# Palantir Ontology

> Apply the Palantir Foundry Ontology model to ontology-brain. Use for schema decisions, object type choices, typed links, property placement, normalization, source modeling, or ontology health reviews.

- Skill: `rudironsoni/palantir-ontology` (Agent Skill, multi-file: 8 files)
- Install (CLI): `npx skillmds@latest add rudironsoni/palantir-ontology`
- Raw SKILL.md: https://api.skillmd.com/api/skills/rudironsoni/palantir-ontology/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: rudironsoni (https://skillmd.com/u/rudironsoni)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/rudironsoni/palantir-ontology

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# Palantir Ontology for Markdown

This skill explains the ontology lens used by `ontology-brain/`. Read `ontology.md` for the local schema. Use the references in this skill for the general model.

## Model

Palantir's Ontology describes a semantic layer over real-world operations. In this Markdown brain:

| Palantir concept | Markdown adaptation |
|---|---|
| Object type | folder under `objects/` |
| Object | Markdown page |
| Property | frontmatter key |
| Link type | typed frontmatter list |
| Action type | `log.md` operation |
| Function | reusable `concepts/` page |
| Integrated source | `sources/` page |

## Decision Guides

### Property, Link, or Object

- Use a property when the value has no independent identity.
- Use a typed link when the target has its own page.
- Create a new object when the thing has identity, facts, and future references.

### Object Type

Use concrete nouns from the domain. Avoid generic types unless the domain itself uses them. Create a folder only when the first page exists.

### Link Type

Use the smallest vocabulary that preserves meaning. Add a new link type only when the relationship recurs, reads naturally in both directions, and `relates_to` loses important information.

### Object-Backed Relationship

When a relationship has its own metadata, such as dates, roles, status, or evidence, promote the relationship to a page and link both ends to it.

## Anti-Patterns

- Storing the same fact on multiple pages.
- Copying source-owned status into several pages.
- Creating object types before any object exists.
- Linking pages only because they share a keyword.
- Using vague names where domain nouns are available.
- Hand-maintained counts that can be derived from links.

## References

- `references/overview.md`
- `references/core-concepts.md`
- `references/why-ontology.md`
- `references/ontology-structural-guidance.md`
- `references/ontology-best-practices.md`
- `references/ontology-anti-patterns.md`
- `references/derived-properties.md`