TwinCat-MCP — Documentation

Source for the public user documentation of TwinCat-MCP — an MCP server for TwinCAT 3 PLC development that lets AI coding agents (Claude Code, GitHub Copilot CLI, Cursor) build, configure, deploy, and debug TwinCAT PLC projects through a standard tool interface.

📖 Live site: docs.twincatmcp.qubernetic.com

Built with MkDocs Material. This repository holds the documentation content only; the product itself lives in a separate private repository.

Local development

Requires Python 3.x. Use a virtual environment to match the pinned build:

python -m venv .venv
source .venv/bin/activate          # Windows: .venv\Scripts\activate
pip install -r requirements.txt

mkdocs serve                       # live preview at http://127.0.0.1:8000
mkdocs build --strict              # production build (must pass — CI gate)

The social-card plugin needs the Cairo graphics libraries. On Debian/Ubuntu: sudo apt-get install libcairo2-dev libfreetype6-dev libffi-dev libjpeg-dev libpng-dev libz-dev

Related MCP server: TwinCAT Validator MCP Server

Repository layout

mkdocs.yml                     # site config: theme, nav, plugins, brand
requirements.txt               # pinned mkdocs-material + plugins
docs/
├── index.md                   # landing / showcase
├── CNAME                      # custom domain (docs.twincatmcp.qubernetic.com)
├── assets/                    # logo (light/dark), favicon
├── stylesheets/extra.css      # brand accent + dark-mode logo swap
├── getting-started/           # installation, agent connection, configuration
├── licensing/                 # user-facing licensing how-to
├── tools/overview.md          # tools overview
└── changelog.md               # public changelog
.github/workflows/deploy-docs.yml   # build + deploy to GitHub Pages
SECURITY.md · CODE_OF_CONDUCT.md · LICENSE

How it deploys

Every push to main runs the deploy workflow: it builds the site with mkdocs gh-deploy --force (strict mode) and publishes to the gh-pages branch, which GitHub Pages serves at the custom domain. The docs/CNAME file preserves docs.twincatmcp.qubernetic.com across deploys.

Contributing

• Branching: Gitflow — work on feature/*, PR into develop; main is the published site.

• Commits: Conventional Commits (docs:, feat:, fix:, chore:, …).

• Keep mkdocs build --strict green — broken links and nav fail the build (and the deploy).

⚠️ This is a public repository

Only curated, user-facing content belongs here. Never add:

• how licensing is enforced under the hood (token issuance/validation, machine binding, replay protection);

• TwinCAT Automation-Interface implementation details or internal type names;

• internal source, samples, or planning documents;

• the name of any prior employer or third party.

When in doubt, leave it out — this content is world-readable.

License

© 2026 Csaba Biró (Qubernetic). All rights reserved. See LICENSE. Documentation is published for use with the TwinCat-MCP product; redistribution or derivative works require permission.

A Qubernetic product — we build the future.