-Engineering-Guide CLAUDE.md is an instructions file published in the GitHub repository dair-ai/Prompt-Engineering-Guide (79,853 stars, last pushed 8mo ago), licensed MIT. It adds 135 tokens to every session, about $0.0005 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.
Prompt-Engineering-Guide CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| Prompt-Engineering-Guide CLAUDE.mddair-ai/Prompt-Engineering-Guide | Instructions file | 80k | 8mo ago | MIT | A | 135 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |