What is m2e CLAUDE.md?

Project instructions for M2E, a Go and React desktop application that converts American English to international or British spelling and can convert imperial units to metric.

Use them when working on M2E's Wails desktop interface, CLI, HTTP API, MCP server, text conversion, unit conversion, or code-aware processing.

They explain the application's backend, frontend, conversion logic, and different ways users can interact with it before code is changed.

How sammcj/m2e configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to sammcj/m2e. 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/sammcj/m2e/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/sammcj/m2e

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/sammcj/m2e/claude-md/github.svg)](https://agentmods.dev/instructions/sammcj/m2e/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/sammcj/m2e/claude-md"><img src="https://agentmods.dev/badge/instructions/sammcj/m2e/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/sammcj/m2e/claude-md"><img src="https://agentmods.dev/badge/instructions/sammcj/m2e/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,004 This file is loaded in full into every session.

When invoked 1,004 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	$0.01004	$0.01004
Opus 5.5	$0.00402	$0.00402
Sonnet 5.5	$0.00201	$0.00201
Haiku 4.5	$0.00100	$0.00100

Measured 2mo ago against content hash f4f96b1078c4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

m2e 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 · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 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.

Project Overview

M2E is a text conversion application that converts American English to standard international / British English spellings with a tongue-and-cheek approach to it's functionality naming, with optional imperial-to-metric unit conversion. Built with Go backend and React frontend using Wails v2 framework.

Core Architecture

Main Components

Backend: Go application (app.go, main.go) using Wails v2 for native desktop app
Frontend: React SPA in frontend/ directory with Vite build system
Converter Package: Core logic in pkg/converter/ handles text conversion and unit processing
Multiple Interface Modes: GUI (Wails), CLI with integrated report mode, HTTP API server, and MCP server

Key Files

app.go: Application binding and frontend interface methods
pkg/converter/converter.go: Core conversion logic with embedded dictionaries
pkg/converter/unit_*.go: Unit conversion system (detector, patterns, config)
pkg/converter/codeaware.go: Code-aware conversion preserving syntax
cmd/: Different executable entry points (CLI with report mode, server, MCP)
pkg/report/: Report generation and analysis functionality

Development Commands

Build and Test

make                # Default: lint, test, build all
make lint           # Run golangci-lint and formatting checks
make test           # Run all tests in tests/ directory
make build          # Build all applications (GUI, CLI, server, MCP)

Build VSCode Extension

make vscode-build   # Build VSCode extension for M2E - This is already triggered by `make build`

Individual Builds

make build-wails    # GUI application (macOS app bundle)
make build-cli      # Command-line interface with integrated report mode
make build-server   # HTTP API server
make build-mcp      # MCP server for AI tools
make vscode-build   # VSCode extension

Read the full file on GitHub · 122 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 · 122 lines · 1,004 tokens per session scan A f4f96b1078c4

Subscribe to this mod's changes

m2e CLAUDE.md is an instructions file published in the GitHub repository sammcj/m2e (5 stars, last pushed today), licensed MIT. It adds 1,004 tokens to every session, about $0.0040 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.

Localization agent agentic ai cline conversion dictionary

m2e CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
m2e CLAUDE.mdsammcj/m2e	Instructions file	5	today	MIT	A	1,004	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	5,685	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	3,086	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	280k	2d ago	MIT	A	4,325	Codex, OpenCode

m2e: Instructions file for Claude Code