What is ontology-sync?

A synchronization tool that updates an RDF/Turtle knowledge graph from a Markdown vault. It wraps the vault-conversion process and reports counts of the extracted entities and relationships.

Use it after adding or editing vault notes, before querying the graph, or as part of regular vault maintenance.

It avoids manually rebuilding the graph after notes change. Running it keeps the graph aligned with updated people, projects, meetings, and archive files.

How kubony/claude-knowledge-graph configures Claude Code

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-sync/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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/kubony/claude-knowledge-graph/ontology-sync/github.svg)](https://agentmods.dev/skills/kubony/claude-knowledge-graph/ontology-sync)

Your own site

<a href="https://agentmods.dev/skills/kubony/claude-knowledge-graph/ontology-sync"><img src="https://agentmods.dev/badge/skills/kubony/claude-knowledge-graph/ontology-sync/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/kubony/claude-knowledge-graph/ontology-sync"><img src="https://agentmods.dev/badge/skills/kubony/claude-knowledge-graph/ontology-sync.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 322 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	$0.00020	$0.00322
Opus 5.5	$0.00008	$0.00129
Sonnet 5.5	$0.00004	$0.00064
Haiku 4.5	$0.00002	$0.00032

Measured 2mo ago against content hash 3f299d9cb2db, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ontology-sync 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/sync_vault.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-sync/SKILL.md · 63 lines

What it actually says

Ontology Sync

Sync vault to TTL knowledge graph.

Usage

Basic Sync

source .venv/bin/activate && \
python .claude/skills/ontology-sync/scripts/sync_vault.py

With Options

source .venv/bin/activate && \
python .claude/skills/ontology-sync/scripts/sync_vault.py \
  --vault ./my-vault \
  --output ./knowledge.ttl

Parameters

Parameter	Default	Description
`--vault`	`./vault`	Vault directory
`--output`	`./knowledge.ttl`	Output TTL file
`--persons-dir`	`persons`	Person files folder
`--projects-dir`	`projects`	Project files folder
`--archives-dir`	`archives`	Archives folder

Output

knowledge.ttl - RDF triples in Turtle format

Statistics

After sync, displays:

Person count
Project count
Meeting count
Organization count
Topic count
Total triples

When to Use

After adding new person/project files
After updating meeting records
Before querying the knowledge graph
As part of vault maintenance workflow

Dependencies

ontology-engine skill (vault_to_ttl.py)
rdflib, pyyaml

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.

scripts/sync_vault.py 3.3 KB runs code

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.

2mo ago First seen · 63 lines · 20 tokens per session scan A 3f299d9cb2db

Subscribe to this mod's changes

ontology-sync is a skill published in the GitHub repository kubony/claude-knowledge-graph (48 stars, last pushed 10mo ago), licensed MIT. It adds 20 tokens to every session and 322 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.

Databases

ontology-sync next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ontology-synckubony/claude-knowledge-graph	Skill	48	10mo ago	MIT	A	20	Claude Code
create-prprisma/orm	Skill	48k	yesterday	Apache-2.0	A	48	Claude Code, Codex
schema-explorationlangchain-ai/deepagents	Skill	31k	yesterday	MIT	A	57	Claude Code, Codex
atlas-mssqlariga/atlas	Skill	8.8k	yesterday	Apache-2.0	A	163	Claude Code
ha-data-storesshiwenwen/hope-agent	Skill	1.9k	yesterday	MIT	A	115	Claude Code, Codex
nornicdb-cypher-queriesorneryd/NornicDB	Skill	923	yesterday	MIT	A	79	Claude Code, Codex
volcengine-rds-postgresqlbytedance/agentkit-samples	Skill	484	today	Apache-2.0	A	63	Claude Code, Codex

claude-knowledge-graph: Skill for Claude Code