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Ark packages come in five types. The type determines the structure, price range, and what the audit expects to find.
| Type | What it is | Sale model | Price range |
|---|---|---|---|
| skill | A single slash command | One-time | $5 – $29 |
| agent | An autonomous AI agent | One-time | $19 – $79 |
| bundle | A curated set of related skills or agents | One-time | $29 – $149 |
| system | A full workflow with agents, skills, and scripts | One-time or subscription | $99 – $499 |
| os | A complete cognitive operating system | One-time or subscription | $299 – $999+ |
A skill adds one slash command to Claude Code. It's the simplest unit in Ark — a CLAUDE.md file that defines what /your-command does, with an installer that copies it into place.
When to use: a focused, reusable action. Summarize text, format a file, generate a specific output.
my-skill/
├── ark.json
├── CLAUDE.md ← defines /my-command
├── README.md
└── bin/
├── install.sh
└── verify.sh An agent is a more complex, autonomous entity. It can handle multi-step tasks, maintain state between sessions, and coordinate with external tools or APIs.
When to use: tasks requiring reasoning, decision-making, or multiple sequential actions. Research agents, writing agents, monitoring agents.
my-agent/
├── ark.json
├── CLAUDE.md ← agent persona and capabilities
├── README.md
├── config/
│ └── defaults.json
├── prompts/
│ └── system.md
└── bin/
├── install.sh
└── verify.sh A bundle groups related skills and agents that work better together. Buyers get a cohesive toolkit at a discount versus buying individually.
When to use: complementary tools with shared context. A writing bundle with /draft, /edit, /tone-check, and a voice-consistency agent.
A system is an end-to-end workflow: multiple agents, supporting skills, automation scripts, and configuration. It might integrate external services, manage files, and run on a schedule.
When to use: complete domain solutions. A business reporting system, a content pipeline, a personal productivity OS.
Systems can use the subscription sale model for recurring value delivery (regular updates, evolving workflows).
An OS is the largest package type. It's a full cognitive infrastructure: a CLAUDE.md that defines an agent ecosystem with dozens of specialized sub-agents, skills, automated sessions, and a structured daily workflow.
Example: NOESIS (Gino's cognitive OS) — published on Ark as the first OS-type package.
"model": "free" in the sale object. Free packages still require an audit score of 60+ and go through review. They're great for acquisition — drive installs, then offer a paid upgrade.