Bun

What it does

When your agent uses it

• Bundling JavaScript/TypeScript applications

Example prompts

• “/bun”

Requirements

• Node.js

Workflow steps

7 steps, taken from the step headings in SKILL.md.

1. 1Start a New Project
2. 2Add Dependencies
3. 3Write and Run Code
4. 4Write Tests
5. 5Build for Production
6. 6Configure bunfig.toml (Optional)
7. 7Deploy

What it can do on your machine

Read from SKILL.md and the folder at commit c7605d6. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • bun
  • bunx
  • tsc

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • bun.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Bun loads about 2k tokens when it runs. Until then it costs about 75 tokens; SKILL.md has 773 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~75

When it runs · the whole SKILL.md, loaded when a task matches

~2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NoteMentions a .env fileSKILL.md:74

  | `.env` | Environment variables (auto-loaded) |

• NoteMentions a .env fileSKILL.md:235

  **Environment variables auto-load from `.env`:** Disable with `env = false` in `bunfig.toml` if needed

• NoteMentions a .env fileSKILL.md:256

  ] Environment variables are set (check `.env` or CI/CD config)

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from galfrevn/apollo at commit c7605d6, republished under its MIT licence (© galfrevn). 773 words, ~2,001 tokens.

name

bun

description

Use when building, running, testing, or bundling JavaScript/TypeScript applications. Reach for Bun when you need to execute scripts, manage dependencies, run tests, or bundle code for production. Bun is a drop-in replacement for Node.js with integrated package manager, test runner, and bundler.

metadata.mintlify-proj

bun

metadata.version

1.0

# Runtime
[serve]
port = 3000

[test]
root = "./__tests__"
coverage = true
timeout = 5000

[install]
optional = true
dev = true
production = false
linker = "hoisted"  # or "isolated"

[run]
shell = "system"
bun = true
silent = false

bun init
# Choose template: Blank, React, or Library
cd my-app
bun run index.ts

bun add react react-dom
bun add -d typescript @types/react

# Edit index.ts with TypeScript/JSX
bun run index.ts

# Or watch for changes
bun --watch run index.ts

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

test("2 + 2 = 4", () => {
  expect(2 + 2).toBe(4);
});

bun test
bun test --watch
bun test --coverage

# Bundle for browser
bun build ./src/index.tsx --outdir ./dist --target browser

# Bundle for server
bun build ./src/server.ts --outdir ./dist --target bun

# Create single executable
bun build ./src/server.ts --outfile app --target bun

[serve]
port = 8080

[test]
coverage = true
timeout = 10000

[install]
linker = "isolated"

# Build for production
bun build ./src/server.ts --outdir ./dist --minify

# Run in production
bun ./dist/server.js

© galfrevn, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/bun of galfrevn/apollo.

Open the folder on GitHubat commit c7605d6