What is codemogger CLAUDE.md?

A set of project rules that makes Bun the default JavaScript runtime, package manager, build tool, and test runner. It also lists preferred Bun APIs for servers, databases, files, and environment variables.

Use it when installing dependencies, running scripts or tests, building frontend code, creating a server, accessing SQLite or PostgreSQL, or reading files and environment variables.

It prevents contributors from mixing incompatible tools or following the wrong commands for this project. The rules also define the project’s preferred replacements for common Node.js packages and tools.

How glommer/codemogger configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to glommer/codemogger. 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/glommer/codemogger/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/glommer/codemogger

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/glommer/codemogger/claude-md/github.svg)](https://agentmods.dev/instructions/glommer/codemogger/claude-md)

Your own site

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

Per session 747 This file is loaded in full into every session.

When invoked 747 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 88% copy Near-identical to another mod 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	$0.00747	$0.00747
Opus 5.5	$0.00299	$0.00299
Sonnet 5.5	$0.00149	$0.00149
Haiku 4.5	$0.00075	$0.00075

Measured 2mo ago against content hash d2a17c0be710, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

codemogger 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.

Origin

This is a copy

88% identical to claude-peers-mcp CLAUDE.md — 36 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Default to using Bun instead of Node.js.

Use bun <file> instead of node <file> or ts-node <file>
Use bun test instead of jest or vitest
Use bun build <file.html|file.ts|file.css> instead of webpack or esbuild
Use bun install instead of npm install or yarn install or pnpm install
Use bun run <script> instead of npm run <script> or yarn run <script> or pnpm run <script>
Bun automatically loads .env, so don't use dotenv.

APIs

Bun.serve() supports WebSockets, HTTPS, and routes. Don't use express.
bun:sqlite for SQLite. Don't use better-sqlite3.
Bun.redis for Redis. Don't use ioredis.
Bun.sql for Postgres. Don't use pg or postgres.js.
WebSocket is built-in. Don't use ws.
Prefer Bun.file over node:fs's readFile/writeFile
Bun.$ls instead of execa.

Testing

Use bun test to run tests.

import { test, expect } from "bun:test";

test("hello world", () => {
  expect(1).toBe(1);
});

Frontend

Use HTML imports with Bun.serve(). Don't use vite. HTML imports fully support React, CSS, Tailwind.

Server:

import index from "./index.html"

Bun.serve({
  routes: {
    "/": index,
    "/api/users/:id": {
      GET: (req) => {
        return new Response(JSON.stringify({ id: req.params.id }));
      },
    },
  },
  // optional websocket support
  websocket: {
    open: (ws) => {
      ws.send("Hello, world!");
    },
    message: (ws, message) => {
      ws.send(message);
    },
    close: (ws) => {
      // handle close
    }
  },
  development: {
    hmr: true,
    console: true,
  }
})

HTML files can import .tsx, .jsx or .js files directly and Bun's bundler will transpile & bundle automatically. <link> tags can point to stylesheets and Bun's CSS bundler will bundle.

<html>
  <body>
    <h1>Hello, world!</h1>
    <script type="module" src="./frontend.tsx"></script>
  </body>
</html>

With the following frontend.tsx:

Read the full file on GitHub · 112 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 · 112 lines · 747 tokens per session scan A d2a17c0be710

Subscribe to this mod's changes

codemogger CLAUDE.md is an instructions file published in the GitHub repository glommer/codemogger (349 stars, last pushed 5mo ago), licensed MIT. It adds 747 tokens to every session, about $0.0030 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 88% identical to claude-peers-mcp CLAUDE.md, differing in 36 lines, and is treated as a copy.

codemogger CLAUDE.md next to 6 instructions from other repositories
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codemogger CLAUDE.mdglommer/codemogger	Instructions file	349	5mo ago	MIT	A	747	Claude Code
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codemogger: Instructions file for Claude Code