Spec Driven Development
by formulahendry
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer★ 440MITUpdated 14 months ago
Install
BoringToolsKit
Overview
Description from the maker (original English)
36 free private calculator tools for Claude. No accounts, no data leaves your session.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs in the cloud
- Transport: Streamable HTTP
- Category: Other
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on the maker’s server: what you ask it goes through their server.
- The registry lists no key to fill in.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://boringtoolskit.com/mcpRun this in your terminal
claude mcp add --transport http boringtoolskit https://boringtoolskit.com/mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"boringtoolskit": {
"url": "https://boringtoolskit.com/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"boringtoolskit": {
"type": "http",
"url": "https://boringtoolskit.com/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://boringtoolskit.com/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
We have not read this server’s tool list yet; we check endpoints in rotation.
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 7, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account roadtogideon222-byte, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- … Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
- … Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Compared with others in Otheri
- More stars than 0% of the other 32725 servers in this category
- Published to the registry more recently than 62% of the other 32725 servers in this category
- Basic checks equal to or better than 100% of the other 32725 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 BoringToolsKit safe?
It passed 1 of 1 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 in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 24 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, Signoff
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Remote Desktop Commander
by desktop-commander
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Runs in the cloud★ 211Updated 2 days ago
Install
Signoff
by ayuanxx-max
Five gates that make an agent's 'done' provable: run them, read the verdict, audit the record.
Runs on your computerUpdated today
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.
BoringToolsKit
MCP server for free, private calculators: 36 tools that compute payments, APY, budgets, home projects, and everyday math directly in Claude with no accounts and no data leaving your session.
BoringToolsKit is a free collection of private, no-signup browser calculators and everyday tools for money, home, school, and work, built for anyone who wants instant answers without accounts or uploads.
Official site: https://boringtoolskit.com
Tools
| Tool | Description |
|---|---|
tip_bill_split | Split a bill across a group after tax, tip, and optional rounding. Returns each person's share, the tip, the effective tip rate, and the collected total. |
discount_percent_off | Compute the final checkout total after stacked percentage discounts, a fixed coupon, and a tax assumption. Sequential discounts are NOT additive. |
bmi | Calculate body mass index and category from weight and height in US units. |
bmr_tdee | Estimate basal metabolic rate (Mifflin-St Jeor) and total daily energy expenditure from age, weight, height, sex, and an activity multiplier. |
mortgage_payment | Estimate the full monthly housing payment (principal, interest, tax, insurance, PMI, HOA) and the total interest over the term. Requires a positive home price. |
auto_loan | Estimate a monthly auto-loan payment from price, down payment, trade-in, term, and APR. |
compound_interest | Grow a balance with compound interest and optional monthly contributions. Returns future value, total contributed, and interest earned. |
savings_growth | Project the future value of a lump-sum investment (optionally with monthly additions), including interest earned. |
simple_interest | Compute simple interest, total value, and a comparison to annual compounding. |
calorie | Estimate BMR and total daily energy expenditure using Mifflin-St Jeor, from weight/height in US units. |
percentage | Solve percentage problems: what is X% of Y, X is what % of Y, or the % change from X to Y. |
square_footage | Compute total area (and with-waste area) from up to two rectangular spaces, plus square yards, square metres, and acres. |
apy | Compute annual percentage yield from a nominal rate and a compounding frequency, plus the one year interest and ending balance on an example deposit. |
win_loss_percentage | Compute a winning percentage from wins, losses, and ties, where ties count as half a win. |
slope | Compute slope from rise and run as degrees, percent grade, and the rise to run ratio. Run must be above zero. |
rule_of_72 | Estimate the doubling time of money at a fixed rate using the rule of 72, plus the exact doubling time from the compound formula. Rate must be between 0 and 30 percent. |
cagr | Compute the compound annual growth rate connecting a starting and an ending value over a number of years, with total return percent and absolute change. |
remainder | Compute the remainder and floored quotient of a division. Works for decimal inputs, not just integers. |
combinations | Compute the number of distinct combinations, n choose r, using a multiplicative form that avoids factorial overflow. |
margin_of_error | Compute the margin of error for a survey sample at the 90, 95, or 99 percent confidence level, assuming maximum variance proportions. |
va_mortgage | Monthly VA loan payment including the funding fee, with no PMI. Returns the financed amount, payment, and total interest. |
gross_rent_multiplier | Gross rent multiplier for a rental property: price divided by annual gross rent. Lower means more rent per dollar of price. |
emergency_fund | Emergency fund target (expenses times coverage months), the remaining gap versus current savings, and months to close the gap at a fixed monthly contribution. |
dividend_reinvestment | Compound a portfolio with a constant dividend yield and price growth, reinvesting monthly and optionally adding deposits. Returns ending value, total contributed, and dividends reinvested. |
budget_50_30_20 | Split monthly after-tax income by the 50/30/20 rule into needs, wants, and savings or debt paydown. |
growing_degree_day | Accumulate growing, heating, or cooling degree days (Fahrenheit basis) from daily high, low, a base threshold, and a day count. Includes Celsius-basis totals. |
insulation | U-value of an insulation upgrade and an estimated annual heating saving from conduction, using heating degree days, area, kWh conversion, and utility cost. |
roofing | Roof area from footprint and pitch, with waste allowance, roofing squares, and approximate shingle bundles (3 per square). |
maintenance_calories | Daily maintenance calories (TDEE) from Mifflin-St Jeor BMR and an activity level, using metric inputs. |
protein_molecular_weight | Estimate a protein chain molecular weight in Da and kDa from residue count and average residue mass, plus peptide bond count. |
key_transposition | Transpose a musical key and report the number of semitone steps upward between two keys. |
audio_time_stretch | Compute the new duration of audio at a playback speed, plus the percent time change. |
youtube_revenue | Estimated YouTube Adsense revenue from monthly views and RPM, with an annual figure and a 30 percent RPM swing range. RPM defaults to 2 when omitted. |
ceiling_tile | Count 2x2 ft ceiling tiles needed for a rectangular room, with room area and a 5 percent cut-waste reminder. |
boat_loan | Boat or RV loan payment with optional sales tax, down payment, and trade-in, including amount financed and total interest. |
pressure | Compute pressure in Pascals, kilopascals, and psi from a force in newtons over an area in square metres. |
Every tool carries readOnlyHint: true, so the server computes and returns numbers only. It never writes, never calls out to third parties, and never asks for an account.
Installation
Remote MCP (recommended, no install)
Add to claude_desktop_config.json, mcp.json, or your client's connector settings:
{"mcpServers": { "boringtoolskit": { "url": "https://boringtoolskit.com/mcp" } } }
Streamable HTTP transport, no authentication (the tools are public data). Works in Claude Desktop, Claude Code, Cursor, and any MCP client supporting remote servers.
MCP endpoint
- URL:
https://boringtoolskit.com/mcp - Transport: Streamable HTTP
- Protocol:
2024-11-05and2025-06-18tested - Auth: none required (public read-only calculator tools)
What's inside the site
The website ships 850+ lightweight browser tools that run entirely client-side. Nothing is uploaded, nothing requires an account:
- Money: loan/mortgage/payoff calculators, tip splitters, discount and tax calculators, salary and freelance rate tools
- Home: paint, flooring, BTU, energy-cost and DIY measurement calculators
- School: GPA calculators, grade trackers, unit converters, study timers
- Work: timesheet and invoice calculators, text utilities, date and timezone tools
Privacy-first by design
- No signup, no email, no accounts
- No uploads: calculation happens client-side in your browser
- Free to use, unlimited
- Full policy: https://boringtoolskit.com/privacy/
Links
- Website: https://boringtoolskit.com
- MCP endpoint: https://boringtoolskit.com/mcp
- Agent skills: https://boringtoolskit.com/skills/
- Machine-readable index: https://boringtoolskit.com/llms.txt
- Methodology: https://boringtoolskit.com/methodology/