# Ontoskills

> OWL 2 skill compiler for deterministic AI agents — transforms SKILL.md into validated RDF/ Turtle ontologies with SHACL gatekeeper

- **Type:** MCP server
- **Install:** `agentstack add mcp-mareasw-ontoskills`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [mareasw](https://agentstack.voostack.com/s/mareasw)
- **Installs:** 0
- **Category:** [Developer Tools](https://agentstack.voostack.com/c/developer-tools)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [mareasw](https://github.com/mareasw)
- **Source:** https://github.com/mareasw/ontoskills
- **Website:** https://ontoskills.sh

## Install

```sh
agentstack add mcp-mareasw-ontoskills
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

OntoSkills
  

  🇬🇧 English • 🇨🇳 中文

  The deterministic enterprise AI agent platform.

  Neuro-symbolic architecture for the Agentic Web — OntoCore • OntoMCP • OntoStore

  Overview •
  Getting Started •
  Roadmap •
  Philosophy

  
  
  
  
  
    
  

---

## What is OntoSkills?

OntoSkills transforms natural language skill definitions into **validated OWL 2 ontologies** — queryable knowledge graphs that enable deterministic reasoning for AI agents.

**The problem:** LLMs read skills probabilistically. Same query, different results. Long skill files burn tokens and confuse smaller models.

**The solution:** Compile skills to ontologies. Query with SPARQL. Get exact answers, every time.

```mermaid
flowchart LR
    CORE["OntoCore━━━━━━━━━━SKILL.md → .ttlLLM + SHACL"] -->|"compiles"| CENTER["OntoSkills━━━━━━━━━━OWL 2 Ontologies.ttl artifacts"]
    CENTER -->|"loads"| MCP["OntoMCP━━━━━━━━━━Rust SPARQLin-memory graph"]
    MCP |"queries"| AGENT["AI Agent━━━━━━━━━━Deterministicreasoning"]

    style CORE fill:#e91e63,stroke:#2a2a3e,color:#f0f0f5
    style CENTER fill:#abf9cc,stroke:#2a2a3e,color:#0d0d14
    style MCP fill:#92eff4,stroke:#2a2a3e,color:#0d0d14
    style AGENT fill:#6dc9ee,stroke:#2a2a3e,color:#0d0d14
```

---

## Why OntoSkills?

| Problem | Solution |
|---------|----------|
| LLMs interpret text differently each time | SPARQL returns exact answers |
| 50+ skill files = context overflow | Query only what's needed |
| No verifiable structure for relationships | OWL 2 formal semantics |
| Small models can't read complex skills | Democratized intelligence via graph queries |

**For 100 skills:** ~500KB text scan → ~1KB query

[→ Read the full philosophy](PHILOSOPHY.md)

---

## Quick Start

```bash
# Install the MCP runtime and bootstrap your client
npx ontoskills install mcp --claude

# Or install the Python compiler separately
pip install ontocore
ontocore compile
```

[→ Full installation guide](https://ontoskills.sh/docs/getting-started/)

---

## Components

| Component | Language | Description |
|-----------|----------|-------------|
| **OntoCore** | Python | Neuro-symbolic compiler: SKILL.md → OWL 2 ontology |
| **OntoMCP** | Rust | MCP server with sub-ms SPARQL queries |
| **OntoStore** | GitHub | Versioned skill registry |
| **CLI** | Node.js | One-command installer (`npx ontoskills`) |

---

## Documentation

- **[Overview](https://ontoskills.sh/docs/overview/)** — What is OntoSkills and why it matters
- **[Getting Started](https://ontoskills.sh/docs/getting-started/)** — Installation and first steps
- **[Architecture](https://ontoskills.sh/docs/architecture/)** — How the system works
- **[Knowledge Extraction](https://ontoskills.sh/docs/knowledge-extraction/)** — Extracting value from skills
- **[OntoStore](https://ontoskills.sh/ontostore/)** — Browse and install skills
- **[Roadmap](https://ontoskills.sh/docs/roadmap/)** — Development phases

---

## License

MIT License — see [LICENSE](LICENSE) for details.

*© 2026 [MareaSW](https://ontoskills.sh)*

## Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [mareasw](https://github.com/mareasw)
- **Source:** [mareasw/ontoskills](https://github.com/mareasw/ontoskills)
- **License:** MIT
- **Homepage:** https://ontoskills.sh

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/mcp-mareasw-ontoskills
- Seller: https://agentstack.voostack.com/s/mareasw
- Browse the marketplace: https://agentstack.voostack.com/browse

---
Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.