What is guillotine-mini CLAUDE.md?

A project instruction file for Guillotine Mini, a Zig implementation of the Ethereum Virtual Machine—the software that runs Ethereum smart-contract bytecode.

Use it when building, testing, debugging, validating Ethereum specifications, or producing the project's WebAssembly library.

It records the commands, required tools, architecture, and testing approach needed to work safely in this codebase.

How evmts/guillotine-mini configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to evmts/guillotine-mini. 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/evmts/guillotine-mini/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/evmts/guillotine-mini

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/evmts/guillotine-mini/claude-md/github.svg)](https://agentmods.dev/instructions/evmts/guillotine-mini/claude-md)

Your own site

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

Per session 7,337 This file is loaded in full into every session.

When invoked 7,337 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	$0.07337	$0.07337
Opus 5.5	$0.02935	$0.02935
Sonnet 5.5	$0.01467	$0.01467
Haiku 4.5	$0.00734	$0.00734

Measured 2mo ago against content hash 2472c86089f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

guillotine-mini 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 · 771 lines

How it starts

The opening of the file, as written. The whole thing — 771 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Guillotine Mini - EVM Implementation

Minimal, correct, and well-tested Ethereum Virtual Machine (EVM) implementation in Zig, prioritizing specification compliance, clarity, and hardfork support (Berlin through Prague).

Quick Start

zig build              # Build all modules
zig build test         # Run unit + spec tests
zig build specs        # Run ethereum/tests validation
zig build wasm         # Build WebAssembly library
zig build test-watch   # Interactive test runner

# Debug failing tests (recommended)
bun scripts/isolate-test.ts "test_name"  # Max debug output + analysis
bun scripts/test-subset.ts "pattern"     # Filter test categories

Prerequisites

Zig 0.15.1+ (core build system)
Cargo (required for BN254/ARK cryptographic dependencies)
Python 3.8+ (test generation and reference implementation)
uv (Python package manager for spec fixture generation): brew install uv
Bun (TS helpers/agents): brew install bun

Architecture

src/
├── evm.zig               # Orchestrator: state, storage, gas refunds, nested calls
├── frame.zig             # Bytecode interpreter: stack, memory, PC, per-opcode logic
├── host.zig              # Abstract state backend interface
├── hardfork.zig          # Hardfork detection and feature flags
├── opcode.zig            # Opcode definitions and utilities
├── trace.zig             # EIP-3155 trace generation
└── errors.zig            # Error types

External Dependencies (fetched via zig build):
├── primitives            # Ethereum types (Address, u256, gas constants, RLP, ABI, etc.)
│                         # Source: https://github.com/evmts/primitives
├── crypto                # Cryptographic primitives (keccak256, secp256k1, BLS12-381)
└── precompiles           # Ethereum precompiled contracts

Core Responsibilities

Component	Responsibility
Evm	State management, storage, gas refunds, warm/cold tracking, nested calls
Frame	Stack, memory, PC, bytecode interpretation, opcode execution
Host	Pluggable state backend (balances, nonces, code, logs, self-destruct)
Hardfork	Gas cost adjustments, feature flag guards (`isAtLeast()`, `isBefore()`)

Read the full file on GitHub · 771 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 · 771 lines · 7,337 tokens per session scan A 2472c86089f7

Subscribe to this mod's changes

guillotine-mini CLAUDE.md is an instructions file published in the GitHub repository evmts/guillotine-mini (11 stars, last pushed 2mo ago), licensed MIT. It adds 7,337 tokens to every session, about $0.0293 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.

Debugging Web3 and blockchain

guillotine-mini CLAUDE.md next to 6 instructions from other repositories
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guillotine-mini: Instructions file for Claude Code