Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add alivirgo/Major-AI-Skills --skill codesysgit clone --depth 1 https://github.com/alivirgo/Major-AI-SkillsWrote 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/alivirgo/major-ai-skills/codesys)<a href="https://agentmods.dev/skills/alivirgo/major-ai-skills/codesys"><img src="https://agentmods.dev/badge/skills/alivirgo/major-ai-skills/codesys/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/alivirgo/major-ai-skills/codesys"><img src="https://agentmods.dev/badge/skills/alivirgo/major-ai-skills/codesys.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 | $0.00027 | $0.01913 |
| Opus 5 | $0.00014 | $0.00957 |
| Sonnet 5 | $0.00005 | $0.00383 |
| Haiku 4.5 | $0.00003 | $0.00191 |
Grade B, and why
codesys scanned grade B with 1 finding 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 today.
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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
| **"Communication error: Device not reachable"** | CODESYS Gateway service stopped or firewall blocking TCP port 1217 on target PLC. | 1. In Windows Services, verify **CODESYS Gateway SysService** is running.<br>2. On L How it starts
The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CODESYS V3.5 IEC 61131-3 Industrial Automation AI Skill Guide (Claude)
Overview & Engine Architecture
CODESYS V3.5 is the global industry standard, hardware-agnostic IEC 61131-3 automation software and PLC programming platform powering over 400+ controller manufacturers (Beckhoff, WAGO, Festo, Schneider Electric, Eaton, Berghof). The platform combines the CODESYS Control V3 Real-Time Runtime, full IEC 61131-3 language support (Structured Text ST, Continuous Function Chart CFC, Function Block Diagram FBD, Sequential Function Chart SFC, Ladder Diagram LD), integrated Fieldbus protocol stacks (EtherCAT Master, PROFINET IO Controller, Modbus TCP/RTU, CANopen), an embedded OPC UA Server, and the CODESYS ScriptEngine (Python automation API). Claude operates as a Principal Industrial Automation Architect and Controls Software Engineer, specializing in Structured Text (ST) state machine authoring, ScriptEngine automated build pipelines, EtherCAT topology validation, and CODESYS Gateway communication diagnostics.
CODESYS Multi-Tier Architecture & Fieldbus Stack
┌─────────────────────────────────────────────────────────────┐
│ CODESYS V3.5 Architecture │
│ │
│ Engineering & ScriptEngine Tier │
│ ├── CODESYS Development System IDE (POUs, GVls, Data Types)│
│ ├── CODESYS ScriptEngine (Python Automation & CI/CD) │
│ └── CODESYS Visualization (TargetVisu & WebVisu HTML5) │
│ │
│ IEC 61131-3 Execution & Real-Time Runtime │
│ ├── CODESYS Control V3 Runtime (Preemptive Task Scheduler) │
│ ├── Task Configuration (Cyclic, Event, Freewheeling Tasks) │
│ └── SoftMotion CNC & Robotics 3D Coordinate Transformer │
│ │
│ Industrial Communications & Fieldbus Core │
│ ├── Embedded OPC UA Server (Data Access & Methods) │
│ ├── Fieldbus Masters (EtherCAT, PROFINET, Modbus TCP, CAN) │
│ └── CODESYS Gateway Service (SysService Communication:1217)│
└─────────────────────────────────────────────────────────────┘
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- today Changed · -29 tokens per session c86563bfde4c
- 6d ago First seen · 158 lines · 56 tokens per session scan B b110c60316e8
codesys is a skill published in the GitHub repository alivirgo/Major-AI-Skills (1 stars, last pushed today), licensed MIT. It adds 27 tokens to every session and 1,913 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.
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