bun

bun is a skill for Claude Code, Codex from itechmeat/llm-code. It costs 111 tokens per session (2,329 once invoked), scanned A, original, MIT.

A JavaScript and TypeScript runtime with built-in tools for installing packages, bundling code, running tests, serving HTTP, and working with files and databases. It is an alternative to using several separate tools.

In plain words
What is it for?
Use it to run JavaScript or TypeScript, manage packages, bundle applications, run tests, create servers, use SQLite, work with S3 or Redis, and write shell scripts.
Why use it?
It gives JavaScript and TypeScript projects one toolkit for common development tasks. This can reduce the number of separate commands and tools you need to configure.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to run JavaScript or TypeScript, manage packages, bundle applications, run tests, create servers, use SQLite, work with S3 or Redis, and write shell scripts.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/itechmeat/llm-code/bun
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 itechmeat/llm-code --skill bun
Clone the repo
git clone --depth 1 https://github.com/itechmeat/llm-code

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.

agentmods badge for bun

README.md
[![agentmods](https://agentmods.dev/badge/skills/itechmeat/llm-code/bun/github.svg)](https://agentmods.dev/skills/itechmeat/llm-code/bun)
Your own site
<a href="https://agentmods.dev/skills/itechmeat/llm-code/bun"><img src="https://agentmods.dev/badge/skills/itechmeat/llm-code/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.

agentmods 80×15 button for bun

Your own site · 80×15
<a href="https://agentmods.dev/skills/itechmeat/llm-code/bun"><img src="https://agentmods.dev/badge/skills/itechmeat/llm-code/bun.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 111 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,329 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 2 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Privilege Escalation · line 254
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
How audits are shown
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00111 $0.02329
Opus 5.5 $0.00044 $0.00932
Sonnet 5.5 $0.00022 $0.00466
Haiku 4.5 $0.00011 $0.00233

Measured 24d ago against content hash 91056c95f157, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bun scanned grade A with 2 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 24d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

fetch(req) {

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

| `child_process.exec()` | `Bun.$` or `Bun.spawn()` |
skills/bun/SKILL.md · 271 lines

How it starts

The opening of the file, as written. The whole thing — 271 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Bun

All-in-one JavaScript/TypeScript toolkit: runtime, package manager, test runner, bundler.

Quick Navigation

Topic Reference
Package Manager references/package-manager.md
Project Setup references/project-scaffolding.md
Development references/development.md
Module System references/module-system.md
TypeScript & JSX references/typescript-jsx.md
Configuration references/bunfig.md
HTTP Server references/http-server.md
Browser Automation references/webview.md
WebSockets references/websockets.md
File I/O references/file-io.md
SQLite references/sqlite.md
S3 Storage references/s3.md
Redis references/redis.md
Low-Level Network references/networking-low-level.md
Fetch API references/fetch.md
Shell Scripts references/shell.md
Spawn Process references/spawn.md
Workers references/workers.md
Native FFI references/native-interop.md
C/C++ Compile references/cc.md
Transpiler references/transpiler.md
Plugins references/plugins.md
FS Router references/file-system-router.md
Environment Vars references/env.md
Utilities references/utilities.md
Node.js Compat references/nodejs-compat.md

When to Use Bun

  • Running TypeScript/JSX without build step
  • Fast HTTP server with native routing
  • Headless browser automation with native input events
  • SQLite database (embedded, no deps)
  • WebSocket server/client
  • S3-compatible storage (AWS, R2, MinIO)
  • Redis caching/pub-sub
  • Cross-platform shell scripts
  • In-process cron scheduling
  • Markdown parsing (v1.3.8+)
  • Native library calls via FFI

Read the full file on GitHub · 271 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.

  1. 24d ago Changed 91056c95f157
  2. 1mo ago Changed · +11 lines 2240cc663216
  3. 1mo ago First seen · 260 lines · 111 tokens per session scan A 00d9cb24a048

Subscribe to this mod's changes

bun is a skill published in the GitHub repository itechmeat/llm-code (24 stars, last pushed 24d ago), licensed MIT. It adds 111 tokens to every session and 2,329 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 2 findings (makes network calls, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

Other skills, from other repositories

adapter-express

Mount tRPC as Express middleware with createExpressMiddleware() from @trpc/server/adapters/express. Access Express req/res in createContext via CreateExpressContextOptions. Mount at a path prefix like app.use('/trpc', ...). Avoid global express.json() conflicting with tRPC body parsing for FormData.

trpc/trpc · 67 tokens

trpc-router

Entry point for all tRPC skills. Decision tree routing by task: initTRPC.create(), t.router(), t.procedure, createTRPCClient, adapters, subscriptions, React Query, Next.js, links, middleware, validators, error handling, caching, FormData.

trpc/trpc · 59 tokens

stripe-projects

Use after E2B sandbox/API access has been provisioned through Stripe Projects and the user needs to use the resulting E2B API key with the E2B CLI, JavaScript SDK, Python SDK, or Code Interpreter SDK.

e2b-dev/E2B · 51 tokens

nestjs-expert

Creates and configures NestJS modules, controllers, services, DTOs, guards, and interceptors for enterprise-grade TypeScript backend applications. Use when building NestJS REST APIs or GraphQL services, implementing dependency injection, scaffolding modular architecture, adding JWT/Passport authentication, integrating…

Jeffallan/claude-skills · 107 tokens

chat-sdk

Build multi-platform chat bots with Chat SDK (chat npm package). Use when developers want to (1) Build a Slack, Teams, Google Chat, Discord, Telegram, GitHub, Linear, or WhatsApp bot, (2) Use Chat SDK to handle mentions, direct messages, subscribed threads, reactions, slash commands, cards, modals, files, or AI…

vercel-labs/open-agents · 191 tokens

azure-web-pubsub-ts

Build real-time messaging applications using Azure Web PubSub SDKs for JavaScript (@azure/web-pubsub, @azure/web-pubsub-client). Use when implementing WebSocket-based real-time features, pub/sub me...

benjaminasterA/antigravity-awesome-skills · 51 tokens