> For the complete documentation index, see [llms.txt](https://docs.questflow.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.questflow.ai/financial-harness/what-is-an-investor-skill.md).

# What Is an Investor Skill?

**Short answer:** An Investor Skill is a portable judgment system for an AI finance agent — one package that tells the agent when to use a named investor’s process, what to watch, what to reject, how to size, and what invalidates the view. They run inside Questflow’s financial harness and in Codex, Claude, Cursor, or OpenCode. Catalog: [questflowai/investorskills](https://github.com/questflowai/investorskills).

## Package shape

```
skills/livermore/
├── SKILL.md     # when to use, inputs, process, output, guardrails
└── invest.md    # optional schema: signals, filters, sizing, risk
```

`SKILL.md` is the agent entry point. `invest.md` is the structured investment system when the model is large enough to split.

## What it is not

Not a stock tip. Not a prompt that “generates a strategy.” Not the model and not the execution venue. It is the methodology pillar of the financial harness.

## Two layers

* **Open-source skills** — public judgment systems (Buffett, Livermore, Druckenmiller, Ansem, 段永平, …)
* **Questflow exclusive skills** — closed-source, labeled from real fund-manager trades; paid product

Related: What is SKILL.md? · What is an investment schema? · Skills catalog

*Nothing here is financial advice.*