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Introducing the siliXon MCP

, Founding Engineer5 min read

A board made through the siliXon MCP, shown in the chat that asked for it.

We noticed that a huge share of the people who use siliXon prompt it through an AI agent. So we built the siliXon MCP: one server that lets ChatGPT, Claude, Cursor, Claude Code or any other MCP client use siliXon the way you do.

Your agent can now run our placement, routing and manufacturing checks, send us feedback, or hand the whole job to Rocky. It is available to everyone, and your first project is free.

What your agent can do

  • Ask Rocky for a board in plain English, send it images and datasheets, and answer its questions.
  • Place and route the board on our servers, with the same Autoplace and Route the editor runs.
  • Run the manufacturing checks, then download the KiCad project and the Gerbers.
  • Import a KiCad project or a Specctra DSN, and manage your projects and settings.
  • Rate a reply or send feedback, as you would in the app.

MCP usage follows the same rules as the rest of siliXon. Your plan gives an agent exactly what it gives you in the app, and an agent you connect works only on projects you can open.

The board, live in the chat

In ChatGPT and Claude, the board appears right in the conversation. It is siliXon's own editor, read-only: the 2D layout, the 3D view, the schematic and Rocky's chat. It follows the project while your agent and Rocky work, so you watch the board change without leaving the chat. Go to project opens it in the full editor whenever you want to take over.

Same model, same prompt, with and without siliXon

We gave Claude Fable 5.2 three boards to design. Each request ended the same way: "Design the PCB and give me the files to order it from JLCPCB: Gerbers, drill file, BOM and pick-and-place." Fable did each one twice: once on its own, writing scripts and driving KiCad, and once with only the siliXon MCP connected.

BoardFable 5.2Fable 5.2 + siliXon MCP
An ESP32 board that logs temperature to an SD card30.5 min, $11.96, 2 errors7.4 min, $1.64, 0 errors
A garden sensor that texts me when the soil is dry22.6 min, $7.28, 1 error5.5 min, $1.25, 0 errors
A bike light that gets brighter as I brake43.8 min, $16.11, 4 errors8.2 min, $1.42, 0 errors

With siliXon, Fable finished each board 4 to 5 times faster and used 6 to 11 times less Claude usage. Every siliXon board opened in KiCad with no design-rule errors.

How we measured it

  • One run per prompt, on 10 November 2026, with Fable 5.2 at Medium effort in Claude Code. Each run could get one reply telling it to pick sensible defaults, and had 45 minutes. A second run would not give the same numbers.
  • Cost is Claude usage only. siliXon's own compute is not in it.
  • Errors are KiCad 10 design-rule errors under JLCPCB's and PCBWay's fab rules, the same rules for every board.
  • siliXon ran on our staging deployment.

The boards are not the same designs, and Fable's own are good:

  • Its garden sensor builds the soil probe into the board. Ours has a connector for an external probe.
  • Its bike light has eight LEDs. Ours has four.
  • On its own, Fable produced no schematic. Every siliXon board has one in the editor.
  • In the siliXon runs, Fable put the BOM together itself from Rocky's part list. A BOM download for agents is next on our list.

Connect it

The server lives at:

https://app.silixon.io/mcp

Sign in to siliXon, or create an account, when your agent asks.

  • Cursor: add siliXon to Cursor in one click.
  • Claude Code: run claude mcp add --transport http silixon https://app.silixon.io/mcp.
  • Claude: open Customize > Connectors, choose Add custom connector, and paste the address.
  • ChatGPT: turn on Developer mode in Settings, then create a connector with the address.
  • Any other MCP client: add the address as a remote MCP server.

siliXon will be listed in ChatGPT's and Claude's directories soon, which makes those one click too.

Tell us what you build with it on Discord.

Happy designing!