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Contraptify MCP Server

by torsviklabs Your server? Claim it
not responding

Contraptify is listed as active in the registry but did not answer our last check. It exposes 5 tools.

Design redstone machines with your AI and test them tick by tick with Java Edition 26.3 rules.

The linked repository no longer exists on GitHub — it was deleted or made private.

Uptime history 7 days of history · worst day 0%
7 days agonow
0.0%
Uptime 24h
0 of 91 checks
5
Tools
read from the server
92 ms
Response time
average over 24h
open, no key
Access
streamable-http

What changed 1

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 3 November 2026. No other catalogue keeps this.

3 Nov a tool description was rewritten show

Contraptify does not always answer

Over the last week it answered 4.2% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

run in your terminal
claude mcp add contraptify --transport http https://mcp.contraptify.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://mcp.contraptify.com/mcp
~/.codex/config.toml
[mcp_servers.contraptify]
url = "https://mcp.contraptify.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "contraptify": {
      "url": "https://mcp.contraptify.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "contraptify": {
      "type": "http",
      "url": "https://mcp.contraptify.com/mcp"
    }
  }
}

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

example
get_example
Return one built-in example design with its blocks, part explanations and its own test, by id from list_examples. Large designs (the 0-9 counter has about 2,500 blocks, the 00-59 clock about 5,100) are long. Do not use it to show an example to the user: use show with example set.
examples
list_examples
List the built-in example designs (clocks, counters, a piston door, a lock, a flying machine). Use it to find a known-good starting point. Do not use it to fetch a design's blocks: use get_example.
explain
explain
List a design's parts with their explanations, how many blocks each covers, and any blocks without a part. Use it before show to make sure every block is explained. Do not use it to test whether the machine works: use simulate.
show
show
Show a design to the user in an interactive 3D viewer in the chat: they can press its button or flip its lever, watch it run tick by tick, move around, and click any part to read what it does. Give either design, or example (an id from list_examples). Call it once per answer, at the end, after the last simulate passes: every call adds another viewer to the chat. Do not use it to test a design: use simulate.
simulate
simulate
Run a redstone design with its own test (inputs and expectations) and return which expectations hold and which fail (with what the block was instead, and when), what visibly changed (lamps, pistons, doors, dispensers) and when, dispenser shots, and notes on what broke. Without a test it just runs the machine and reports what changed. Use it on every candidate before showing it. Do not use it to display a design to the user: use show.

Endpoints

URLTransportStateLatencyChecked
https://mcp.contraptify.com/mcp streamable-http answering 92 ms 11 min ago

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Contraptify — questions

Answers built from our own checks of this server.

What can Contraptify do?
It exposes 5 tools, read directly from the server on our last check. Among them: explain, get_example, list_examples, show, simulate. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Contraptify working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 91 checks got a reply (0.0%), average response time 92 ms. The bar chart above shows every period we have measured.
Is Contraptify still maintained?
The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.
The registry lists Contraptify as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect Contraptify?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Contraptify need an API key?
No. Contraptify completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.