What is ontology-explorer?

A tool for exploring materials-science ontologies, which are formal maps of concepts and their relationships. It can browse classes, inspect properties and their allowed types, search terms, and summarize OWL/XML files.

Use it to query CMSO or ASMO structures, investigate terms such as materials and crystal lattices, and parse OWL files from a path or URL.

It avoids repeatedly reading large ontology files when you only need a class, property, hierarchy, or relationship.

ontology-explorer — Skill for Claude Code by HeshamFS

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 HeshamFS/materials-simulation-skills --skill ontology-explorer

Clone the repo

git clone --depth 1 https://github.com/HeshamFS/materials-simulation-skills

Made for: Claude Code.

Or install ontology, the plugin that ships this one along with the rest of its 3 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/heshamfs/materials-simulation-skills/ontology-explorer/github.svg)](https://agentmods.dev/skills/heshamfs/materials-simulation-skills/ontology-explorer)

Your own site

<a href="https://agentmods.dev/skills/heshamfs/materials-simulation-skills/ontology-explorer"><img src="https://agentmods.dev/badge/skills/heshamfs/materials-simulation-skills/ontology-explorer/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/heshamfs/materials-simulation-skills/ontology-explorer"><img src="https://agentmods.dev/badge/skills/heshamfs/materials-simulation-skills/ontology-explorer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 151 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,915 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.

Model	Per session	Once invoked
Fable 5.1	$0.00151	$0.03915
Opus 5.5	$0.00060	$0.01566
Sonnet 5.5	$0.00030	$0.00783
Haiku 4.5	$0.00015	$0.00392

Measured 3d ago against content hash c1e23cde668c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ontology-explorer 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 3d ago.

The scan reads SKILL.md. This mod also ships 4 executable files (scripts/class_browser.py, scripts/ontology_summarizer.py, scripts/owl_parser.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/ontology/ontology-explorer/SKILL.md · 263 lines

How it starts

The opening of the file, as written. The whole thing — 263 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ontology Explorer

Goal

Enable an agent to understand, navigate, and query the structure of materials science ontologies without loading verbose OWL/XML files directly. Provides fast access to class hierarchies, property definitions, and domain-range relationships through pre-processed JSON summaries.

Requirements

Python 3.10+
No external dependencies (Python standard library only)
Internet access required only for owl_parser.py and ontology_summarizer.py when fetching remote OWL files

Inputs to Gather

Input	Description	Example
Ontology name	Registered ontology to query	`cmso`
Class name	A specific class to inspect	`Material`, `UnitCell`
Property name	A specific property to look up	`hasMaterial`, `hasSpaceGroupNumber`
Search term	Keyword to search across labels	`crystal`, `lattice`
OWL source	Path or URL to an OWL/XML file (for parsing/summarizing)	`https://raw.githubusercontent.com/OCDO/cmso/main/cmso.owl`

Decision Guidance

What do you need?
├── Understand overall ontology structure
│   └── class_browser.py --ontology cmso --list-roots
├── Inspect a specific class
│   └── class_browser.py --ontology cmso --class <name>
├── Find properties for a class
│   └── property_lookup.py --ontology cmso --class <name>
├── Look up a specific property
│   └── property_lookup.py --ontology cmso --property <name>
├── Search for a concept
│   ├── class_browser.py --ontology cmso --search <term>
│   └── property_lookup.py --ontology cmso --search <term>
├── Parse a new/updated OWL file
│   └── owl_parser.py --source <path-or-url>
└── Generate/refresh a summary JSON
    └── ontology_summarizer.py --source <url> --output <path>

Script Outputs (JSON Fields)

Script	Key Outputs
`scripts/owl_parser.py`	`results.metadata`, `results.classes`, `results.object_properties`, `results.data_properties`, `results.class_hierarchy`
`scripts/ontology_summarizer.py`	`results.output_file`, `results.statistics`
`scripts/class_browser.py`	`results.class_info`, `results.subtree`, `results.properties`, `results.path_to_root`, `results.roots`, `results.search_results`
`scripts/property_lookup.py`	`results.property_info`, `results.class_properties`, `results.search_results`

Read the full file on GitHub · 263 lines

Files

What ships with it

13 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.

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.

3d ago Changed · +2 lines c1e23cde668c
1mo ago First seen · 261 lines · 151 tokens per session scan A 54bbe5029e44

Subscribe to this mod's changes

ontology-explorer is a skill published in the GitHub repository HeshamFS/materials-simulation-skills (83 stars, last pushed 4d ago), licensed Apache-2.0. It adds 151 tokens to every session and 3,915 once invoked, about $0.0006 per session on Opus 5.5. 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 2026-08-30.

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