Project Pull Request
swimmwatch/cloakbrowser-mcp
Create, update, prepare, or review a cloakbrowser-mcp GitHub Pull Request only when the user explicitly requests PR work.
Points the agent at Bun 1.4 built-in APIs before it installs an npm package, so image, browser, markdown, cron, PTY and test work uses what Bun already ships.
Install Bun 1.4 Builtins Guide
$ npx skills add code-yeongyu/senpi --skill bun-1-4 -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install code-yeongyu/senpi bun-1-4 --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/code-yeongyu/senpi.git skills-src && mkdir -p .claude/skills && cp -r skills-src/packages/senpi-codemode/src/skill/bun-1-4 .claude/skills/bun-1-4 && rm -rf skills-srcUse ~/.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/
Install the "bun-1-4" agent skill from https://github.com/code-yeongyu/senpi/tree/main/packages/senpi-codemode/src/skill/bun-1-4 into .claude/skills/bun-1-4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-1-4", 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 install https://github.com/code-yeongyu/senpi/tree/main/packages/senpi-codemode/src/skill/bun-1-4Type 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.
$ npx skills add code-yeongyu/senpi --skill bun-1-4 -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install code-yeongyu/senpi bun-1-4 --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/code-yeongyu/senpi.git skills-src && mkdir -p .agents/skills && cp -r skills-src/packages/senpi-codemode/src/skill/bun-1-4 .agents/skills/bun-1-4 && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "bun-1-4" agent skill from https://github.com/code-yeongyu/senpi/tree/main/packages/senpi-codemode/src/skill/bun-1-4 into .agents/skills/bun-1-4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-1-4", 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.
$ npx skills add code-yeongyu/senpi --skill bun-1-4 -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install code-yeongyu/senpi bun-1-4 --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/code-yeongyu/senpi.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/packages/senpi-codemode/src/skill/bun-1-4 .cursor/skills/bun-1-4 && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "bun-1-4" agent skill from https://github.com/code-yeongyu/senpi/tree/main/packages/senpi-codemode/src/skill/bun-1-4 into .cursor/skills/bun-1-4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-1-4", 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 https://github.com/code-yeongyu/senpi.git --path packages/senpi-codemode/src/skill/bun-1-4--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add code-yeongyu/senpi --skill bun-1-4 -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install code-yeongyu/senpi bun-1-4 --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/code-yeongyu/senpi.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/packages/senpi-codemode/src/skill/bun-1-4 .gemini/skills/bun-1-4 && rm -rf skills-srcUse ~/.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/
Install the "bun-1-4" agent skill from https://github.com/code-yeongyu/senpi/tree/main/packages/senpi-codemode/src/skill/bun-1-4 into .gemini/skills/bun-1-4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-1-4", 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.
$ gh skill install code-yeongyu/senpi bun-1-4Installs 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).
$ npx skills add code-yeongyu/senpi --skill bun-1-4 -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/code-yeongyu/senpi.git skills-src && mkdir -p .github/skills && cp -r skills-src/packages/senpi-codemode/src/skill/bun-1-4 .github/skills/bun-1-4 && rm -rf skills-srcUse ~/.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/
Install the "bun-1-4" agent skill from https://github.com/code-yeongyu/senpi/tree/main/packages/senpi-codemode/src/skill/bun-1-4 into .github/skills/bun-1-4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-1-4", 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.
$ npx skills add code-yeongyu/senpi --skill bun-1-4 -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install code-yeongyu/senpi bun-1-4 --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/code-yeongyu/senpi.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/packages/senpi-codemode/src/skill/bun-1-4 .opencode/skills/bun-1-4 && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "bun-1-4" agent skill from https://github.com/code-yeongyu/senpi/tree/main/packages/senpi-codemode/src/skill/bun-1-4 into .opencode/skills/bun-1-4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "bun-1-4", 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-1-4- GitHub stars
- 470
- Token cost
- ~1.3k tokens
- SKILL.md length
- 530 words
- Files
- 11 (incl. references)
- Skills in repo
- 7
- Repo updated
- First seen
- Licence
- MIT
At a glance
Points the agent at Bun 1.4 built-in APIs before it installs an npm package, so image, browser, markdown, cron, PTY and test work uses what Bun already ships.
- Works in 5 steps: Eval-first. The eval js kernel runs on… → Builtin-first. The Replaces column above… → Read the matching reference before using… → …
- Before installing sharp, puppeteer, marked or node-cron for a task in Bun
- SKILL.md covers Capability map — what you can… and Operating rules
- Calls bun
What it does
Written for sessions whose eval js kernel runs Bun 1.4 or later, this skill holds a capability map of builtins that stand in for utility npm packages. Examples are Bun.file().image() for sharp, Bun.WebView for puppeteer or playwright scraping, Bun.markdown for marked, Bun.cron for node-cron, Bun.spawn with a terminal option for node-pty and Bun.stringWidth for string-width. The agent consults the map before adding a dependency or writing a workaround.
It also covers static file serving through Bun.serve routes, HTTP/3, bun test flags for parallel runs, shards, changed files, retries and isolation, and bun build options such as --react-compiler and --compile --asset. Reference files handle breaking changes, build, install, security, tests, runtime APIs and more. When the Bun version is unknown, the skill says to confirm it with bun --version first.
When your agent uses it
- Before installing sharp, puppeteer, marked or node-cron for a task in Bun
- Running tests in parallel or in CI shards with bun test
- Resizing images or rendering Markdown without extra dependencies
- Spawning a PTY or a static file server from a JavaScript eval cell
Example prompts
- “Resize every PNG in ./assets to webp using whatever Bun already provides.”
- “I need a nightly job in this script, so see whether Bun has a built-in before adding node-cron.”
- “Split our test suite across three CI shards with bun test.”
Requirements
- Bun 1.4 or later
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Eval-first. The eval js kernel runs on Bun (that is why this skill is present): call Bun.* APIs directly inside js cells. Reach for bash…
- Builtin-first. The Replaces column above is a ban list for new dependencies, in production code, test helpers, and one-off scripts alike.
- Read the matching reference before using an unfamiliar API — signatures and caveats (e.g. Bun.markdown HTML is unsanitized, HTTP/3 is…
- Upgrading a project to 1.4 or debugging behavior that changed? Read breaking-changes first — YAML/TOML strictness, .xml/.css import…
- TLS errors after upgrade are usually intentional — 1.4 tightened certificate verification across fetch, tls.connect, Bun.connect…
What it can do on your machine
Read from SKILL.md and the folder at commit 0fa9139. 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
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 1.4 Builtins Guide loads about 1.3k tokens when it runs, and up to ~12k if it reads all its reference files. Until then it costs about 159 tokens; SKILL.md has 530 words of instructions outside code blocks.
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
The full file from code-yeongyu/senpi at commit 0fa9139, republished under its MIT licence (© code-yeongyu). 530 words, ~1,316 tokens.
Download SKILL.mdSave it as
.claude/skills/bun-1-4/SKILL.md (or your agent's skills folder). This skill also uses 10 other files; get the full folder from GitHub.- name
- bun-1-4
- description
- Read before a js eval cell that installs a package, spawns a server or PTY, or starts a long run, and before any bun -e, script, server, CLI, test, bundle, or package-management work: this session's eval js kernel runs Bun 1.4+ (this skill is present only when it does). Bun 1.4 ships builtins that replace 15+ npm deps — check here BEFORE installing sharp, puppeteer/playwright (scraping), marked, node-cron, node-pty, concurrently, serve-static, tar, json5, fast-xml-parser, string-width. Triggers: eval js, bun, Bun.serve, bun test, bun build, bun install, bun run, image resize, headless browser, markdown render, cron, PTY.
Bun 1.4 — Use the Builtins First
Bun 1.4 (2026) ships builtins that replace most utility npm packages. Before adding a dependency or writing a workaround, check the capability map below — if Bun ships it, use the builtin. This skill is loaded because this session's eval js kernel runs Bun >= 1.4; on other machines or pinned projects, confirm with bun --version ([v1.3.x]/[v1.4.0] tags in the references give exact minimums). Release post: https://bun.com/blog/bun-v1.4
Capability map — what you can do now
| You want to... | Use | Replaces | Ref = references/<name>.md |
|---|---|---|---|
| Resize/convert/rotate images | Bun.file(p).image().resize().webp().write() | sharp | runtime-apis |
| Headless browser: navigate, click, screenshot, evaluate, CDP | new Bun.WebView() | puppeteer, playwright (scraping) | runtime-apis |
| Markdown → HTML / React / ANSI | Bun.markdown.html() / .react() / .render() | marked, react-markdown | runtime-apis |
| Schedule cron jobs | Bun.cron() | node-cron | runtime-apis |
| Drive a PTY (bash, vim, TUIs) from JS | Bun.spawn([...], { terminal }) | node-pty | runtime-apis |
| Run package scripts concurrently, glob-matched | bun run --parallel "build:*" | concurrently, npm-run-all | runtime-apis |
| Parse JSON5 / JSONL / JSONC / XML / TOML; tarballs | Bun.JSON5/.JSONL/.JSONC/.XML/.TOML, Bun.Archive | json5, ndjson, jsonc-parser, fast-xml-parser, @iarna/toml, tar | runtime-apis |
| ANSI-aware terminal text: width, slice, wrap | Bun.stringWidth(), Bun.sliceAnsi(), Bun.wrapAnsi() | string-width, slice-ansi, wrap-ansi | runtime-apis |
| Call C libraries 3x faster, plain strings back | bun:ffi (buffer_length, cstring) | — | runtime-apis |
| Serve a static dir (ETag/Range/304 handled) | Bun.serve({ routes: { "/x/*": { dir } } }) | express.static, serve-static, sirv | http-networking |
HTTP/3 server; fetch protocol/compress/proxy | http3: true, fetch(url, { protocol, compress, proxy }) | — | http-networking |
| Tests across CPU workers / CI shards / changed files / flaky retry | bun test --parallel --shard=1/3 --changed=main --retry | jest/vitest infra | test |
| Kill "passes alone, fails in suite" bugs | bun test --isolate | vitest default behavior | test |
| React Compiler auto-memoization | bun build --react-compiler | babel-plugin-react-compiler | build |
| Embed assets/dirs into a single-file executable | bun build --compile --asset ./public | pkg hacks | build |
| Compile-time feature flags, in-memory bundling, metafile | bun:bundle feature(), files:{}, metafile: true | esbuild define/plugins | build |
| Diff package versions, fix vulns, dedupe/prune, license audit | bun pm diff, bun audit fix, bun dedupe, bun prune, bun pm licenses | npm-diff, npm audit fix | install |
| 7x faster CI installs (global virtual store) | linker = "isolated" in bunfig.toml | pnpm store | install |
| Profile CPU/heap/bundle as grep-able Markdown | bun --cpu-prof-md, --heap-prof-md, bun build --metafile-md | Chrome DevTools round-trip | dev-tooling |
| Native REPL; render Markdown in terminal | bun repl, bun ./README.md | node repl, glow | runtime-apis |
| Run Playwright, vitest, Next.js 16, OpenTelemetry, dd-trace | they now just work | Node.js | node-compat-platforms |
Free wins (no code change): 2x lower CPU, 13-48% less server memory, 2-2.5x faster startup — full numbers in performance.
Show full SKILL.md (151 more words)Show less
Operating rules
- Eval-first. The
evaljs kernel runs on Bun (that is why this skill is present): callBun.*APIs directly inside js cells. Reach forbashor a spawnedbun <file>/bun -eonly for CLI surfaces (bun test,bun build,bun pm) or work that needs a separate process. - Builtin-first. The Replaces column above is a ban list for new dependencies, in production code, test helpers, and one-off scripts alike.
- Read the matching reference before using an unfamiliar API — signatures and caveats (e.g.
Bun.markdownHTML is unsanitized, HTTP/3 is experimental) live there, not here. - Upgrading a project to 1.4 or debugging behavior that changed? Read breaking-changes first — YAML/TOML strictness,
.xml/.cssimport semantics,Bun.$globbing, fetch header combining, and WebSocket close timing all changed. - TLS errors after upgrade are usually intentional — 1.4 tightened certificate verification across
fetch,tls.connect,Bun.connect,RedisClient. See security before loosening anything.
© code-yeongyu, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 10 other files (references) in packages/senpi-codemode/src/skill/bun-1-4 of code-yeongyu/senpi.
- SKILL.md
- references/breaking-changes.md
- references/build.md
- references/dev-tooling.md
- references/http-networking.md
- references/install.md
- references/node-compat-platforms.md
- references/performance.md
- references/runtime-apis.md
- references/security.md
- references/test.md
Open the folder on GitHubat commit 0fa9139
Compare with similar skills
Bun 1.4 Builtins Guide 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Bun 1.4 Builtins Guide this skillcode-yeongyu/senpi | 470 | — | ~1.3k | Automated safety check: Pass | MIT | |
| Project Pull Requestswimmwatch/cloakbrowser-mcp | 161 | — | ~1k | Automated safety check: Pass | MIT | |
| Bun Runtimespinspire/pocketbase-sveltekit-starter | 511 | 5 repos | ~653 | Automated safety check: Notes | MIT | |
| Monorepo Tooling and Dependenciespierrecomputer/pierre | 6.2k | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Bun Runtime and Toolkitmweinbach/agent-coworker | 156 | — | ~2.2k | Automated safety check: Notes | Custom licence | |
| Project Docs Maintainerswimmwatch/cloakbrowser-mcp | 161 | — | ~569 | Automated safety check: Pass | MIT |
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Sets one monorepo's rules for toolchain pins, pnpm package operations, the shared dependency catalog and moon tasks, so the agent adds versions and scripts the right way.
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Related
Works with
Categories
Questions about Bun 1.4 Builtins Guide
What does Bun 1.4 Builtins Guide do?
Points the agent at Bun 1.4 built-in APIs before it installs an npm package, so image, browser, markdown, cron, PTY and test work uses what Bun already ships. 4 or later, this skill holds a capability map of builtins that stand in for utility npm packages.stringWidth for string-width.
When should I use Bun 1.4 Builtins Guide?
Bun 1.4 Builtins Guide fits situations like: before installing sharp, puppeteer, marked or node-cron for a task in Bun; running tests in parallel or in CI shards with bun test; resizing images or rendering Markdown without extra dependencies; spawning a PTY or a static file server from a JavaScript eval cell.
How do I install Bun 1.4 Builtins Guide in Claude Code?
Run `npx skills add code-yeongyu/senpi --skill bun-1-4 -a claude-code`. Or copy the skill folder (packages/senpi-codemode/src/skill/bun-1-4 in code-yeongyu/senpi) into .claude/skills/bun-1-4 in your project. Claude Code loads it when a task matches its description.
How do I install Bun 1.4 Builtins Guide in Codex?
Run `npx skills add code-yeongyu/senpi --skill bun-1-4 -a codex`. Or copy the skill folder (packages/senpi-codemode/src/skill/bun-1-4 in code-yeongyu/senpi) into .agents/skills/bun-1-4 in your project. Codex loads it when a task matches its description.
Can I use Bun 1.4 Builtins Guide 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 code-yeongyu/senpi --skill bun-1-4 -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-1-4, .gemini/skills/bun-1-4, .github/skills/bun-1-4 and .opencode/skills/bun-1-4 in your project.
What does Bun 1.4 Builtins Guide need to run?
Going by SKILL.md and its folder, Bun 1.4 Builtins Guide needs the command-line tools its instructions call (bun). Our summary lists: Bun 1.4 or later.
Does Bun 1.4 Builtins Guide 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 1.4 Builtins Guide 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 1.4 Builtins Guide use?
Bun 1.4 Builtins Guide 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 1.4 Builtins Guide use?
About 1.3k tokens (SKILL.md is roughly 5.3k 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 10k tokens, read only when the agent opens those files.
What are the alternatives to Bun 1.4 Builtins Guide?
Skills that share tags, products or a category with Bun 1.4 Builtins Guide: Project Pull Request (swimmwatch/cloakbrowser-mcp, 161 stars), Bun Runtime (spinspire/pocketbase-sveltekit-starter, 511 stars), Monorepo Tooling and Dependencies (pierrecomputer/pierre, 6.2k stars) and Bun Runtime and Toolkit (mweinbach/agent-coworker, 156 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Bun 1.4 Builtins Guide?
code-yeongyu (a GitHub user) maintains it in code-yeongyu/senpi, which has 470 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on October 7, 2026.
Source: code-yeongyu/senpi on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.