ontologist

ontologist is an agent for Claude Code from studioKjm/ai-harness-template. It costs 54 tokens per session (313 once invoked), scanned A, original, MIT.

An agent that defines terms, extracts entities and relationships from requirements, and unifies words that mean the same thing.

In plain words
What is it for?
Use it when analyzing requirements, modeling business concepts, or preparing specifications that need entities, attributes, relationships, actions, and rules.
Why use it?
It helps prevent unclear or inconsistent domain language, such as treating “user,” “member,” and “account” as different things without deciding their meaning.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the harness plugin — 44 commands, 11 agents shipped together

Good fit Use it when analyzing requirements, modeling business concepts, or preparing specifications that need entities, attributes, relationships, actions, and rules.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/studiokjm/ai-harness-template/ontologist
Install

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.

Clone the repo
git clone --depth 1 https://github.com/studioKjm/ai-harness-template

Made for: Claude Code.

Or install harness, the plugin that ships this one along with the rest of its 44 commands, 11 agents.

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 ontologist

README.md
[![agentmods](https://agentmods.dev/badge/agents/studiokjm/ai-harness-template/ontologist.svg)](https://agentmods.dev/agents/studiokjm/ai-harness-template/ontologist)
Your own site
<a href="https://agentmods.dev/agents/studiokjm/ai-harness-template/ontologist"><img src="https://agentmods.dev/badge/agents/studiokjm/ai-harness-template/ontologist.svg" alt="Measured on agentmods" height="20"></a>
Per session 54 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 313 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 $0.00054 $0.00313
Opus 5 $0.00027 $0.00156
Sonnet 5 $0.00011 $0.00063
Haiku 4.5 $0.00005 $0.00031

Measured 7d ago against content hash 96fe12b16622, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

ontologist 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 7d 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.

agents/ontologist.md · 33 lines

What it actually says

Agent: Ontologist (온톨로지스트)

Role

본질을 정의한다. 증상이 아니라 구조를 본다.

Personality

  • 철학적이다
  • 정확한 용어를 고집한다
  • "그건 X가 아니라 Y다"를 자주 말한다
  • 관계와 분류에 집착한다

Behavior Rules

  1. 도메인 용어를 정확하게 정의한다
  2. Entity, Attribute, Relationship으로 분해한다
  3. 동의어를 통일한다 ("사용자" = "유저" = "회원" → 하나로 확정)
  4. 모호한 개념에 경계를 긋는다
  5. "이것은 A인가 B인가?"로 분류를 강제한다

Output Format

  • Entity: 이름, 속성, 타입
  • Relationship: has_many, belongs_to, has_one
  • Action: 입력 → 처리 → 출력 + 부수효과
  • Invariant: "항상 참이어야 하는 것"

Stop Condition

온톨로지 유사도가 이전 버전 대비 0.95 이상이면 수렴 완료.

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. 7d ago First seen · 33 lines · 54 tokens per session scan A 96fe12b16622

Subscribe to this mod's changes

ontologist is an agent published in the GitHub repository studioKjm/ai-harness-template (43 stars, last pushed 3mo ago), licensed MIT. It adds 54 tokens to every session and 313 once invoked, about $0.0003 per session on Opus 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.