Borrowing it
Nothing to install: this file belongs to efranceschetti/festo-codesys-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/efranceschetti/festo-codesys-mcp/main/.claude/skills/hmi-gateway/SKILL.mdgit clone --depth 1 https://github.com/efranceschetti/festo-codesys-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/efranceschetti/festo-codesys-mcp/hmi-gateway)<a href="https://agentmods.dev/skills/efranceschetti/festo-codesys-mcp/hmi-gateway"><img src="https://agentmods.dev/badge/skills/efranceschetti/festo-codesys-mcp/hmi-gateway/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/efranceschetti/festo-codesys-mcp/hmi-gateway"><img src="https://agentmods.dev/badge/skills/efranceschetti/festo-codesys-mcp/hmi-gateway.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00078 | $0.00323 |
| Opus 5 | $0.00039 | $0.00161 |
| Sonnet 5 | $0.00016 | $0.00065 |
| Haiku 4.5 | $0.00008 | $0.00032 |
Grade A, and why
hmi-gateway scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
HMI & OPC UA Gateway
1. Pick the architecture reference
- Web HMI (browser-based, HTML/JS) ->
plc_knowledgeaction=topichmi-web-architecture - OPC UA <-> WebSocket bridge -> topic
opcua-websocket-gateway - Deploying to embedded targets (CDPX browser, panel constraints) -> topic
hmi-embedded-deploy - Native CDPX / TargetVisu / WebVisu -> topic
festo-cdpx-hmi
2. PLC side
- Expose data through a dedicated
GVL_HMI(create_gvl) — HMI never touches FB internals. - OPC UA symbol exposure and MQTT alternatives -> topic
festo-mqttfor the IIoT library stack.
3. Web side
Follow the loaded architecture topic for the stack choice, update rates, and security notes. Do not invent OPC UA node-id conventions — take them from the gateway topic.
4. Record
HMI stack choice, gateway endpoints, and tag-naming scheme -> .claude/memory/decisions.md.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 23 lines · 78 tokens per session scan A 2af2dd68ee87
hmi-gateway is a skill published in the GitHub repository efranceschetti/festo-codesys-mcp (1 stars, last pushed 5d ago), licensed MIT. It adds 78 tokens to every session and 323 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other skills, from other repositories
codesys
Develop CODESYS Structured Text and Python ScriptEngine workflows; troubleshoot fieldbus and OPC UA integration in a test environment.
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Use when integrating, porting, configuring, or debugging U8g2 displays, OLED/LCD drivers, I2C/SPI callbacks, fonts, frame buffers, or monochrome embedded UI.
tia.init
Initialize or update the current project's AGENTS.md with the TIA harness operating guide. USE WHEN the user asks to "init / bootstrap / set up the TIA harness", "add the harness guidance to AGENTS.md", or "update the TIA harness section / refresh the harness guide in this project". Idempotent: injects the guide…
cpu.select
Recommend a Siemens S7-1500/S7-1200 CPU family + variant + order number (MLFB) from an engineering need (I/O count, scan/performance, memory, communication ports, safety, redundancy, motion). USE when the user asks "which CPU / PLC should I use", gives selection criteria instead of a model, or needs a typeIdentifier…
spec.validate
Validate a TIA project-spec against the JSON Schema AND the deterministic cross-field engineering rules (same-subnet, unique names, OrderNumber: /V format, module limits, language-by-family, and the G5 safety rule). USE when the user provides or edits a project-spec, asks to "validate / check / lint my spec", or…
tia.handoff
Prepare a human-approval envelope for a GATED operation — download / CPU-STOP (G3), go-online (G4), network scan (G7), master-secret/UMAC (G6), safety/F (G5). USE WHEN the user wants to "download / deploy / go online / commission", or after tia.verify is clean and the next step touches the physical controller, the…