Install

Pick the AI app you use, then copy the settings.

Passed 3/3 checks · Runs on your computer

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done
Paste these settings and save the file
Checking the commands · copy buttons appear once they pass
Done
Quit Claude and open it again
Done
Try it
Use Buildutilities MCP and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Buildutilities MCP or shows a Buildutilities MCP tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Buildutilities MCP yet

Buildutilities MCP runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect Buildutilities MCP

Steps for Claude →Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →Install Node.js on your computer first (one time)
Steps for Cursor →Install Node.js on your computer first (one time)
Steps for VS Code →Install Node.js on your computer first (one time)

B · Others in Developer tools that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Sentry✓ ChatGPT
Compiler Explorer✓ ChatGPT
GitDiagram✓ ChatGPT

Works with Claude Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done
Paste this command and press Enter
Checking the commands · copy buttons appear once they pass
Done
Type /mcp in Claude Code
You should see Buildutilities MCP listed as connected
Done
Try it
Use Buildutilities MCP and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Buildutilities MCP or shows a Buildutilities MCP tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open Cursor
Checking the commands · copy buttons appear once they pass
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Buildutilities MCP and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Buildutilities MCP or shows a Buildutilities MCP tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open VS Code
Checking the commands · copy buttons appear once they pass
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Buildutilities MCP and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Buildutilities MCP or shows a Buildutilities MCP tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use Buildutilities MCP💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

Checking the commands · copy buttons appear once they pass

Claude Desktop (claude_desktop_config.json)

Checking the commands · copy buttons appear once they pass

Cursor (~/.cursor/mcp.json)

Checking the commands · copy buttons appear once they pass

VS Code (mcp.json)

Checking the commands · copy buttons appear once they pass

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 13, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account brentspore, which owns the repo
✓ Pass
Still maintained
Code last changed 14 days ago
✓ Pass
Has a licence
Uses MIT
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

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User reviews

No reviews yet

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Compared with others in Developer toolsi

More stars than 0% of the other 5852 servers in this category
Published to the registry more recently than 64% of the other 5852 servers in this category
Basic checks equal to or better than 100% of the other 5852 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Buildutilities MCP safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed 14 days ago, and the latest version (0.1.3) reached the registry 14 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: REA, GitHub, Serena MCP: the IDE for your agent

Others in the same category

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

REA

Reverse engineer anything from your terminal or agent with one CLI and MCP server.

by morlutoWidely used↓ 388.7K/wk★ 455.4KUpdated yesterday

Runs on your computer

Install

GitHub

GitHub’s official server lets AI read and manage code, issues and pull requests in your account. Use GitHub’s hosted version or run it locally with Docker.

by githubWidely used★ 34.4KUpdated 10 days ago

Computer or cloud

Install

Serena MCP: the IDE for your agent

A powerful toolkit for coding, providing semantic retrieval and editing capabilities.

by oraiosWidely used↓ 35.2K/wk★ 31.3KUpdated 6 months ago

Runs on your computer

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

buildutilities-mcp

Deterministic developer utilities as MCP tools. Runs entirely on your machine — no network calls, no telemetry, no API key, no account.

From the people who make buildutilities.com.

Why these tools and not others

A language model is already good at most text manipulation, and a tool it does not need is a tool that only burns its context window. So this server deliberately covers the operations models are genuinely *bad* at:

Randomness. A model cannot generate it. Ask one for a UUID or a password and you get something drawn from its training distribution — repeatable between sessions, sometimes lifted verbatim from a public code sample. For anything security-adjacent that is a real defect.
Exact digests and bytes. It cannot compute a SHA-256, so it invents a plausible one. Base64 of anything it has not effectively memorised comes back quietly corrupted.
Running a regex. Asked whether a pattern matches, a model reasons *about* the pattern instead of executing it, so it reports matches that do not exist and misses ones that do.
Precise counting over long text, and calendar arithmetic across timezones and DST — including "when does this cron next fire", which models answer confidently and wrongly.

Everything here is a pure function: same arguments, same answer, no state, no side effects.

Install

Claude Code

claude mcp add buildutilities -- npx -y buildutilities-mcp

Claude Desktop, Cursor, or any client with a JSON config

"mcpServers": { "buildutilities": { "command": "npx", "args": ["-y", "buildutilities-mcp"] } } }

Requires Node 18 or newer. To see the tool list without an MCP client:

npx -y buildutilities-mcp --help

Tools

Randomness a model cannot fake

Tool	What it does
`generate_uuid`	Cryptographically random UUID v4s, via the OS CSPRNG.
`generate_password`	Random password, guaranteeing at least one character from every enabled set.
`generate_token`	Random token for API keys, session ids, nonces and salts — hex, base64url or alphanumeric.

Exact bytes and digests

Tool	What it does
`base64_encode`	Encode to Base64, standard or URL-safe.
`base64_decode`	Decode Base64, reporting invalid input rather than returning mojibake.
`url_encode`	Percent-encode, in component or full-URI mode.
`url_decode`	Decode percent-encoding, reporting malformed input.
`hash_text`	md5, sha1, sha256, sha384 or sha512 digest, with a warning on the broken ones.
`hmac_sign`	HMAC a message with a secret — webhook and request signing.
`hmac_verify`	Constant-time check of a message against an expected signature.

Calendar arithmetic

Tool	What it does
`convert_timestamp`	Unix epoch to human time in any IANA timezone; auto-detects seconds vs milliseconds.
`cron_next_runs`	Next run times for a 5-field cron expression, in a timezone.

Documents, tokens, diffs

Tool	What it does
`format_json`	Pretty-print or minify JSON exactly, with line and column on a parse error.
`decode_jwt`	Read a JWT's header, payload and expiry. Decodes only — never verifies.
`diff_text`	Line-by-line diff, marking what was added and removed.

Run it, do not predict it

Tool	What it does
`test_regex`	Actually execute a pattern and return every match with its index and capture groups.
`escape_regex`	Escape a string for use as a regex literal.
`analyze_text`	Exact character, word, line, sentence, paragraph and byte counts.
`slugify`	URL-safe slug, transliterating accents.
`check_color_contrast`	Exact WCAG 2.2 contrast ratio and which AA/AAA thresholds it passes.

What it does not do

It does not verify JWT signatures. decode_jwt reads a token; it cannot tell you the token is genuine. Never trust its output as authentication.
md5 and sha1 are included but not secure. They are there for checksums and legacy interop, and the tool says so in its output.
Cron is standard 5-field only. Non-standard syntax (L, W, #, ?) is refused rather than guessed at, because a plausible wrong schedule is worse than an error. Times inside a DST spring-forward gap are still listed; real cron implementations disagree about that case.

The no-network claim is tested

Three tests in test/no-network.test.ts enforce it, so it cannot quietly stop being true:

No source file imports node:net, http, https, dns, tls or dgram, or calls fetch.
Running every tool in the catalogue loads no network-related native binding.
The package declares exactly two runtime dependencies (the MCP SDK and zod); adding a third fails the suite and forces a re-check.

npm test    # 48 tests

Licence

MIT

Buildutilities MCP

What it does

Install

Install Node.js

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Developer toolsi

Common questions

Others in the same category

REA

GitHub

Serena MCP: the IDE for your agent

README from the maker

buildutilities-mcp

Why these tools and not others

Install

Tools

What it does not do

The no-network claim is tested

Licence