by oritera
A AI general-purpose state-space search engine, validated first on autonomous penetration testing.
# Add to your Claude Code skills
git clone https://github.com/oritera/CairnLast scanned: 5/7/2026
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}Cairn is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by oritera. A AI general-purpose state-space search engine, validated first on autonomous penetration testing. It has 1,968 GitHub stars.
Yes. Cairn passed SkillsLLM's automated security scan — a dependency vulnerability audit plus prompt-injection heuristics — with no high-severity issues. You can read the full report in the Security Report section on this page.
Clone the repository with "git clone https://github.com/oritera/Cairn" and add it to your Claude Code skills directory (see the Installation section above).
Cairn is primarily written in Python. It is open-source under oritera on GitHub, so you can review or fork the full source.
Yes. SkillsLLM lists many other AI Agents skills you can browse and compare side by side. Open the AI Agents category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh Cairn against similar tools.
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Cairn is a general-purpose problem-solving engine. It defines no roles, no workflows. Given an origin and a goal, it searches for a path through an unknown state space. AI Penetration Testing is one such problem — and a proven one.
Penetration testing is fundamentally a directed search through a near-infinite state space:
This structure is not unique to penetration testing. Vulnerability research, mathematical proof, CTF challenges — any problem with a clear starting point, a clear success condition, and an unknown path in between shares the same shape.
Cairn is built for this class of problems. Penetration testing is the first domain it has been validated on.
The engine is built on a Blackboard Architecture with an explicit fact-intent graph. Three primitives are all it needs:
| Concept | Meaning |
|---|---|
| Fact | A confirmed, objective finding written to the board |
| Intent | A declared direction of exploration, not yet executed |
| Hint | Human judgment injected at any time; absorbed by agents on the next read |
The graph grows from origin toward goal. Every new Fact is a stepping stone; every Intent is a step into the unknown.
Agent Workers run an OODA loop — Observe the full graph, Orient to the current state, Decide on next intents, Act to explore — and write their findings back as new Facts. Workers have no fixed roles. Tasks are generated at runtime from the graph's current state, not from predefined job descriptions.
Agents coordinate exclusively through the shared board (Stigmergy). No direct communication. No information silos.
https://github.com/user-attachments/assets/e557b1ac-dda4-41cb-87dd-9d56dbf05133
Three task types, all executed by the same Worker:
| Task | What it does | Output |
|---|---|---|
| Bootstrap | At project start, attempts to solve the problem directly | Fact + possible Complete |
| Reason | Reads the full graph: is the goal met? What should be explored next? | Complete / new Intents / no-op |
| Explore | Claims one Intent, executes the exploration, reports findings | One Fact |
System architecture:
┌──────────────────────────────────┐
│ Cairn Server │
│ Facts + Intents + Hints │
└─────────────────┬────────────────┘
│
Read / Write API
│
┌─────────────────┴────────────────┐
│ Dispatcher │
│ Schedules tasks, manages │
│ containers, writes protocol │
└──────────┬───────────────┬───────┘
│ │
┌───────────────┴──┐ ┌──────┴──────────────┐
│ Worker Container│ │ Worker Container │
│ (Project A) │ │ (Project B) │
│ ┌────┐ ┌────┐ │ │ ┌────┐ ┌────┐ │
│ │ W. │ │ W. │ │ │ │ W. │ │ W. │ │
│ └────┘ └────┘ │ │ └────┘ └────┘ │
└──────────────────┘ └─────────────────────┘
Cairn Server maintains graph consistency only.
Cairn Dispatcher reads the graph, schedules tasks, spins up and tears down worker containers, and is the sole writer to the protocol. Each project gets its own Worker Container; multiple Agent Workers run concurrently inside it. Agent Workers only receive a prompt and return structured output.
Supported worker backends: Claude Code, Codex, and Pi.
Tencent Cloud Hackathon · AI Penetration Testing Challenge · 2nd Edition
610 teams · 1,345 participants · top universities and security firms across China
| Metric | Value |
|---|---|
| Problems solved | 54 / 54 — only team to AK |
| Final ranking | 3rd |
The system had never been tested before the competition. The full pipeline came online for the first time at 4 AM on race day. No training, no tuning, no domain-specific tooling. Zero MCP tools, zero RAG, zero predefined agent roles.
Prerequisites
Both setup methods require the worker container image:
docker pull --platform=linux/amd64 ghcr.io/oritera/cairn-worker-container:latest
Create your local dispatcher configuration and fill in your LLM endpoints and API keys:
cp dispatch.example.yaml dispatch.yaml
Pull the base image used to build Cairn:
docker pull ghcr.io/astral-sh/uv:python3.13-trixie
docker compose up --build
This starts cairn-server on port 8000 and cairn-dispatcher once the server passes its health check. The dispatcher mounts dispatch.yaml from the project root and connects to Docker via the host socket. Data is persisted to ./datas/cairn/.
# Start the server
uv run --project cairn cairn serve
# Run the dispatcher
uv run --project cairn cairn dispatch --config dispatch.yaml
# Run startup health checks only
uv run --project cairn cairn dispatch --config dispatch.yaml --startup-healthcheck-only
Run the fast regression suite without Docker or live model endpoints:
uv run --project cairn --group dev pytest
Cairn is a general-purpose problem-solving engine. Although it supports penetration testing, CTF solving, security assessment, and vulnerability research workflows, it is intended to be used only in environments where you have explicit authorization to operate.
You are solely responsible for how you use this project. Do not use Cairn against systems, networks, applications, or data without clear prior permission from the owner or operator. Unauthorized security testing, exploitation, or data access may be illegal and may cause harm.
The developers and contributors of this project do not endorse or accept responsibility for any misuse, abuse, damage, loss, or legal consequences arising from its use. By using this project, you agree to ensure that your activities comply with all applicable laws, regulations, contractual obligations, and professional or organizational policies in your jurisdiction.
This project is licensed under GNU AGPLv3 for personal and educational use.
Commercial Use: If you wish to use this project in a commercial or proprietary environment without the AGPL-3.0 open-source obligations, please contact me to obtain a commercial license.
Contributions: By submitting a Pull Request, you agree that your contributions may be used under both the AGPL-3.0 and the project's commercial license.