bun

bun is a command for Claude Code from MadAppGang/magus. It costs 32 tokens per session (389 once invoked), scanned A, original, MIT.

A routing command for Bun and TypeScript work. Bun is a JavaScript and TypeScript runtime, and the command selects only the relevant guidance for a task.

In plain words
What is it for?
Use it when starting or changing a Bun/TypeScript project, including setup, HTTP services, errors, performance, security, or testing.
Why use it?
It avoids loading every available guide and helps match the work to the right development area.

Command for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the bunjs plugin — 9 skills, 9 commands shipped together

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.

agentmods
npx agentmods add commands/madappgang/magus/bun
Clone the repo
git clone --depth 1 https://github.com/MadAppGang/magus

Made for: Claude Code.

Or install bunjs, the plugin that ships this one along with the rest of its 9 skills, 9 commands.

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/commands/madappgang/magus/bun.svg)](https://agentmods.dev/commands/madappgang/magus/bun)
Your own site
<a href="https://agentmods.dev/commands/madappgang/magus/bun"><img src="https://agentmods.dev/badge/commands/madappgang/magus/bun.svg" alt="Measured on agentmods" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 389 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00032 $0.00389
Opus 5 $0.00016 $0.00195
Sonnet 5 $0.00006 $0.00078
Haiku 4.5 $0.00003 $0.00039

Measured 6d ago against content hash e4918fd438d4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, 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 6d 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.

plugins/bunjs/commands/bun.md · 29 lines

What it actually says

<user_request>$ARGUMENTS</user_request>

  1. Read skills/bun/SKILL.md — resolved against this plugin's own directory (the tree this command was loaded from). It is the index: eight skills, what each is for, and the routing table for common tasks.

  2. Pick the one or two the request actually needs, and read only those. Match on what the task will make you write, not on the words used — "add login" is security, "it's slow" is performance. Chains stop where the task stops: a fresh app is project-setuphttp-serviceerrors; testing waits until there is something to test, production until it is being shipped. Reading all eight is ~4,000 lines and defeats the point of the index.

  3. Copy the shipped assets/ rather than retyping them. Six of the eight ship tested code and each names its exact cp line. Retyped versions silently lose the parts that matter — the enumeration-timing burn, full-jitter backoff, the cycle-safe cause walk.

  4. Before reporting done: satisfy the Acceptance section of every skill you read. bun test and tsc --noEmit are the floor in all eight — bun run strips types without checking them, so a type error never surfaces at runtime.

If the request is not Bun or TypeScript, say so and stop rather than guessing from these skills.

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. 6d ago First seen · 29 lines · 32 tokens per session scan A e4918fd438d4

Subscribe to this mod's changes

bun is a command published in the GitHub repository MadAppGang/magus (9 stars, last pushed 2d ago), licensed MIT. It adds 32 tokens to every session and 389 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.