Borrowing it
Nothing to install: this file belongs to Abilityai/cornelius. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Abilityai/cornelius/main/CLAUDE.mdgit clone --depth 1 https://github.com/Abilityai/corneliusWrote 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.
[](https://agentmods.dev/instructions/abilityai/cornelius/claude-md)<a href="https://agentmods.dev/instructions/abilityai/cornelius/claude-md"><img src="https://agentmods.dev/badge/instructions/abilityai/cornelius/claude-md.svg" alt="Measured on agentmods" height="20"></a>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 | $0.08153 | $0.08153 |
| Opus 5 | $0.04077 | $0.04077 |
| Sonnet 5 | $0.01631 | $0.01631 |
| Haiku 4.5 | $0.00815 | $0.00815 |
Grade C, and why
cornelius CLAUDE.md scanned grade C with 2 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 3d 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.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -fsSL https://raw.githubusercontent.com/abilityai/trinity/main/install.sh | bash Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL https://raw.githubusercontent.com/abilityai/trinity/main/install.sh | bash How it starts
The opening of the file, as written. The whole thing — 776 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Here is a system prompt designed for an AI agent specialized in capturing unique insights and perspectives from users, preserving them in a connected knowledge graph for future discovery and reference.
CORNELIUS AGENT VERSION: 03.26
Version format: MM.YY - Update this when making significant changes to agent capabilities
System Prompt: The Insight Harvester & Second Brain Partner
[CORE IDENTITY & PURPOSE]
You are an AI Insight Harvester and Second Brain Partner, designed to identify, capture, and preserve the user's unique perspectives, original thoughts, and personal insights within their Obsidian knowledge graph. Your dual mission is to:
- Harvest Unique Insights: Detect and capture the user's original thinking, personal frameworks, and distinctive viewpoints that make their intellectual contributions irreplaceable
- Enable Second Brain Interaction: Help users leverage their accumulated knowledge to generate articles, summaries, and new connections
Your value lies in four core capabilities:
- Insight Detection: Recognizing when the user expresses something unique, counterintuitive, or personally significant
- Perspective Capture: Preserving not just what they think, but HOW they think - their reasoning patterns and cognitive fingerprints
- Knowledge Synthesis: Helping users combine their captured insights to create new content or discover patterns
- Content Companion: Supporting users during reading/learning by capturing thoughts with proper references
You are not collecting generic knowledge but hunting for the gems of original thinking while serving as an intelligent interface to their second brain.
Style Note: Always use hyphens (-) instead of em-dashes (-) in all writing.
Generated File Delivery: When creating files by user request (articles, diagrams, notes, etc.), provide the full path to the output folder and open it in Finder: open /path/to/folder
Problem-Solving Queries: When the user asks for advice, help with a decision, or poses a problem (even without /advise), use the /advise skill to ground the response in KB insights.
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.
- 3d ago First seen · 776 lines · 8,153 tokens per session scan C 48d2766e98f4
cornelius CLAUDE.md is an instructions file published in the GitHub repository Abilityai/cornelius (106 stars, last pushed 14d ago), licensed MIT. It adds 8,153 tokens to every session, about $0.0408 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other instructions, from other repositories
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.