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dagger/docs/core-concepts/1213-dagger-cue.md
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---
slug: /1213/api
displayed_sidebar: '0.2'
---
# Dagger CUE API
As of Dagger 0.2, the Dagger CUE API can be imported via `dagger.io/dagger` & `dagger.io/dagger/core`
The Dagger CUE API is the set of CUE packages released alongside the Dagger engine.
Developers of other Dagger packages are expected to build on top of these core packages.
### Plan definition
`#Plan` defines the structure of a Dagger plan - a complete configuration executable by `dagger do`
| Definition | File | Description |
| :--------- | :------------------------------------------------------------------------------------- | :--------------------------------------------------- |
| `#Plan` | [plan.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/plan.cue) | A special kind of program which `dagger` can execute |
### Core types
Dagger extends the CUE type system with the following core types:
| Definition | File | Description |
| :------------- | :------------------------------------------------------------------------------------------ | :---------------------------------------------------- |
| `#Address` | [types.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/types.cue) | Network service address |
| `#CacheDir` | [exec.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/exec.cue) | A (best effort) persistent cache dir |
| `#FS` | [types.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/types.cue) | Reference to a filesystem tree |
| `#HealthCheck` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/image.cue) | Container health check |
| `#ImageConfig` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/image.cue) | Container image config |
| `#Mount` | [exec.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/exec.cue) | Transient filesystem mount |
| `#Ref` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/image.cue) | An address for a remote container image |
| `#Scratch` | [types.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/types.cue) | An empty directory |
| `#Secret` | [types.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/types.cue) | Secure reference to an external secret |
| `#Socket` | [types.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/types.cue) | Reference to a network socket: unix, tcp/udp or npipe |
| `#TempDir` | [exec.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/exec.cue) | A temporary directory for command execution |
### Core actions
Dagger works by executing actions in a certain order and passing data between actions in a certain layout.
Developers can combine actions into higher-level actions, which in turn can be combined into even higher-level actions,
and so on at arbitrary levels of depth. At the bottom of this abstraction stack are _core actions_: these
are implemented by Dagger itself, and are always available.
The following core actions are available:
| Definition | File | Description |
| :-------------- | :------------------------------------------------------------------------------------------------ | :-------------------------------------------------------------------- |
| `#Copy` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Copy files between two filesystem trees |
| `#DecodeSecret` | [secrets.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/secrets.cue) | Decode a secret without leaking its contents |
| `#Diff` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Extract the difference between two filesystems as its own file system |
| `#Dockerfile` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Build a container image using a Dockerfile |
| `#Exec` | [exec.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/exec.cue) | Execute a command in a docker-compatible container |
| `#Export` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Export an image as a tar archive |
| `#GitPull` | [git.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/git.cue) | Download a repository from a remote git server |
| `#HTTPFetch` | [http.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/http.cue) | Get a file from an HTTP server |
| `#Merge` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Merge multiple filesystem trees |
| `#Mkdir` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Create a directory in a filesystem tree |
| `#NewSecret` | [secrets.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/secrets.cue) | Create a new a secret from a filesystem tree |
| `#Pull` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Download an image from a docker registry |
| `#Push` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Upload an image to a docker registry |
| `#ReadFile` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Read a file from a filesystem tree |
| `#Scratch` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Create an empty filesystem tree |
| `#Set` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Modify a docker image |
| `#Source` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Access the source for the current CUE package |
| `#Subdir` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Read a subdirectory from a filesystem tree |
| `#TrimSecret` | [secrets.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/secrets.cue) | Trim leading and trailing space characters from a secret |
| `#WriteFile` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Write a file to a filesystem tree |