Agent skill

Bun

A skill your agent uses when building, testing, and deploying JavaScript/TypeScript applications.

Custom licenceAuto-check passedTesting & QA

Install Bun

skills CLI

$ npx skills add bastani-inc/atomic --skill bun -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install bastani-inc/atomic bun --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/bastani-inc/atomic.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/bun .claude/skills/bun && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "bun" agent skill from https://github.com/bastani-inc/atomic/tree/main/.agents/skills/bun into .claude/skills/bun/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/bastani-inc/atomic/tree/main/.agents/skills/bun

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add bastani-inc/atomic --skill bun -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install bastani-inc/atomic bun --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/bastani-inc/atomic.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/bun .agents/skills/bun && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "bun" agent skill from https://github.com/bastani-inc/atomic/tree/main/.agents/skills/bun into .agents/skills/bun/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add bastani-inc/atomic --skill bun -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install bastani-inc/atomic bun --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/bastani-inc/atomic.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/bun .cursor/skills/bun && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "bun" agent skill from https://github.com/bastani-inc/atomic/tree/main/.agents/skills/bun into .cursor/skills/bun/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/bastani-inc/atomic.git --path .agents/skills/bun

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add bastani-inc/atomic --skill bun -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install bastani-inc/atomic bun --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/bastani-inc/atomic.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/bun .gemini/skills/bun && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "bun" agent skill from https://github.com/bastani-inc/atomic/tree/main/.agents/skills/bun into .gemini/skills/bun/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install bastani-inc/atomic bun

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add bastani-inc/atomic --skill bun -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/bastani-inc/atomic.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/bun .github/skills/bun && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "bun" agent skill from https://github.com/bastani-inc/atomic/tree/main/.agents/skills/bun into .github/skills/bun/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add bastani-inc/atomic --skill bun -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install bastani-inc/atomic bun --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/bastani-inc/atomic.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/bun .opencode/skills/bun && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "bun" agent skill from https://github.com/bastani-inc/atomic/tree/main/.agents/skills/bun into .opencode/skills/bun/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: bun
GitHub stars: 850
Token cost: ~2.8k tokens
SKILL.md length: 961 words
Files: 1
Skills in repo: 15
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: Custom licence

At a glance

A skill your agent uses when building, testing, and deploying JavaScript/TypeScript applications.

Works in 8 steps: Initialize a Project → Install Dependencies → Add Packages → …
Deploying JavaScript/TypeScript applications
SKILL.md covers Product Summary, When to Use, Quick Reference and Decision Guidance, plus 4 more sections
Calls bun, node and tsc

What it does

Bun is an agent skill from bastani-inc/atomic. Use when building, testing, and deploying JavaScript/TypeScript applications. Reach for Bun when you need to run scripts, manage dependencies, bundle code, or test applications with a single unified tool.

Its SKILL.md is about 2.8k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA. It works with JavaScript, TypeScript, npm and Node.js. The repository describes itself as: The verifiable coding agent runtime. Define your coding agent's process in natural language with stages, checks, and approval gates instead of hoping it follows your…

When your agent uses it

Deploying JavaScript/TypeScript applications

Example prompts

“/bun”

Requirements

Node.js

Workflow steps

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

Initialize a Project
Install Dependencies
Add Packages
Write and Run Code
Create HTTP Server
Write Tests
Bundle for Production
Create Standalone Executable

What it can do on your machine

Read from SKILL.md and the folder at commit ad79904. 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
- node
- 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 2.8k tokens when it runs. Until then it costs about 52 tokens; SKILL.md has 961 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~52
When it runs · the whole SKILL.md, loaded when a task matches: ~2.8k

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 961 words (~2,834 tokens).

“Bun is a unified JavaScript runtime, package manager, bundler, and test runner written in Zig. It replaces Node.js, npm, esbuild, and Jest with a single fast binary. Key files: bunfig.toml (configuration), bun.lock (lockfile), package.json (project metadata). Primary commands: bun run…”

— opening of SKILL.md by bastani-inc, Custom licence

name: bun
metadata.mintlify-proj: bun
metadata.version: 1.0
metadata.internal: true

Outline of SKILL.md

Bun Skill Reference
Product Summary
When to Use
Quick Reference
Essential Commands
Configuration File: bunfig.toml
File Types Supported
Key Bun APIs
Decision Guidance
When to Use Hoisted vs Isolated Linker
When to Use bun build vs bun run
When to Use --concurrent in Tests
Workflow
1. Initialize a Project
2. Install Dependencies
3. Add Packages
4. Write and Run Code
5. Create HTTP Server
6. Write Tests
7. Bundle for Production
8. Create Standalone Executable
Common Gotchas
Verification Checklist
Resources

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/bun of bastani-inc/atomic.

Open the folder on GitHubat commit ad79904

Compare with similar skills

Bun next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Bun compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Bun this skillbastani-inc/atomic	850	—	~2.8k	Automated safety check: Pass	Custom licence	today
Bungalfrevn/apollo	237	—	~2k	Automated safety check: Notes	MIT	1 mo ago
Bun Runtime and Toolkitmweinbach/agent-coworker	156	—	~2.2k	Automated safety check: Notes	Custom licence	yesterday
Javascript SDKaiskillstore/marketplace	430	1 repos	~3.3k	Automated safety check: Pass	None	today
Otel JSollygarden/opentelemetry-agent-skills	106	—	~655	Automated safety check: Pass	Apache-2.0	yesterday
Bun DevelopmentGabrielMartinMoran/mind	148	12 repos	~3.5k	Automated safety check: Notes	MIT	9 days ago

Similar skills

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Questions about Bun

What does Bun do?

A skill your agent uses when building, testing, and deploying JavaScript/TypeScript applications. Bun is an agent skill from bastani-inc/atomic. Use when building, testing, and deploying JavaScript/TypeScript applications.

When should I use Bun?

Bun fits situations like: deploying JavaScript/TypeScript applications.

How do I install Bun in Claude Code?

Run `npx skills add bastani-inc/atomic --skill bun -a claude-code`. Or copy the skill folder (.agents/skills/bun in bastani-inc/atomic) into .claude/skills/bun in your project. Claude Code loads it when a task matches its description.

How do I install Bun in Codex?

Run `npx skills add bastani-inc/atomic --skill bun -a codex`. Or copy the skill folder (.agents/skills/bun in bastani-inc/atomic) into .agents/skills/bun in your project. Codex loads it when a task matches its description.

Can I use Bun in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add bastani-inc/atomic --skill bun -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/bun, .gemini/skills/bun, .github/skills/bun and .opencode/skills/bun in your project.

What does Bun need to run?

Going by SKILL.md and its folder, Bun needs the command-line tools its instructions call (bun, node and tsc). Our summary lists: Node.js.

Does Bun access the network?

SKILL.md names 1 domain. As links in the text: bun.com. This is read from the text; nothing was executed.

Is Bun safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Bun use?

Bun has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Bun use?

About 2.8k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Bun?

Skills that share tags, products or a category with Bun: Bun (galfrevn/apollo, 237 stars), Bun Runtime and Toolkit (mweinbach/agent-coworker, 156 stars), Javascript SDK (aiskillstore/marketplace, 430 stars) and Otel JS (ollygarden/opentelemetry-agent-skills, 106 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Bun?

bastani-inc (a GitHub organization) maintains it in bastani-inc/atomic, which has 850 GitHub stars. The repository holds 15 skills in this directory. The repository was last updated on October 9, 2026.

Source: bastani-inc/atomic on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Bun

Install Bun

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

Bun

Bun Runtime and Toolkit

Javascript SDK

Otel JS

Bun Development

E2E Test

More from bastani-inc/atomic

How

Liteparse

Feedback

Prek

TDD

Tmux

Questions about Bun

Install Bun

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

More from bastani-inc/atomic

Related

Questions about Bun