# Heldout

> Held-out workflow guidance fixture.

- **Type:** Skill
- **Install:** `agentstack add skill-advancingtitans-agent-engineering-toolkit-heldout`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [AdvancingTitans](https://agentstack.voostack.com/s/advancingtitans)
- **Installs:** 0
- **Category:** [Developer Tools](https://agentstack.voostack.com/c/developer-tools)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [AdvancingTitans](https://github.com/AdvancingTitans)
- **Source:** https://github.com/AdvancingTitans/agent-engineering-toolkit/tree/main/tests/fixtures/audit-evolution/heldout-skill-no-verification/skills/heldout

## Install

```sh
agentstack add skill-advancingtitans-agent-engineering-toolkit-heldout
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

Follow the release procedure carefully.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [AdvancingTitans](https://github.com/AdvancingTitans)
- **Source:** [AdvancingTitans/agent-engineering-toolkit](https://github.com/AdvancingTitans/agent-engineering-toolkit)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-advancingtitans-agent-engineering-toolkit-heldout
- Seller: https://agentstack.voostack.com/s/advancingtitans
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.