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claude-knowledge-graph: Skill for Claude Code

.claude/skills/ontology-engine/SKILL.md

ontology-engine is a skill for Claude Code from kubony/claude-knowledge-graph. It costs 26 tokens per session (911 once invoked), scanned A, original, MIT.

A tool that converts a Markdown note vault into an RDF/Turtle knowledge graph, a structured file of facts and links. It extracts people, projects, meetings, organizations, topics, and relationships from folders, headings, filenames, tags, and wiki links.

In plain words
What is it for?
Use it to create a knowledge.ttl file from a vault, customize the source folders, and extract structured details from Markdown files.
Why use it?
It turns loosely organized notes into data that can be searched and connected. This makes information such as project involvement or meeting relationships easier to analyze.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: reads .claude/ paths.

This is kubony/claude-knowledge-graph's own configuration. It tells Claude Code how to work on claude-knowledge-graph itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything claude-knowledge-graph configures →

not rated 48repo 10mo ago A scan 26 tokens original MIT
View source ↗ kubony/claude-knowledge-graph
Reuse

Borrowing it

Nothing to install: this file belongs to kubony/claude-knowledge-graph. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/kubony/claude-knowledge-graph/main/.claude/skills/ontology-engine/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/kubony/claude-knowledge-graph

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 ontology-engine

README.md
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Your own site
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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 ontology-engine

Your own site · 80×15
<a href="https://agentmods.dev/skills/kubony/claude-knowledge-graph/ontology-engine"><img src="https://agentmods.dev/badge/skills/kubony/claude-knowledge-graph/ontology-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 911 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00026 $0.00911
Opus 5.5 $0.00010 $0.00364
Sonnet 5.5 $0.00005 $0.00182
Haiku 4.5 $0.00003 $0.00091

Measured 2mo ago against content hash c2743d945fae, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ontology-engine 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/vault_to_ttl.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.

.claude/skills/ontology-engine/SKILL.md · 140 lines

How it starts

The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ontology Engine

Convert markdown vault to RDF/TTL ontology for semantic querying.

Usage

Build Knowledge Graph

source .venv/bin/activate && \
python .claude/skills/ontology-engine/scripts/vault_to_ttl.py ./vault --output ./knowledge.ttl

With Custom Folders

source .venv/bin/activate && \
python .claude/skills/ontology-engine/scripts/vault_to_ttl.py ./vault \
  --persons-dir contacts \
  --projects-dir work \
  --output ./knowledge.ttl

Parameters

Parameter Default Description
vault_path Required Root vault directory
--output knowledge.ttl Output TTL file
--persons-dir persons Person files folder
--projects-dir projects Project files folder
--archives-dir archives Archived projects folder

Extraction Rules

Person Files

Location: {vault}/{persons-dir}/*.md

Filename Pattern: Name_Organization.md

Extracted Fields:

  • Name (from YAML title or filename)
  • Organization (from filename suffix)
  • Tags (from YAML tags)
  • Summary (from YAML summary)
  • Contact info (from YAML contact)
  • Last contact date (from YAML last_contact)

Project Files

Location: {vault}/{projects-dir}/*/, {vault}/{archives-dir}/*/

Folder Pattern: YYMM ProjectName or YYMMDD ProjectName

Extracted Fields:

  • Project name
  • Start date (from folder name)
  • Tags
  • Summary
  • Status (active/archived)

Meetings

Pattern: ## YYYY.MM.DD or ## YYYY-MM-DD headings

Extracted Fields:

  • Date
  • Summary (content under heading)
  • Topics (hashtags in content)
  • Participants (from [[wikilinks]])

Relationships

From [[Wikilinks]]:

  • Person → Person: :knows
  • Person → Project: :involvedIn
  • Meeting → Person: :participant
  • Meeting → Project: :relatedTo

Output Schema

Classes

Class Description
:Person Individual person
:Project Project or initiative
:Meeting Meeting, call, or interaction
:Organization Company or group
:Topic Discussion topic

Read the full file on GitHub · 140 lines

Files

What ships with it

1 file 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.

  1. 2mo ago First seen · 140 lines · 26 tokens per session scan A c2743d945fae

Subscribe to this mod's changes

ontology-engine is a skill published in the GitHub repository kubony/claude-knowledge-graph (48 stars, last pushed 10mo ago), licensed MIT. It adds 26 tokens to every session and 911 once invoked, about $0.0001 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.

Data and AI
Related

ontology-engine compared with skills from other repositories

ontology-engine next to 6 skills from other repositories
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