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 neo4j-contrib/neo4j-skills --skill neo4j-ontology-skillgit clone --depth 1 https://github.com/neo4j-contrib/neo4j-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/neo4j-contrib/neo4j-skills/neo4j-ontology-skill)<a href="https://agentmods.dev/skills/neo4j-contrib/neo4j-skills/neo4j-ontology-skill"><img src="https://agentmods.dev/badge/skills/neo4j-contrib/neo4j-skills/neo4j-ontology-skill/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/neo4j-contrib/neo4j-skills/neo4j-ontology-skill"><img src="https://agentmods.dev/badge/skills/neo4j-contrib/neo4j-skills/neo4j-ontology-skill.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 | $0.00122 | $0.01872 |
| Opus 5.5 | $0.00049 | $0.00749 |
| Sonnet 5.5 | $0.00024 | $0.00374 |
| Haiku 4.5 | $0.00012 | $0.00187 |
Grade A, and why
neo4j-ontology-skill 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 5d 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.
How it starts
The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
When to Use
- Authoring an ontology document (Neo4j Ontology Graph Specification) from a domain description
- Editing existing ontology YAML/JSON: nodes, relationships, properties, types, constraints, cardinality, extensions
- Validating an ontology document against the spec schema
When NOT to Use
- Cypher queries, or loading/applying an ontology into a database →
neo4j-cypher-skill(ontology Cypher procedures do not exist yet — later work there) - Generic graph modeling advice (node vs property vs label, anti-patterns, supernodes) →
neo4j-modeling-skill
Authoring Workflow
Step 1 — Gather domain intent
Identify what is being modeled: entity types (nodes), connections (relationships + direction), properties per element, identifying keys, mandatory fields, cardinality. If the domain or required shape is unclear, ask the user what is being modeled and which questions the ontology must answer. Do NOT guess a domain.
Step 2 — Draft the document
YAML or JSON per user preference; default YAML (more readable). Apply the Core Facts below. Load references/format-reference.md when anything beyond the minimal example is needed (full labels object, constraint objects, extensions, full data-type grammar).
Step 3 — Validate
# From the skill directory:
uv run scripts/validate.py <document.{yaml,yml,json}>
# From the repo root:
uv run neo4j-ontology-skill/scripts/validate.py <document.{yaml,yml,json}>
Exit 0 = valid · exit 1 = schema violations (one line per field path) · exit 2 = parse/read/fetch error. PEP 723 script — uv resolves deps (jsonschema, pyyaml) itself.
The validator fetches the schema live — nothing is vendored. Resolution order: --schema <path-or-url> (explicit, no fallback) → the document's own schema field when it is a URL → the published current alias → transitional repo raw fallback. The document's schema URL decides which version it validates against: set it to the published versioned URL of the version being authored (older versions validate against their published schema).
What ships with it
3 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.
- 5d ago First seen · 124 lines · 122 tokens per session scan A 6ac2caea6a39
neo4j-ontology-skill is a skill published in the GitHub repository neo4j-contrib/neo4j-skills (116 stars, last pushed yesterday), licensed MIT. It adds 122 tokens to every session and 1,872 once invoked, about $0.0005 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 2026-10-22.
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