Web Algebra

Name: Web Algebra
Author: AtomGraph

by AtomGraphversion 2.0.4i★ –iRuns on your computer

Registry nameio.github.AtomGraph/web-algebra

Install

Overview

Description from the maker (original English)

Composable Linked Data and SPARQL operations, and LinkedDataHub content tools

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 on your computer
Transport: stdio
Category: Other
You need to fill in: CERT_PASSWORD, OPENAI_API_KEY

Install

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

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: CERT_PEM_PATH, CERT_PASSWORD, OPENAI_API_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "web-algebra": {
      "command": "uvx",
      "args": [
        "web-algebra",
        "mcp"
      ],
      "env": {
        "CERT_PEM_PATH": "your-value",
        "CERT_PASSWORD": "your-value",
        "OPENAI_API_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add web-algebra --env CERT_PEM_PATH=your-value --env CERT_PASSWORD=your-value --env OPENAI_API_KEY=your-value -- uvx web-algebra mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "web-algebra": {
      "command": "uvx",
      "args": [
        "web-algebra",
        "mcp"
      ],
      "env": {
        "CERT_PEM_PATH": "your-value",
        "CERT_PASSWORD": "your-value",
        "OPENAI_API_KEY": "your-value"
      }
    }
  }
}

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.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "web-algebra": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "web-algebra",
        "mcp"
      ],
      "env": {
        "CERT_PEM_PATH": "your-value",
        "CERT_PASSWORD": "your-value",
        "OPENAI_API_KEY": "your-value"
      }
    }
  }
}

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.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

CERT_PEM_PATH env
Path to the LinkedDataHub client certificate (PEM), for authenticated requests
CERT_PASSWORD secret env
Password of the client certificate
OPENAI_API_KEY secret env
OpenAI API key, used by SPARQLString to write queries

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

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account AtomGraph, 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 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

Compared with others in Otheri

More stars than 0% of the other 32403 servers in this category
Published to the registry more recently than 81% of the other 32403 servers in this category
Basic checks equal to or better than 100% of the other 32403 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 Web Algebra 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?

You need to fill in: CERT_PASSWORD, OPENAI_API_KEY

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 –, and the latest version (2.0.4) reached the registry 7 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, LickityClick

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

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

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 yesterday

Install

LickityClick

by lickity.click

Create, edit and track LickityClick short links, campaigns and click stats from your AI assistant.

Computer or cloudUpdated 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.

Web-Algebra

A composable RDF operations system that translates natural language instructions into JSON-formatted domain-specific language operations for loading, querying, and writing RDF Linked Data.

Overview

This system implements generic operations for RDF Linked Data and SPARQL management, as well as some LinkedDataHub-specific operations. Operations can be consumed in two ways:

Executable JSON format: Operations are composed into JSON structures and executed by the provided execution engine
Model Context Protocol (MCP): Operations are exposed as tools for AI agents to use interactively

Instead of agents executing semantic workflows step-by-step through individual MCP tool calls, Web-Algebra enables agents to compile entire workflows into optimized JSON "bytecode" that executes atomically - enabling complex multi-operation compositions.

Demo

*See WebAlgebra in action - translating natural language into RDF operations.*

Architecture

The system is built around the Operation abstract base class that provides:

Registry System: Auto-discovery of operations from src/web_algebra/operations/
JSON DSL: Operations use @op key with args for parameters, supporting nested operation calls
RDFLib Type System: Uses URIRef, Literal, Graph, and Result types internally for proper RDF handling
Execution Engine: Both standalone execution and MCP server integration
Context System: ForEach operations set row context for inner operations to access via Value
URI Resolution: Proper semantic URI construction with ResolveURI operation

Key Components

[System Prompt](src/web_algebra/prompts/system.md): Complete operation definitions and JSON format specification
[Formal Semantics](formal-semantics.md): Complete type system and operation catalog
[Operation Interface](src/web_algebra/operation.py): Base class and JSON interpreter
[Operation Implementations](src/web_algebra/operations/): Directory containing all available operations
[Examples](examples/): Real-world plans over live Linked Data, each with its result and checks

Operations

The operations cover read-write Linked Data, SPARQL queries, URI manipulation, and LinkedDataHub-specific resource creation. Non-exhaustive list:

Linked Data
GET
PATCH
POST
PUT
SPARQL
CONSTRUCT
DESCRIBE
SELECT
Substitute
Values
SPARQLString
Schema
ExtractClasses
ExtractDatatypeProperties
ExtractObjectProperties
ExtractOntology
Reconciliation
Reconcile
URI & String Operations
ResolveURI
EncodeForURI
Concat
Replace
Str
StrUUID
URI
Date/Time
Now
Control Flow & Variables
Value
Variable
ForEach
Iterate
Filter
Bindings
Current
Position
Last
Merge
LinkedDataHub-specific
ldh-CreateContainer
ldh-CreateItem
ldh-List
ldh-AddFile
ldh-AddGenericService
ldh-AddResultSetChart
ldh-AddSelect
ldh-AddConstruct
ldh-AddView
ldh-AddObjectBlock
ldh-AddXHTMLBlock
ldh-RemoveBlock
ldh-GeneratePortal
ldh-GenerateClassContainers
ldh-GenerateOntologyViews

Usage

Pre-requisites

Install uv
`bash uv venv uv sync

Standalone

Natural language instruction

uv run python src/web_algebra/main.py

Then enter instruction, for example:

Select random 10 UK cities from DBpedia

See the instructions of the examples.

_Currently requires OpenAI API access. OPENAI_API_KEY env value has to be set._

Execute JSON

uv run web-algebra --from-json ./examples/city-profiles/plan.json

See the examples: each has the instruction it answers, its plan, the result of a run, and checks.

With LinkedDataHub

Run LinkedDataHub v6
Give web-algebra your LDH's owner certificate and its password in the CERT_PEM_PATH and CERT_PASSWORD environment variables (or the --cert_pem_path and --cert_password options, which override them). For example:

export CERT_PEM_PATH=../LinkedDataHub/ssl/owner/cert.pem

export CERT_PASSWORD="$(cat ../LinkedDataHub/secrets/owner_cert_password.txt)" uv run web-algebra --from-json ./examples/northwind-category-catalogue/plan.json

_Here and throughout this guide, the client certificate and its password are only required for authentication with LinkedDataHub. You don't need them if you're not using LinkedDataHub with Web Algebra._

As MCP server

Install

Requires uv. Add this to your MCP client configuration (e.g. claude_desktop_config.json):

"mcpServers": { "web-algebra": { "command": "uvx", "args": ["--from", "web-algebra", "web-algebra-mcp"], "env": { "CERT_PEM_PATH": "/path/to/LinkedDataHub/ssl/owner/cert.pem", "CERT_PASSWORD": "********" } } } }

or with Claude Code:

claude mcp add web-algebra -e CERT_PEM_PATH=/path/to/LinkedDataHub/ssl/owner/cert.pem -e CERT_PASSWORD=******** -- uvx --from web-algebra web-algebra-mcp

uvx web-algebra mcp runs the same server.

Environment variables:

Name	Required	Description
`CERT_PEM_PATH`	No	Path to the LinkedDataHub owner certificate (PEM). Only needed for LinkedDataHub operations.
`CERT_PASSWORD`	No	Password for the certificate above.
`OPENAI_API_KEY`	No	OpenAI API key. Only needed for the `SPARQLString` tool, which asks a model to write the query.

stdio transport

uv run web-algebra-mcp

Streamable HTTP transport

uv run uvicorn web_algebra.server:app --reload

with CERT_PEM_PATH and CERT_PASSWORD set, as above, for LinkedDataHub.

MCP Inspector config

You can the inspector like this:

npx @modelcontextprotocol/inspector

and then open on the URL printed in its console output, for example:

http://localhost:6274/?MCP_PROXY_AUTH_TOKEN=b31e4b3d852b5a2445f45032c484e54e319bf16359585858cf88fe9a90816744

The MCP_PROXY_AUTH_TOKEN is required. If the link does not appear, you need to copy the session token from the console and paste it into inspector's Proxy Session Token config.

Web Algebra's settings:

Transport Type Streamable HTTP URL http://127.0.0.1:8000/mcp

Claude Desktop tool config from a local checkout

To run the MCP server from a local checkout instead of the published package, add a Web Algebra entry (that uses stdio transport) to the mcpServer configuration your claude_desktop_config.json file:

"mcpServers": { "Web Algebra": { "command": "uv", "args": [ "--directory", "/path/to/Web-Algebra", "run", "web-algebra-mcp" ], "env": { "CERT_PEM_PATH": "/path/to/LinkedDataHub/ssl/owner/cert.pem", "CERT_PASSWORD": "********" } } } }

_Leave the command as it is. Those `uv run --with` arguments are important, otherwise 3rd party packages cannot be found._

On my Mac, the path to uv has to be absolute, otherwise it doesn't work in Claude Desktop 🤷♂️.

CERT_PEM_PATH and CERT_PASSWORD env values are optional.

Web Algebra

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

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

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

LickityClick

README from the maker

Web-Algebra

Overview

Demo

Architecture

Key Components

Operations

Usage

Pre-requisites

Standalone

Natural language instruction

Execute JSON

With LinkedDataHub

As MCP server

Install

stdio transport

Streamable HTTP transport

MCP Inspector config

Claude Desktop tool config from a local checkout