Agent skill

Bun Win32

by involvex in involvex/youtube-music-cli

Win32 FFI binding lifecycle for @bun-win32/ packages (Win32 DLL bindings via bun:ffi on Windows).

Install Bun Win32

skills CLI

$ npx skills add involvex/youtube-music-cli --skill bun-win32 -a claude-code

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

GitHub CLI

$ gh skill install involvex/youtube-music-cli bun-win32 --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/involvex/youtube-music-cli.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/bun-win32 .claude/skills/bun-win32 && 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-win32" agent skill from https://github.com/involvex/youtube-music-cli/tree/main/.agents/skills/bun-win32 into .claude/skills/bun-win32/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-win32", 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/involvex/youtube-music-cli/tree/main/.agents/skills/bun-win32

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 involvex/youtube-music-cli --skill bun-win32 -a codex

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

GitHub CLI

$ gh skill install involvex/youtube-music-cli bun-win32 --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/involvex/youtube-music-cli.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/bun-win32 .agents/skills/bun-win32 && 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-win32" agent skill from https://github.com/involvex/youtube-music-cli/tree/main/.agents/skills/bun-win32 into .agents/skills/bun-win32/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-win32", 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 involvex/youtube-music-cli --skill bun-win32 -a cursor

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

GitHub CLI

$ gh skill install involvex/youtube-music-cli bun-win32 --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/involvex/youtube-music-cli.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/bun-win32 .cursor/skills/bun-win32 && 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-win32" agent skill from https://github.com/involvex/youtube-music-cli/tree/main/.agents/skills/bun-win32 into .cursor/skills/bun-win32/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-win32", 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/involvex/youtube-music-cli.git --path .agents/skills/bun-win32

--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 involvex/youtube-music-cli --skill bun-win32 -a gemini-cli

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

GitHub CLI

$ gh skill install involvex/youtube-music-cli bun-win32 --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/involvex/youtube-music-cli.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/bun-win32 .gemini/skills/bun-win32 && 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-win32" agent skill from https://github.com/involvex/youtube-music-cli/tree/main/.agents/skills/bun-win32 into .gemini/skills/bun-win32/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-win32", 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 involvex/youtube-music-cli bun-win32

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 involvex/youtube-music-cli --skill bun-win32 -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/involvex/youtube-music-cli.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/bun-win32 .github/skills/bun-win32 && 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-win32" agent skill from https://github.com/involvex/youtube-music-cli/tree/main/.agents/skills/bun-win32 into .github/skills/bun-win32/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-win32", 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 involvex/youtube-music-cli --skill bun-win32 -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 involvex/youtube-music-cli bun-win32 --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/involvex/youtube-music-cli.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/bun-win32 .opencode/skills/bun-win32 && 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-win32" agent skill from https://github.com/involvex/youtube-music-cli/tree/main/.agents/skills/bun-win32 into .opencode/skills/bun-win32/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-win32", 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-win32
GitHub stars: 456
Token cost: ~1.1k tokens
SKILL.md length: 240 words
Files: 13 (incl. scripts, references)
Skills in repo: 6
Repo updated: Oct 8, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Win32 FFI binding lifecycle for @bun-win32/ packages (Win32 DLL bindings via bun:ffi on Windows).

Generating a new package from a DLL
SKILL.md covers Repository Context, Lifecycle Commands (run from…, Release and Scripts Reference, plus 3 more sections
Runs TypeScript scripts from its folder; calls bun and bunx
Auditing FFI↔TS↔header consistency

What it does

Bun Win32 is an agent skill from involvex/youtube-music-cli. Win32 FFI binding lifecycle for @bun-win32/ packages (Win32 DLL bindings via bun:ffi on Windows). Use when generating a new package from a DLL, auditing FFI↔TS↔header consistency, fixing nullability (| NULL / | 0n), or understanding the bootstrap→catalog→stub→audit→nullcheck pipeline. Covers 117 packages; strict TypeScript; Bun runtime; Biome formatting.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 14 other files, including scripts and reference files (for example `references/agents.md`, `references/ai-all.md` and `references/ai-core.md`).

It sits in Frontend & Design. It works with Windows, TypeScript, Bun and YouTube. The repository describes itself as: A powerful Terminal User Interface (TUI) music player for YouTube Music. The licence is MIT.

When your agent uses it

Generating a new package from a DLL
Auditing FFI↔TS↔header consistency
Fixing nullability (| NULL / | 0n)
Understanding the bootstrap→catalog→stub→audit→nullcheck pipeline

Example prompts

“/bun-win32”

Requirements

Node.js

What it can do on your machine

Read from SKILL.md and the folder at commit d4c5809. 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
Ships 9 files in scripts/ (TypeScript), which the agent can run.
Shell commands in SKILL.md call:
- bun
- bunx
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use bunx, 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 Win32 loads about 1.1k tokens when it runs, and up to ~6.5k if it reads all its reference files. Until then it costs about 92 tokens; SKILL.md has 240 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~92
When it runs · the whole SKILL.md, loaded when a task matches: ~1.1k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~6.5k

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); the scripts in this folder are not scanned.

SKILL.md

The full file from involvex/youtube-music-cli at commit d4c5809, republished under its MIT licence (© involvex). 240 words, ~1,096 tokens.

Download SKILL.mdSave it as .claude/skills/bun-win32/SKILL.md (or your agent's skills folder). This skill also uses 12 other files; get the full folder from GitHub.

name: bun-win32
description: Win32 FFI binding lifecycle for @bun-win32/* packages (Win32 DLL bindings via bun:ffi on Windows). Use when generating a new package from a DLL, auditing FFI↔TS↔header consistency, fixing nullability (| NULL / | 0n), or understanding the bootstrap→catalog→stub→audit→nullcheck pipeline. Covers 117 packages; strict TypeScript; Bun runtime; Biome formatting.
engines: opencode

bun-win32 Skill

Win32 FFI binding development lifecycle for the bun-win32 monorepo.

Repository Context

WORKING_DIR (repo root = ../.. from this skill directory)
  packages/       117 @bun-win32/* binding packages
  scripts/        repo automation scripts
  PROMPT.md       authoritative playbook (FFI rules, nullability, audits)
  AGENTS.md       operating rules — read before touching bindings

This skill dir: skill/bun-win32/
  SKILL.md        ← you are here
  scripts/        automation scripts (run from WORKING_DIR)
  references/     AGENTS.md, ai-core.md, ai-all.md

WORKING_DIR is the repo root. All commands run from there. Scripts in scripts/ use ROOT = join(import.meta.dir, '../..') so they resolve correctly when executed from this skill directory.

Lifecycle Commands (run from WORKING_DIR)

bash

# 1. Check prerequisites (platform Windows, Bun ≥1.3.0, ripgrep, SDK, dumpbin)
bun run skill/bun-win32/scripts/doctor.ts

# 2. Full pipeline: doctor → scaffold → install → catalog → ffi-runtime → stub
bun run skill/bun-win32/scripts/bootstrap.ts {name} [--class=ClassName] [--rg=<path>] [--dll=<path>]

# 3. Individual steps
bun run skill/bun-win32/scripts/catalog.ts {name} --json        # DLL∩SDK symbols
bun run skill/bun-win32/scripts/ffi-runtime.ts {name}            # FFI return shapes
bun run skill/bun-win32/scripts/stub.ts {name} [--class=C]      # paste-ready stubs

# 4. Auditing (run after writing bindings)
bun run skill/bun-win32/scripts/audit.ts {name}        # FFI↔TS↔header consistency (--all, --fix)
bun run skill/bun-win32/scripts/nullcheck.ts {name}    # SAL nullability (--all, --fix, --strict)
bunx tsc --noEmit                                      # type-check the package

Release

bash

rm bun.lock && bun install
bun run skill/bun-win32/scripts/preflight.ts
bun run skill/bun-win32/scripts/nullcheck.ts --all && bun run skill/bun-win32/scripts/audit.ts --all
cd packages/{name} && bun publish --access public --otp <code>

Scripts Reference

Script	What it does
`scripts/doctor.ts`	Prerequisites checker
`scripts/bootstrap.ts`	Orchestrated full pipeline
`scripts/catalog.ts`	dumpbin exports ∩ SDK headers → JSON
`scripts/scaffold.ts`	Template → package skeleton
`scripts/ffi-runtime.ts`	Probe FFI return-value shapes
`scripts/stub.ts`	catalog JSON → Symbols + method stubs
`scripts/audit.ts`	FFI↔TS↔header consistency auditor
`scripts/nullcheck.ts`	SAL-driven nullability auditor
`scripts/preflight.ts`	Lockfile staleness gate

FFI Type Quick Reference

Win32 type	FFI	TS
`HANDLE`, `HWND`, `HKEY`, `HMODULE`…	`FFIType.u64`	`bigint`
`SIZE_T`, `*_PTR`, `LPARAM`, `LRESULT`, `WPARAM`	`FFIType.u64`	`bigint`
`LARGE_INTEGER`, `ULARGE_INTEGER`	`FFIType.i64` / `u64`	`bigint`
`DWORD`, `UINT`, `BOOL`, `HRESULT`, `INT`, `LONG`, `WORD`, `BYTE`	`FFIType.u32` / `i32`	`number`
`LPVOID`, `LPCWSTR`, `LPSTR`, `LPDWORD`, `LPBYTE`…	`FFIType.ptr`	`Pointer`
`void`	`FFIType.void`	`void`

Decision rule: Does the caller pass .ptr from a Buffer/TypedArray they allocated? Yes → ptr. No → u64.

NULL: u64 → 0n, ptr → null, u32 → 0.

Key Files

references/agents.md — full AGENTS.md (binding rules, toolchain, FFI rules, prohibitions)
references/ai-core.md — @bun-win32/core contract (Win32 base class, .ptr extension, types)
references/ai-all.md — @bun-win32/all contract (re-export aggregator, when to use)
PROMPT.md at WORKING_DIR — deep playbook for FFI mapping, nullability, audits

Prohibited

Bind exports not confirmed by dumpbin //EXPORTS
Guess types/nullability — always verify vs SDK header + MS Learn
Use as any / forced casts — fix the FFI mapping instead
Reformat untouched files
Ship without running audit.ts --all and nullcheck.ts --all (zero findings required)

Files

SKILL.md and 12 other files (scripts, references) in .agents/skills/bun-win32 of involvex/youtube-music-cli.

SKILL.md
references/agents.md
references/ai-all.md
references/ai-core.md
scripts/audit.ts
scripts/bootstrap.ts
scripts/catalog.ts
scripts/doctor.ts
scripts/ffi-runtime.ts
scripts/nullcheck.ts
scripts/preflight.ts
scripts/scaffold.ts
scripts/stub.ts

Open the folder on GitHubat commit d4c5809

Compare with similar skills

Bun Win32 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 Win32 compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Bun Win32 this skillinvolvex/youtube-music-cli	456	—	~1.1k	Automated safety check: Pass	MIT	today
OpenTUI Terminal Interfacescline/cline	70k	—	~1.9k	Automated safety check: Pass	Apache-2.0	today
holaOS App Builder SDKholaboss-ai/holaOS	11k	—	~11k	Automated safety check: Pass	Custom licence	1 mo ago
Web Artifacts Builderanthropics/skills	180k	41 repos	~769	Automated safety check: Pass	Apache-2.0	3 days ago
URL to Markdown FetcherJimLiu/baoyu-skills	26k	2 repos	~2.1k	Automated safety check: Pass	MIT	28 days ago
Bun DevelopmentGabrielMartinMoran/mind	148	12 repos	~3.5k	Automated safety check: Notes	MIT	8 days ago

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Questions about Bun Win32

What does Bun Win32 do?

Win32 FFI binding lifecycle for @bun-win32/ packages (Win32 DLL bindings via bun:ffi on Windows). Bun Win32 is an agent skill from involvex/youtube-music-cli. Win32 FFI binding lifecycle for @bun-win32/ packages (Win32 DLL bindings via bun:ffi on Windows).

When should I use Bun Win32?

Bun Win32 fits situations like: generating a new package from a DLL; auditing FFI↔TS↔header consistency; fixing nullability (| NULL / | 0n); understanding the bootstrap→catalog→stub→audit→nullcheck pipeline.

How do I install Bun Win32 in Claude Code?

Run `npx skills add involvex/youtube-music-cli --skill bun-win32 -a claude-code`. Or copy the skill folder (.agents/skills/bun-win32 in involvex/youtube-music-cli) into .claude/skills/bun-win32 in your project. Claude Code loads it when a task matches its description.

How do I install Bun Win32 in Codex?

Run `npx skills add involvex/youtube-music-cli --skill bun-win32 -a codex`. Or copy the skill folder (.agents/skills/bun-win32 in involvex/youtube-music-cli) into .agents/skills/bun-win32 in your project. Codex loads it when a task matches its description.

Can I use Bun Win32 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 involvex/youtube-music-cli --skill bun-win32 -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-win32, .gemini/skills/bun-win32, .github/skills/bun-win32 and .opencode/skills/bun-win32 in your project.

What does Bun Win32 need to run?

Going by SKILL.md and its folder, Bun Win32 needs TypeScript for the scripts in its folder and the command-line tools its instructions call (bun and bunx). Our summary lists: Node.js.

Does Bun Win32 access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Bun Win32 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Bun Win32 use?

Bun Win32 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 Win32 use?

About 1.1k tokens (SKILL.md is roughly 4.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 5.5k tokens, read only when the agent opens those files.

What are the alternatives to Bun Win32?

Skills that share tags, products or a category with Bun Win32: OpenTUI Terminal Interfaces (cline/cline, 70k stars), holaOS App Builder SDK (holaboss-ai/holaOS, 11k stars), Web Artifacts Builder (anthropics/skills, 180k stars) and URL to Markdown Fetcher (JimLiu/baoyu-skills, 26k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Bun Win32?

involvex (a GitHub user) maintains it in involvex/youtube-music-cli, which has 456 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on October 8, 2026.

Source: involvex/youtube-music-cli on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Bun Win32

Install Bun Win32

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

bun-win32 Skill

Repository Context

Lifecycle Commands (run from WORKING_DIR)

Release

Scripts Reference

FFI Type Quick Reference

Key Files

Prohibited

Files

Compare with similar skills

Similar skills

OpenTUI Terminal Interfaces

holaOS App Builder SDK

Web Artifacts Builder

URL to Markdown Fetcher

Bun Development

Ink Tui Wizard

More from involvex/youtube-music-cli

React State Management

Bun Build

Bun Dev Server

Bun Test

Bun Init

Questions about Bun Win32

Install Bun Win32

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

bun-win32 Skill

Repository Context

Lifecycle Commands (run from WORKING_DIR)

Release

Scripts Reference

FFI Type Quick Reference

Key Files

Prohibited

Files

Compare with similar skills

Similar skills

More from involvex/youtube-music-cli

Related

Questions about Bun Win32