> ## Documentation Index
> Fetch the complete documentation index at: https://docs.geval.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Example — Safety-focused gate

> Block risky releases when hallucination or retrieval metrics cross thresholds.

This example mirrors the **safety-and-blocking** style policy from **`geval init`**: hard **BLOCK** rules when model or retrieval quality crosses a line.

## Signals

Your pipeline should emit metrics such as:

* `hallucination_rate` (on `component: generator`)
* `context_relevance` (on `component: retrieval`)

## Policy idea

* **Priority 1** — If hallucination rate exceeds a ceiling → **BLOCK** with a clear reason.
* **Priority 2** — If retrieval relevance falls below a floor → **BLOCK**.

## Contract

List the policy file(s) in **`contract.yaml`**:

```yaml theme={null}
name: release-gate
version: "1.0.0"
policies:
  - path: policies/safety-and-blocking.yaml
```

## Run

```bash theme={null}
geval validate-contract contract.yaml
geval check --contract contract.yaml --signals signals.json
```

## Next

[Policy rules](/configuration/policy-rules) · [geval init](/cli/init)