> 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-are-signals.md).

# What Are Signals?

**Short answer:** Signals are what an Investor Skill watches and how much each one counts. In `invest.md` they are weighted tokens (`high` / `medium` / `low`) with optional direction, threshold, frequency, and source. They are inputs to judgment — not automatic buy orders.

## Anatomy

```yaml
signals:
  fundamental:
    roic:
      weight: high
      frequency: annual
      direction: higher-is-better
      threshold: "> 15%"
```

A Buffett-style skill weights owner earnings and ROIC. A Livermore skill weights breakout confirmation and volume. A Willy Woo skill weights on-chain holder behavior. The plugin layer is how those numbers actually arrive.

## Signal vs filter vs execution

* **Signal** — evidence that updates conviction
* **Filter** — binary gate
* **Execution** — only after thesis + limits

Related: Investment schema · Signal → Thesis → Execution

*Nothing here is financial advice.*