What is stwo-cairo CLAUDE.md?

Claude Code instructions for the stwo-cairo project. They document project priorities, its software stack, workspace layout, generated code, and commands.

Use them when asking Claude Code to inspect, edit, generate, or run commands in stwo-cairo.

They give Claude Code the project rules and structure needed to work without guessing how the repository is organized.

How starkware-libs/stwo-cairo configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to starkware-libs/stwo-cairo. 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/starkware-libs/stwo-cairo/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/starkware-libs/stwo-cairo

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/starkware-libs/stwo-cairo/claude-md/github.svg)](https://agentmods.dev/instructions/starkware-libs/stwo-cairo/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/starkware-libs/stwo-cairo/claude-md"><img src="https://agentmods.dev/badge/instructions/starkware-libs/stwo-cairo/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/starkware-libs/stwo-cairo/claude-md"><img src="https://agentmods.dev/badge/instructions/starkware-libs/stwo-cairo/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,164 This file is loaded in full into every session.

When invoked 2,164 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 unknown 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	$0.02164	$0.02164
Opus 5.5	$0.00866	$0.00866
Sonnet 5.5	$0.00433	$0.00433
Haiku 4.5	$0.00216	$0.00216

Measured 2mo ago against content hash 94bcd553d777, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

stwo-cairo 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 · 205 lines

The source is not reproduced here

No licence file

Read it on GitHub

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 · 205 lines · 2,164 tokens per session scan A 94bcd553d777

Subscribe to this mod's changes

stwo-cairo CLAUDE.md is an instructions file published in the GitHub repository starkware-libs/stwo-cairo (286 stars, last pushed 1mo ago), with no licence file. It adds 2,164 tokens to every session, about $0.0087 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.

Rust cairo circle-stark stark zero-knowledge zkvm

stwo-cairo CLAUDE.md next to 6 instructions from other repositories
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vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
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stwo-cairo: Instructions file for Claude Code