A JavaScript and TypeScript runtime and package manager that can replace Node.js, npm, pnpm, and some build tools. It also provides built-in APIs for servers, databases, files, shell commands, WebSockets, and tests.

Use it to run JavaScript or TypeScript, install dependencies, execute scripts, build front ends, serve HTTP or WebSocket applications, work with SQLite, Redis, PostgreSQL, files, environment variables, and tests.

It gives projects one tool for running code, installing packages, building applications, and testing them, with command mappings for common Node.js workflows.

bun — Skill for Claude Code and Codex by sutchan

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.

Any agent

npx skills add sutchan/Agent-Skills-Hub --skill bun

Clone the repo

git clone --depth 1 https://github.com/sutchan/Agent-Skills-Hub

Made for: Claude Code, Codex.

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/skills/sutchan/agent-skills-hub/bun/github.svg)](https://agentmods.dev/skills/sutchan/agent-skills-hub/bun)

Your own site

<a href="https://agentmods.dev/skills/sutchan/agent-skills-hub/bun"><img src="https://agentmods.dev/badge/skills/sutchan/agent-skills-hub/bun/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/skills/sutchan/agent-skills-hub/bun"><img src="https://agentmods.dev/badge/skills/sutchan/agent-skills-hub/bun.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 615 The whole file, excluding the scripts and references it only reads on demand.

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	$0.00032	$0.00615
Opus 5	$0.00016	$0.00308
Sonnet 5	$0.00006	$0.00123
Haiku 4.5	$0.00003	$0.00061

Measured 10d ago against content hash 06fc252d8c6d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

bun 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 10d 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

Copies of this mod

1 near-identical copy found in the catalogue:

bun — 94% identical, 7 lines differ

skills/bun/SKILL.md · 91 lines

What it actually says

Bun Runtime

Use Bun as the default JavaScript/TypeScript runtime and package manager.

Command Mappings

Instead of	Use
`node file.ts`	`bun file.ts`
`ts-node file.ts`	`bun file.ts`
`npm install`	`bun install`
`npm run script`	`bun run script`
`jest` / `vitest`	`bun test`
`webpack` / `esbuild`	`bun build`

Bun automatically loads .env files - don't use dotenv.

Bun-Specific APIs

Prefer these over Node.js equivalents:

API	Purpose	Don't use
`Bun.serve()`	HTTP server with WebSocket, HTTPS, routes	express
`bun:sqlite`	SQLite database	better-sqlite3
`Bun.redis`	Redis client	ioredis
`Bun.sql`	Postgres client	pg, postgres.js
`Bun.file()`	File operations	node:fs readFile/writeFile
`Bun.$\`cmd``	Shell commands	execa
`WebSocket`	WebSocket client (built-in)	ws

Testing

Use bun:test for tests:

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

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

Run with bun test.

Frontend Development

Use HTML imports with Bun.serve() instead of Vite. Supports React, CSS, Tailwind.

Server:

import index from "./index.html"

Bun.serve({
  routes: {
    "/": index,
    "/api/users/:id": {
      GET: (req) => Response.json({ id: req.params.id }),
    },
  },
  development: { hmr: true, console: true }
})

HTML file:

<html>
  <body>
    <script type="module" src="./app.tsx"></script>
  </body>
</html>

Bun's bundler transpiles .tsx, .jsx, .js automatically. CSS is bundled via <link> tags.

Run with bun --hot ./server.ts for HMR.

Documentation

For detailed API docs, see node_modules/bun-types/docs/**.md.

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.

10d ago First seen · 91 lines · 32 tokens per session scan A 06fc252d8c6d

Subscribe to this mod's changes

bun is a skill published in the GitHub repository sutchan/Agent-Skills-Hub (2 stars, last pushed yesterday), licensed MIT. It adds 32 tokens to every session and 615 once invoked, about $0.0002 per session on Opus 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.

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