What is adrkit use-bun.instructions.md?

A set of project instructions that tells coding agents to use Bun for JavaScript and TypeScript work. Bun is a runtime, package manager, test runner, and build tool that can replace tools such as Node.js, npm, and Vite in the specified cases.

Use it when installing dependencies, running scripts or tests, building files, serving applications, or choosing JavaScript and TypeScript APIs.

It keeps commands and libraries consistent with a project that has chosen Bun. This avoids mixing different runtimes, package managers, test tools, and server libraries.

adrkit use-bun.instructions.md — Instructions file by mbeacom

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add instructions/mbeacom/adrkit/use-bun

Clone the repo

git clone --depth 1 https://github.com/mbeacom/adrkit

Made for: GitHub Copilot.

Per session 776 This file is loaded in full into every session.

When invoked 776 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

Origin 91% 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	$0.00776	$0.00776
Opus 5	$0.00388	$0.00388
Sonnet 5	$0.00155	$0.00155
Haiku 4.5	$0.00078	$0.00078

Measured 2d ago against content hash fb42830de10b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

adrkit use-bun.instructions.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 2d 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

91% identical to claude-peers-mcp CLAUDE.md — 35 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.

.github/instructions/use-bun.instructions.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 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>
Use bunx <package> <command> instead of npx <package> <command>
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>

Read the full file on GitHub · 111 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.

2d ago First seen · 111 lines · 776 tokens per session scan A fb42830de10b

Subscribe to this mod's changes

adrkit use-bun.instructions.md is an instructions file published in the GitHub repository mbeacom/adrkit (11 stars, last pushed 3d ago), licensed Apache-2.0. It adds 776 tokens to every session, about $0.0039 per session on Opus 5. A static security scan graded it A with 0 findings. It is 91% identical to claude-peers-mcp CLAUDE.md, differing in 35 lines, and is treated as a copy.

Languages Planning Testing adr ai-agents architecture architecture-decision-records backstage developer-experience

adrkit use-bun.instructions.md

Getting it into your agent

What it costs to keep this loaded

Grade A, and why

Nothing flagged

This is a copy

How it starts

APIs

Testing

Frontend

What this file has done since we first saw it

Other instructions, from other repositories

cli CLAUDE.md

mcp-adr-analysis-server copilot-instructions.md

codebase-intel CLAUDE.md

adr copilot-instructions.md

adr-kit CLAUDE.md

docflow AGENTS.md