ot-ics

ot-ics is a skill for Claude Code, Codex from xAmirHamza77/ReverseOps-Skill. It costs 33 tokens per session (796 once invoked), scanned A, original, MIT.

A safety-focused workflow for assessing industrial control systems such as PLCs, SCADA systems, and factory networks. It uses the Purdue model, a way to divide industrial environments into zones and communication layers.

In plain words
What is it for?
Use it to identify industrial assets and zones, inspect Modbus, DNP3, S7, or EtherNet/IP traffic, and review HMIs, engineering workstations, historians, and network boundaries.
Why use it?
It helps security teams understand exposure between business networks and operational technology without immediately changing or disrupting equipment. The workflow prioritizes passive, read-only checks.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to identify industrial assets and zones, inspect Modbus, DNP3, S7, or EtherNet/IP traffic, and review HMIs, engineering workstations, historians, and network boundaries.

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Install with agentmods
npx agentmods add skills/xamirhamza77/reverseops-skill/ot-ics
Install

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.

Any agent
npx skills add xAmirHamza77/ReverseOps-Skill --skill ot-ics
Clone the repo
git clone --depth 1 https://github.com/xAmirHamza77/ReverseOps-Skill

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for ot-ics

README.md
[![agentmods](https://agentmods.dev/badge/skills/xamirhamza77/reverseops-skill/ot-ics/github.svg)](https://agentmods.dev/skills/xamirhamza77/reverseops-skill/ot-ics)
Your own site
<a href="https://agentmods.dev/skills/xamirhamza77/reverseops-skill/ot-ics"><img src="https://agentmods.dev/badge/skills/xamirhamza77/reverseops-skill/ot-ics/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.

agentmods 80×15 button for ot-ics

Your own site · 80×15
<a href="https://agentmods.dev/skills/xamirhamza77/reverseops-skill/ot-ics"><img src="https://agentmods.dev/badge/skills/xamirhamza77/reverseops-skill/ot-ics.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 796 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00033 $0.00796
Opus 5 $0.00016 $0.00398
Sonnet 5 $0.00007 $0.00159
Haiku 4.5 $0.00003 $0.00080

Measured 6d ago against content hash 0a318ffe01ab, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

ot-ics 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 6d 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.

skills/ot-ics/SKILL.md · 93 lines

How it starts

The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OT / ICS Security

ACTION REQUIRED (execute immediately after reading)

  1. NOW: Read ../field-journal/precedent-pentest.mdmis-operation in ICS environments can cause physical harm
  2. NOW: The written authorization must state clearly: site, network segments, and whether active scanning/writing registers is permitted
  3. NOW: case-init; default to passive-first; no writes to PLCs before ready_for_act
  4. NEXT: tool-index; most ICS tools require manual setup and an isolated lab network
  5. ACT: Asset and zone identification → attack surface → read-only verification

Applicable Scenarios

  • ICS/SCADA/DCS security assessment (authorized)
  • Purdue model zoning and cross-zone channels
  • Exposure of Modbus/DNP3/S7/EtherNet/IP and similar protocols
  • Engineering workstations, HMIs, historians, jump hosts
  • IT/OT convergence boundaries (firewall rules, data diodes)

Safety Ground Rules (MUST)

MUST NOT, unless explicitly permitted:
- Write coils/registers on PLCs
- Run high-rate scans across production OT networks
- disrupt paths related to safety instrumented systems (SIS)
Prefer: read-only identification, traffic mirroring, offline firmware/configuration analysis

Workflow

Phase 1 — Zones & Assets

□ Purdue L0–L5 sketch: field devices → control → supervision → site DMZ → enterprise
□ Asset inventory: PLC/RTU/HMI/engineering station/historian/jump host
□ Protocol and port baseline (authorized segments only)

Phase 2 — Passive & Read-Only

□ SPAN/mirrored PCAP → protocol-reverse / Wireshark ICS dissectors
□ Offline audit of configurations and project files (TIA/RSLogix exports, etc.)
□ Record default passwords and cleartext protocols (Modbus has no authentication) as Findings; do not write or change values

Phase 3 — Restricted Active (Only When Authorized)

□ Low-rate identification during maintenance windows
□ Prefer read-only function codes
□ Evidence at every step; stop immediately and notify if anything abnormal occurs

Read the full file on GitHub · 93 lines

Files

What ships with it

1 file 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.

Changes

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.

  1. 6d ago First seen · 93 lines · 33 tokens per session scan A 0a318ffe01ab

Subscribe to this mod's changes

ot-ics is a skill published in the GitHub repository xAmirHamza77/ReverseOps-Skill (4 stars, last pushed 1mo ago), licensed MIT. It adds 33 tokens to every session and 796 once invoked, about $0.0002 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 2026-09-03.

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