---
sidebar_label: engine
---

# alpha.dagger.io/dagger/engine

```cue
import "alpha.dagger.io/dagger/engine"
```

## engine.#Context

### engine.#Context Inputs

_No input._

### engine.#Context Outputs

_No output._

## engine.#FS

A reference to a filesystem tree. For example:  - The root filesystem of a container  - A source code repository  - A directory containing binary artifacts Rule of thumb: if it fits in a tar archive, it fits in a #FS.

### engine.#FS Inputs

_No input._

### engine.#FS Outputs

_No output._

## engine.#Plan

A deployment plan executed by `dagger up`

### engine.#Plan Inputs

_No input._

### engine.#Plan Outputs

_No output._

## engine.#Secret

A reference to an external secret, for example:  - A password  - A SSH private key  - An API token Secrets are never merged in the Cue tree. They can only be used by a special filesystem mount designed to minimize leak risk.

### engine.#Secret Inputs

_No input._

### engine.#Secret Outputs

_No output._

## engine.#Service

A reference to a network service endpoint, for example:  - A TCP or UDP port  - A unix or npipe socket  - An HTTPS endpoint

### engine.#Service Inputs

_No input._

### engine.#Service Outputs

_No output._