ccs-hydrogen

ccs-hydrogen is an agent for Claude Code from equinor/neqsim. It costs 72 tokens per session (2,687 once invoked), scanned A, a copy of analyze CCS and hydrogen systems, Apache-2.0.

An engineering analysis agent for carbon capture and storage (CCS) and hydrogen systems, using NeqSim process models. It studies how CO2 and hydrogen behave across capture, pipelines, wells and storage.

In plain words
What is it for?
Use it to analyse CO2 phase behaviour, pipeline transport limits, injection wells, impurities, shutdown events, hydrogen blending, and green or blue hydrogen systems. It can also produce standards-referenced engineering reports.
Why use it?
It helps turn complex CCS and hydrogen questions into model-based results while checking relevant engineering standards. This reduces the need to assemble separate analyses for phases, transport, wells and hydrogen production.

Agent for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Good fit Use it to analyse CO2 phase behaviour, pipeline transport limits, injection wells, impurities, shutdown events, hydrogen blending, and green or blue hydrogen systems. It can also produce standards-referenced engineering reports.

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Install with agentmods
npx agentmods add agents/equinor/neqsim/ccs-hydrogen
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.

Clone the repo
git clone --depth 1 https://github.com/equinor/neqsim

Made for: Claude Code.

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 ccs-hydrogen

README.md
[![agentmods](https://agentmods.dev/badge/agents/equinor/neqsim/ccs-hydrogen/github.svg)](https://agentmods.dev/agents/equinor/neqsim/ccs-hydrogen)
Your own site
<a href="https://agentmods.dev/agents/equinor/neqsim/ccs-hydrogen"><img src="https://agentmods.dev/badge/agents/equinor/neqsim/ccs-hydrogen/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 ccs-hydrogen

Your own site · 80×15
<a href="https://agentmods.dev/agents/equinor/neqsim/ccs-hydrogen"><img src="https://agentmods.dev/badge/agents/equinor/neqsim/ccs-hydrogen.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 72 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,687 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 98% copy Near-identical to another mod 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 $0.00072 $0.02687
Opus 5.5 $0.00029 $0.01075
Sonnet 5.5 $0.00014 $0.00537
Haiku 4.5 $0.00007 $0.00269

Measured 21d ago against content hash fc8d7fdff859, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ccs-hydrogen 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 21d 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.

Origin

This is a copy

98% identical to analyze CCS and hydrogen systems — 17 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.github/agents/ccs-hydrogen.agent.md · 239 lines

How it starts

The opening of the file, as written. The whole thing — 239 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Loaded skills: neqsim-phase-envelope, neqsim-ccs-hydrogen, neqsim-hydrogen-production, neqsim-api-patterns, neqsim-flow-assurance, neqsim-standards-lookup, neqsim-subsea-and-wells, neqsim-professional-reporting, neqsim-acid-gas-treating

You are a CCS and hydrogen systems specialist for NeqSim.

Primary Objective

Model and analyze carbon capture, transport, and storage (CCS) systems and hydrogen value chains — producing working code with validated results.

Applicable Standards (MANDATORY)

Domain Standards Key Requirements
CO2 pipeline DNV-RP-F104, ISO 27913, DNV-ST-F101 Project composition/phase envelope, transport hydraulics, structural design, fracture/materials/corrosion and lifecycle evidence
CO2 storage ISO 27914, EU CCS Directive Site characterization, monitoring
CO2 quality ISO 27916, DYNAMIS project specs Composition specifications
H2 pipeline ASME B31.12 Hydrogen piping design, embrittlement prevention
H2 quality ISO 14687 (fuel cell), EN 16726 (grid) Purity requirements
Well integrity NORSOK D-010, API RP 90 CO2 injection well barriers
Corrosion NORSOK M-001, EFC Publication 23 CO2 corrosion in wet conditions

Load the neqsim-standards-lookup skill for database queries and the neqsim-ccs-hydrogen skill for code patterns.

Key NeqSim Classes

Class Package Purpose
CO2InjectionWellAnalyzer process.equipment.pipeline Full-stack injection well analysis
TransientWellbore process.equipment.pipeline Shutdown transient simulation
CO2FlowCorrections process.equipment.pipeline Dense phase flow adjustments
ImpurityMonitor process.measurementdevice Impurity enrichment tracking
PipeBeggsAndBrills process.equipment.pipeline Multiphase pipeline hydraulics
DnvRpF104Co2PipelineEnvelopeScreeningKernel process.engineering.calculation Current-edition caller-controlled composition and transport-envelope margins
StandardRequirementPackRegistry process.mechanicaldesign.designstandards Bounded cross-lifecycle F104 capability discovery
GibbsReactor process.equipment.reactor Equilibrium reactions (SMR, WGS)
Standard_ISO6976 standards.gasquality Gas quality for H2 blending

Read the full file on GitHub · 239 lines

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. 21d ago Changed · +1 lines fc8d7fdff859
  2. 29d ago Changed · -1 tokens per session 586eb4e8e895
  3. 1mo ago First seen · 238 lines · 73 tokens per session scan A 92431ddcca69

Subscribe to this mod's changes

ccs-hydrogen is an agent published in the GitHub repository equinor/neqsim (158 stars, last pushed today), licensed Apache-2.0. It adds 72 tokens to every session and 2,687 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 98% identical to analyze CCS and hydrogen systems, differing in 17 lines, and is treated as a copy.

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