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Agent skill

Bun Runtime

by affaan-m in affaan-m/ECC

Bun 作为运行时、包管理器、打包器和测试运行器。何时选择 Bun 而非 Node、迁移注意事项以及 Vercel 支持。

MITAuto-check: notes

Install Bun Runtime

skills CLI
$ npx skills add affaan-m/ECC --skill bun-runtime -a claude-code

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

GitHub CLI
$ gh skill install affaan-m/ECC bun-runtime --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/affaan-m/ECC.git skills-src && mkdir -p .claude/skills && cp -r skills-src/docs/zh-CN/skills/bun-runtime .claude/skills/bun-runtime && 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/

Facts

Skill name
bun-runtime
GitHub stars
276k
Used in
1 other repo
Token cost
~443 tokens
SKILL.md length
120 words
Files
1
Skills in repo
673
Repo updated
First seen
Licence
MIT

At a glance

Bun 作为运行时、包管理器、打包器和测试运行器。何时选择 Bun 而非 Node、迁移注意事项以及 Vercel 支持。

  • SKILL.md covers 何时使用, 工作原理, 示例 and 最佳实践
  • Calls bun, node and npm

What it does

Bun Runtime is an agent skill from affaan-m/ECC. Bun 作为运行时、包管理器、打包器和测试运行器。何时选择 Bun 而非 Node、迁移注意事项以及 Vercel 支持。

Its SKILL.md is about 440 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Bun, Vercel and npm. The repository describes itself as: The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond. The licence is MIT.

Example prompts

  • “/bun-runtime”

Requirements

  • Node.js

What it can do on your machine

Read from SKILL.md and the folder at commit ef648e0. 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
    • npm

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

  • Network

    No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.

    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 Runtime loads about 443 tokens when it runs. Until then it costs about 18 tokens; SKILL.md has 120 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~18
When it runs · the whole SKILL.md, loaded when a task matches
~443

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NoteMentions a .env fileSKILL.md:46
    bun run --env-file=.env dev

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 affaan-m/ECC at commit ef648e0, republished under its MIT licence (© affaan-m). 120 words, ~443 tokens.

Download SKILL.mdSave it as .claude/skills/bun-runtime/SKILL.md (or your agent's skills folder).
name
bun-runtime
description
Bun 作为运行时、包管理器、打包器和测试运行器。何时选择 Bun 而非 Node、迁移注意事项以及 Vercel 支持。
origin
ECC

Bun 运行时

Bun 是一个快速的全能 JavaScript 运行时和工具集：运行时、包管理器、打包器和测试运行器。

何时使用

  • 优先选择 Bun 用于：新的 JS/TS 项目、安装/运行速度很重要的脚本、使用 Bun 运行时的 Vercel 部署，以及当您想要单一工具链（运行 + 安装 + 测试 + 构建）时。
  • 优先选择 Node 用于：最大的生态系统兼容性、假定使用 Node 的遗留工具，或者当某个依赖项存在已知的 Bun 问题时。

在以下情况下使用：采用 Bun、从 Node 迁移、编写或调试 Bun 脚本/测试，或在 Vercel 或其他平台上配置 Bun。

工作原理

  • 运行时：开箱即用的 Node 兼容运行时（基于 JavaScriptCore，用 Zig 实现）。
  • 包管理器：bun install 比 npm/yarn 快得多。在当前 Bun 中，锁文件默认为 bun.lock（文本）；旧版本使用 bun.lockb（二进制）。
  • 打包器：用于应用程序和库的内置打包器和转译器。
  • 测试运行器：内置的 bun test，具有类似 Jest 的 API。

从 Node 迁移：将 node script.js 替换为 bun run script.js 或 bun script.js。运行 bun install 代替 npm install；大多数包都能工作。使用 bun run 来执行 npm 脚本；使用 bun x 进行 npx 风格的临时运行。支持 Node 内置模块；在存在 Bun API 的地方优先使用它们以获得更好的性能。

Vercel：在项目设置中将运行时设置为 Bun。构建命令：bun run build 或 bun build ./src/index.ts --outdir=dist。安装命令：bun install --frozen-lockfile 用于可重复的部署。

示例

运行和安装
bash
# Install dependencies (creates/updates bun.lock or bun.lockb)
bun install

# Run a script or file
bun run dev
bun run src/index.ts
bun src/index.ts
脚本和环境变量
bash
bun run --env-file=.env dev
FOO=bar bun run script.ts
测试
bash
bun test
bun test --watch
typescript
// test/example.test.ts
import { expect, test } from "bun:test";

test("add", () => {
  expect(1 + 2).toBe(3);
});
运行时 API
typescript
const file = Bun.file("package.json");
const json = await file.json();

Bun.serve({
  port: 3000,
  fetch(req) {
    return new Response("Hello");
  },
});

最佳实践

  • 提交锁文件（bun.lock 或 bun.lockb）以实现可重复的安装。
  • 在脚本中优先使用 bun run。对于 TypeScript，Bun 原生运行 .ts。
  • 保持依赖项最新；Bun 和生态系统发展迅速。

© affaan-m, 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 docs/zh-CN/skills/bun-runtime of affaan-m/ECC.

Open the folder on GitHubat commit ef648e0

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in affaan-m/ECC, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Bun Runtime 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 Runtime compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Bun Runtime this skillaffaan-m/ECC276k1 repos~443Automated safety check: NotesMIT
Bun Runtimespinspire/pocketbase-sveltekit-starter5115 repos~653Automated safety check: NotesMIT
Vercel Deploybytedance/deer-flow84k10 repos~797Automated safety check: PassMIT
Before and After Screenshotsmichaelshimeles/skills1.3k1 repos~1kAutomated safety check: PassMIT
Next Upgradevercel-labs/openreview1.7k6 repos~502Automated safety check: PassNone
Check Deps SyncHyk260/PureChat546—~594Automated safety check: PassMIT

Similar skills

  • Bun Runtime

    spinspire/pocketbase-sveltekit-starter

    Bun as runtime, package manager, bundler, and test runner. An agent skill from spinspire/pocketbase-sveltekit-starter.

    511 GitHub starsUsed in 5 repos~653 tokens
    Frontend & DesignAuto-check: notes

  • Vercel Deploy

    bytedance/deer-flow

    Deploys a project to Vercel with one script and no login, then returns a live preview URL and a claim link for moving the deployment into your own Vercel account.

    84k GitHub starsUsed in 10 repos~797 tokens
    DevOps & CloudAuto-check passed

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    1.3k GitHub starsUsed in 1 repo~1k tokens
    Testing & QAAuto-check passed

  • Next Upgrade

    vercel-labs/openreview

    Official

    Upgrade Next.js to the latest version following official migration guides and codemods

    1.7k GitHub starsUsed in 6 repos~502 tokens
    DevelopmentAuto-check passed

  • Check Deps Sync

    Hyk260/PureChat

    Check if package.json files are in sync with pnpm-lock.yaml.

    546 GitHub stars~594 tokensUpdated 22 days ago
    DevOps & CloudAuto-check passed

  • Bun

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    A skill your agent uses when building, running, testing, or bundling JavaScript/TypeScript applications.

    237 GitHub stars~2k tokensUpdated 1 mo ago
    Testing & QAAuto-check: notes

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Works with

Questions about Bun Runtime

What does Bun Runtime do?

Bun 作为运行时、包管理器、打包器和测试运行器。何时选择 Bun 而非 Node、迁移注意事项以及 Vercel 支持。. Bun Runtime is an agent skill from affaan-m/ECC.

How do I install Bun Runtime in Claude Code?

Run `npx skills add affaan-m/ECC --skill bun-runtime -a claude-code`. Or copy the skill folder (docs/zh-CN/skills/bun-runtime in affaan-m/ECC) into .claude/skills/bun-runtime in your project. Claude Code loads it when a task matches its description.

How do I install Bun Runtime in Codex?

Run `npx skills add affaan-m/ECC --skill bun-runtime -a codex`. Or copy the skill folder (docs/zh-CN/skills/bun-runtime in affaan-m/ECC) into .agents/skills/bun-runtime in your project. Codex loads it when a task matches its description.

Can I use Bun Runtime 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 affaan-m/ECC --skill bun-runtime -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-runtime, .gemini/skills/bun-runtime, .github/skills/bun-runtime and .opencode/skills/bun-runtime in your project.

What does Bun Runtime need to run?

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

Does Bun Runtime access the network?

SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Bun Runtime safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Bun Runtime use?

Bun Runtime is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Bun Runtime use?

About 443 tokens (SKILL.md is roughly 1.8k 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 Runtime?

Skills that share tags, products or a category with Bun Runtime: Bun Runtime (spinspire/pocketbase-sveltekit-starter, 511 stars), Vercel Deploy (bytedance/deer-flow, 84k stars), Before and After Screenshots (michaelshimeles/skills, 1.3k stars) and Next Upgrade (vercel-labs/openreview, 1.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Bun Runtime?

affaan-m (a GitHub user) maintains it in affaan-m/ECC, which has 275,546 GitHub stars. The repository holds 673 skills in this directory. The repository was last updated on October 5, 2026.

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